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solution/3000-3099/3001.Minimum Moves to Capture The Queen/images/ex2.png |
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solution/2800-2899/2812.Find the Safest Path in a Grid/images/example3.png |
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solution/1200-1299/1226.The Dining Philosophers/images/an_illustration_of_the_dining_philosophers_problem.png |
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lcp/LCP 70. 沙地治理/images/1662692503-ncjywh-image.png |
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solution/2800-2899/2812.Find the Safest Path in a Grid/images/example2.png |
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solution/1600-1699/1666.Change the Root of a Binary Tree/images/bt_image_1.png |
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solution/1600-1699/1666.Change the Root of a Binary Tree/images/1727138189-YtDgTf-image.png |
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solution/2800-2899/2812.Find the Safest Path in a Grid/images/example1.png |
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lcp/LCP 70. 沙地治理/images/1662692507-mgFXRj-image.png |
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solution/0300-0399/0314.Binary Tree Vertical Order Traversal/images/image2.png |
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lcof2/剑指 Offer II 105. 岛屿的最大面积/images/1626667010-nSGPXz-image.png |
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solution/3200-3299/3274.Check if Two Chessboard Squares Have the Same Color/images/screenshot-2021年02月20日-at-22159-pm.png |
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solution/1800-1899/1812.Determine Color of a Chessboard Square/images/screenshot-2021年02月20日-at-22159-pm.png |
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solution/1800-1899/1812.Determine Color of a Chessboard Square/images/chessboard.png |
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solution/1700-1799/1727.Largest Submatrix With Rearrangements/images/screenshot-2020年12月30日-at-40536-pm.png |
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lcp/LCP 75. 传送卷轴/images/1681714693-LsxKAh-image.png |
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solution/0400-0499/0427.Construct Quad Tree/images/e2tree.png |
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solution/1700-1799/1751.Maximum Number of Events That Can Be Attended II/images/screenshot-2021年01月11日-at-60048-pm.png |
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solution/1400-1499/1444.Number of Ways of Cutting a Pizza/images/ways_to_cut_apple_1.png |
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solution/1700-1799/1727.Largest Submatrix With Rearrangements/images/screenshot-2020年12月30日-at-40852-pm.png |
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solution/0400-0499/0489.Robot Room Cleaner/images/1695782910-iCEGqJ-image.png |
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solution/0500-0599/0558.Logical OR of Two Binary Grids Represented as Quad-Trees/images/qt2.png |
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solution/0300-0399/0314.Binary Tree Vertical Order Traversal/images/image1.png |
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solution/0300-0399/0314.Binary Tree Vertical Order Traversal/images/1727276130-UOKFsu-image.png |
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solution/1200-1299/1263.Minimum Moves to Move a Box to Their Target Location/images/sample_1_1620.png |
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solution/0300-0399/0314.Binary Tree Vertical Order Traversal/images/image3.png |
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lcp/LCP 75. 传送卷轴/images/1681714676-gksEMT-image.png |
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solution/1200-1299/1279.Traffic Light Controlled Intersection/images/exp.png |
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solution/3100-3199/3100.Water Bottles II/images/example231.png |
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solution/3100-3199/3100.Water Bottles II/images/exampleone1.png |
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solution/3200-3299/3203.Find Minimum Diameter After Merging Two Trees/images/example211.png |
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lcp/LCP 65. 舒适的湿度/images/1663902759-dgDCxn-image.png |
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lcp/LCP 75. 传送卷轴/images/1681800985-KrSdru-image.png |
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solution/0000-0099/0038.Count and Say/images/1629874763-TGmKUh-image.png |
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solution/0500-0599/0558.Logical OR of Two Binary Grids Represented as Quad-Trees/images/qt1.png |
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solution/0900-0999/0909.Snakes and Ladders/images/snakes.png |
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solution/0600-0699/0690.Employee Importance/images/1716170448-dKZffb-image.png |
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solution/0500-0599/0572.Subtree of Another Tree/images/1724998676-cATjhe-image.png |
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solution/0700-0799/0723.Candy Crush/images/candy_crush_example_2.png |
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solution/2400-2499/2481.Minimum Cuts to Divide a Circle/images/alldrawio.png |
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solution/2000-2099/2013.Detect Squares/images/image.png |
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solution/2000-2099/2039.The Time When the Network Becomes Idle/images/quiet-place-example1.png |
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lcp/LCP 43. 十字路口的交通/images/1630393755-gyPeMM-图片.png |
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solution/0400-0499/0427.Construct Quad Tree/images/e1tree.png |
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solution/1300-1399/1344.Angle Between Hands of a Clock/images/sample_2_1673.png |
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lcp/LCP 71. 集水器/images/1664436082-SibVMv-image.png |
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solution/0500-0599/0558.Logical OR of Two Binary Grids Represented as Quad-Trees/images/qtr.png |
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solution/1800-1899/1828.Queries on Number of Points Inside a Circle/images/chrome_2021年03月25日_22-42-07.png |
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solution/2200-2299/2249.Count Lattice Points Inside a Circle/images/exa-22.png |
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solution/0800-0899/0882.Reachable Nodes In Subdivided Graph/images/origfinal.png |
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solution/1500-1599/1518.Water Bottles/images/sample_2_1875.png |
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solution/0900-0999/0952.Largest Component Size by Common Factor/images/ex3.png |
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solution/2100-2199/2103.Rings and Rods/images/ex1final.png |
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solution/1700-1799/1724.Checking Existence of Edge Length Limited Paths II/images/messed.png |
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lcp/LCP 38. 守卫城堡/images/1614828208-oFlpVs-image.png |
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solution/0500-0599/0533.Lonely Pixel II/images/1694957797-UWXAxl-image.png |
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solution/2400-2499/2463.Minimum Total Distance Traveled/images/1667542978-utuiPv-image.png |
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solution/0900-0999/0931.Minimum Falling Path Sum/images/1729566253-aneDag-image.png |
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solution/2100-2199/2103.Rings and Rods/images/ex2final.png |
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lcp/LCP 52. 二叉搜索树染色/images/1649833763-BljEbP-image.png |
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solution/0100-0199/0130.Surrounded Regions/images/1718167191-XNjUTG-image.png |
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lcp/LCP 54. 夺回据点/images/1648706944-KJstUN-image.png |
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solution/1400-1499/1485.Clone Binary Tree With Random Pointer/images/e3.png |
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solution/0500-0599/0587.Erect the Fence/images/erect_the_fence_1.png |
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solution/1700-1799/1728.Cat and Mouse II/images/sample_111_1955.png |
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solution/0800-0899/0858.Mirror Reflection/images/reflection.png |
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lcp/LCP 62. 交通枢纽/images/1663902595-McsEkY-image.png |
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solution/2200-2299/2212.Maximum Points in an Archery Competition/images/1647744785-cMHzaC-image.png |
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solution/2200-2299/2212.Maximum Points in an Archery Competition/images/1647744752-kQKrXw-image.png |
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lcp/LCP 75. 传送卷轴/images/1681789509-wTekFu-image.png |
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solution/0500-0599/0588.Design In-Memory File System/images/filesystem.png |
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lcp/LCP 62. 交通枢纽/images/1663902572-yOlUCr-image.png |
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solution/0400-0499/0499.The Maze III/maze_2_example_1.png |
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solution/0400-0499/0499.The Maze III/images/maze_2_example_1.png |
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solution/0400-0499/0490.The Maze/images/maze_2_example_1.png |
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solution/0600-0699/0690.Employee Importance/images/1716170929-dkWpra-image.png |
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solution/0800-0899/0863.All Nodes Distance K in Binary Tree/images/sketch0.png |
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solution/1400-1499/1430.Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree/images/leetcode_testcase_1.png |
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solution/1400-1499/1485.Clone Binary Tree With Random Pointer/images/e1.png |
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lcp/LCP 71. 集水器/images/1664424855-dwpUHO-image.png |
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solution/1700-1799/1782.Count Pairs Of Nodes/images/1614828447-GMnLVg-image.png |
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solution/1500-1599/1518.Water Bottles/images/sample_1_1875.png |
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solution/0500-0599/0587.Erect the Fence/images/erect_the_fence_2.png |
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lcp/LCP 27. 黑盒光线反射/images/1599204202-yGDMVk-image.png |
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solution/3500-3599/3535.Unit Conversion II/images/example2.png |
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lcp/LCP 60. 力扣泡泡龙/images/1648180809-XSWPLu-image.png |
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solution/3000-3099/3004.Maximum Subtree of the Same Color/images/20231216-134026.png |
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solution/2400-2499/2498.Frog Jump II/images/example-1.png |
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solution/3100-3199/3148.Maximum Difference Score in a Grid/images/grid1.png |
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solution/1200-1299/1210.Minimum Moves to Reach Target with Rotations/images/image.png |
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lcp/LCP 26. 导航装置/images/1597996812-tqrgwu-image.png |
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solution/1400-1499/1485.Clone Binary Tree With Random Pointer/images/clone_1.png |
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lcp/LCP 60. 力扣泡泡龙/images/1648180769-TLpYop-image.png |
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lcp/LCP 67. 装饰树/images/1663577920-sjrAYH-image.png |
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solution/1400-1499/1485.Clone Binary Tree With Random Pointer/images/e2.png |
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solution/1400-1499/1485.Clone Binary Tree With Random Pointer/images/clone_3.png |
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solution/1800-1899/1824.Minimum Sideway Jumps/images/ic234-q3-ex3.png |
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solution/3200-3299/3203.Find Minimum Diameter After Merging Two Trees/images/example11-transformed.png |
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solution/1800-1899/1824.Minimum Sideway Jumps/images/ic234-q3-ex1.png |
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solution/2300-2399/2320.Count Number of Ways to Place Houses/images/arrangements.png |
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solution/0900-0999/0931.Minimum Falling Path Sum/images/1729566282-dtXwRd-image.png |
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lcof2/剑指 Offer II 026. 重排链表/images/1626420311-PkUiGI-image.png |
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solution/0100-0199/0143.Reorder List/images/1626420311-PkUiGI-image.png |
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lcof2/剑指 Offer II 013. 二维子矩阵的和/images/1626332422-wUpUHT-image.png |
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solution/0300-0399/0304.Range Sum Query 2D - Immutable/images/1626332422-wUpUHT-image.png |
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solution/1400-1499/1485.Clone Binary Tree With Random Pointer/images/clone_2.png |
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solution/1900-1999/1932.Merge BSTs to Create Single BST/images/d2.png |
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solution/1900-1999/1970.Last Day Where You Can Still Cross/images/3.png |
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lcof2/剑指 Offer II 025. 链表中的两数相加/images/1626420025-fZfzMX-image.png |
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solution/0400-0499/0445.Add Two Numbers II/images/1626420025-fZfzMX-image.png |
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lcp/LCP 82. 万灵之树/images/1682322894-vfqJIV-image.png |
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lcp/LCP 38. 守卫城堡/images/1614828242-oveClu-image.png |
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solution/0400-0499/0457.Circular Array Loop/images/1723688183-lRSkjp-image.png |
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lcp/LCP 26. 导航装置/images/1597996826-EUQRyz-image.png |
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solution/2700-2799/2773.Height of Special Binary Tree/images/3.png |
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solution/1600-1699/1660.Correct a Binary Tree/images/ex2v3.png |
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images/leetcode-doocs.png |
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images/doocs-leetcode.png |
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lcof2/剑指 Offer II 026. 重排链表/images/1626420320-YUiulT-image.png |
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solution/0100-0199/0143.Reorder List/images/1626420320-YUiulT-image.png |
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solution/1100-1199/1123.Lowest Common Ancestor of Deepest Leaves/images/sketch1.png |
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solution/0800-0899/0865.Smallest Subtree with all the Deepest Nodes/images/sketch1.png |
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solution/2000-2099/2086.Minimum Number of Food Buckets to Feed the Hamsters/images/example1.png |
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solution/2100-2199/2101.Detonate the Maximum Bombs/images/desmos-eg-3.png |
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solution/1400-1499/1430.Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree/images/leetcode_testcase_3.png |
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solution/1100-1199/1145.Binary Tree Coloring Game/images/1480-binary-tree-coloring-game.png |
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solution/1500-1599/1516.Move Sub-Tree of N-Ary Tree/images/sample_4_964.png |
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solution/1500-1599/1506.Find Root of N-Ary Tree/images/sample_4_964.png |
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solution/1400-1499/1490.Clone N-ary Tree/images/sample_4_964.png |
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solution/0500-0599/0590.N-ary Tree Postorder Traversal/images/sample_4_964.png |
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solution/0500-0599/0589.N-ary Tree Preorder Traversal/images/sample_4_964.png |
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solution/0500-0599/0559.Maximum Depth of N-ary Tree/images/sample_4_964.png |
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solution/0400-0499/0429.N-ary Tree Level Order Traversal/images/sample_4_964.png |
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solution/0400-0499/0428.Serialize and Deserialize N-ary Tree/images/sample_4_964.png |
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solution/0400-0499/0428.Serialize and Deserialize N-ary Tree/images/1727093169-WGFOps-image.png |
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solution/1300-1399/1334.Find the City With the Smallest Number of Neighbors at a Threshold Distance/images/problem1334example0.png |
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lcp/LCP 54. 夺回据点/images/1648707186-LJRwzU-image.png |
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solution/1800-1899/1824.Minimum Sideway Jumps/images/ic234-q3-ex2.png |
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lcp/LCP 38. 守卫城堡/images/1614828218-sIAYkb-image.png |
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solution/1900-1999/1954.Minimum Garden Perimeter to Collect Enough Apples/images/1627790803-qcBKFw-image.png |
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solution/1900-1999/1954.Minimum Garden Perimeter to Collect Enough Apples/images/1527_example_1_2.png |
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solution/1400-1499/1430.Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree/images/leetcode_testcase_2.png |
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solution/1700-1799/1728.Cat and Mouse II/images/sample_2_1955.png |
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solution/2000-2099/2093.Minimum Cost to Reach City With Discounts/images/image-20211129222429-1.png |
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solution/1100-1199/1104.Path In Zigzag Labelled Binary Tree/images/tree.png |
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solution/0800-0899/0872.Leaf-Similar Trees/images/tree.png |
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lcp/LCP 74. 最强祝福力场/images/1681805437-HQkyZS-image.png |
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solution/1900-1999/1924.Erect the Fence II/images/trees1.png |
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solution/1800-1899/1823.Find the Winner of the Circular Game/images/ic234-q2-ex11.png |
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solution/2600-2699/2689.Extract Kth Character From The Rope Tree/images/example2.png |
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Circle/images/chrome_2021年03月25日_22-34-16.pngsolution/0400-0499/0499.The Maze III/maze_2_example_2.pngsolution/0400-0499/0499.The Maze III/images/maze_2_example_2.pngsolution/0400-0499/0490.The Maze/images/maze_2_example_2.pngsolution/2300-2399/2385.Amount of Time for Binary Tree to Be Infected/images/image-20220625231744-1.pnglcci/16.20.T9/images/17_telephone_keypad.pnglcp/LCP 70. 沙地治理/images/1662692397-VlvErS-image.pngsolution/2100-2199/2101.Detonate the Maximum Bombs/images/desmos-eg-2.pngsolution/2000-2099/2086.Minimum Number of Food Buckets to Feed the Hamsters/images/example2.pnglcp/LCP 34. 二叉树染色/images/1616126301-gJbhba-image.pngsolution/2000-2099/2046.Sort Linked List Already Sorted Using Absolute Values/images/image-20211017201240-3.pngsolution/2400-2499/2498.Frog Jump II/images/example-2.pngsolution/2100-2199/2101.Detonate the Maximum Bombs/images/desmos-eg1.pngsolution/2700-2799/2792.Count Nodes That Are Great Enough/images/1.pngsolution/2700-2799/2773.Height of Special Binary Tree/images/1.pngsolution/1700-1799/1765.Map of Highest Peak/images/screenshot-2021年01月11日-at-82045-am.pngsolution/1700-1799/1751.Maximum Number of Events That Can Be Attended II/images/screenshot-2021年01月11日-at-60150-pm.pngsolution/0800-0899/0894.All Possible Full Binary Trees/images/fivetrees.pngsolution/0900-0999/0951.Flip Equivalent Binary Trees/images/tree_ex.pngsolution/2200-2299/2249.Count Lattice Points Inside a Circle/images/exa-11.pngsolution/2000-2099/2077.Paths in Maze That Lead to Same Room/images/image-20211114164827-1.pngsolution/0500-0599/0576.Out of Boundary Paths/images/out_of_boundary_paths_2.pngsolution/1300-1399/1349.Maximum Students Taking Exam/images/image.pngsolution/0400-0499/0427.Construct Quad Tree/images/962_quad_tree.pngsolution/1400-1499/1443.Minimum Time to Collect All Apples in a Tree/images/min_time_collect_apple_1.pngsolution/2400-2499/2493.Divide Nodes Into the Maximum Number of Groups/images/example1.pngsolution/3300-3399/3373.Maximize the Number of Target Nodes After Connecting Trees II/images/3982-1.pngsolution/3300-3399/3372.Maximize the Number of Target Nodes After Connecting Trees I/images/3982-1.pngsolution/0400-0499/0457.Circular Array Loop/images/1723688159-qYjpWT-image.pngsolution/1400-1499/1463.Cherry Pickup II/images/sample_1_1802.pngsolution/1900-1999/1973.Count Nodes Equal to Sum of Descendants/images/screenshot-2021年08月17日-at-17-16-50-diagram-drawio-diagrams-net.pngimages/recommender-fly51fly.pngsolution/1700-1799/1765.Map of Highest Peak/images/screenshot-2021年01月11日-at-82050-am.pnglcp/LCP 71. 集水器/images/1664424894-mClEXh-image.pnglcp/LCP 21. 追逐游戏/images/1597991318-goeHHr-image.pngsolution/0100-0199/0147.Insertion Sort List/images/1724130432-zoOvdI-image.pnglcp/LCP 58. 积木拼接/images/1650509082-wObiEp-middle_img_v2_c2d91eb5-9beb-4c06-9726-f7dae149d86g.pngsolution/1800-1899/1801.Number of Orders in the Backlog/images/ex2.pngsolution/0100-0199/0147.Insertion Sort List/images/1724130414-QbPAjl-image.pngsolution/1000-1099/1080.Insufficient Nodes in Root to Leaf Paths/images/insufficient-11.pngsolution/1000-1099/1080.Insufficient Nodes in Root to Leaf Paths/images/insufficient-1.pngsolution/2400-2499/2481.Minimum Cuts to Divide a Circle/images/22drawio.pngsolution/1500-1599/1516.Move Sub-Tree of N-Ary Tree/images/untitled-diagramdrawio.pngsolution/0500-0599/0505.The Maze II/images/maze_1_example_1.pngsolution/0400-0499/0490.The Maze/images/maze_1_example_1.pngsolution/3100-3199/3157.Find the Level of Tree with Minimum Sum/images/image_2024年05月17日_16-15-46.pngsolution/1900-1999/1924.Erect the Fence II/images/trees1.pnglcp/LCP 74. 最强祝福力场/images/1681805536-zGfghe-image.pngsolution/1300-1399/1325.Delete Leaves With a Given Value/images/sample_1_1684.pngsolution/1400-1499/1443.Minimum Time to Collect All Apples in a Tree/images/min_time_collect_apple_2.pngsolution/3100-3199/3157.Find the Level of Tree with Minimum Sum/images/image_2024年05月17日_16-14-18.pngsolution/1800-1899/1823.Find the Winner of the Circular Game/images/ic234-q2-ex11.pngsolution/3100-3199/3123.Find Edges in Shortest Paths/images/graph35drawio-1.pnglcof/lcof.pngsolution/2900-2999/2973.Find Number of Coins to Place in Tree Nodes/images/screenshot-2023年11月10日-012614.pngsolution/0000-0099/0094.Binary Tree Inorder Traversal/images/tree_2.pngsolution/0100-0199/0145.Binary Tree Postorder Traversal/images/tree_2.pngsolution/0100-0199/0144.Binary Tree Preorder Traversal/images/tree_2.pngsolution/0500-0599/0505.The Maze II/images/maze_1_example_2.pngsolution/0400-0499/0490.The Maze/images/maze_1_example_2.pnglcp/LCP 76. 魔法棋盘/images/1681714583-unbRox-image.pngsolution/1300-1399/1334.Find the City With the Smallest Number of Neighbors at a Threshold Distance/images/problem1334example1.pnglcp/LCP 34. 二叉树染色/images/1616126267-BqaCRj-image.pnglcp/LCP 10. 二叉树任务调度/images/bef743a12591aafb9047dd95d335b8083dfa66e8fdedc63f50fd406b4a9d163a-image.pngsolution/2600-2699/2689.Extract Kth Character From The Rope Tree/images/example1.pngsolution/1900-1999/1970.Last Day Where You Can Still Cross/images/1.pngsolution/2700-2799/2764.Is Array a Preorder of Some Binary Tree/images/1.pnglcof/面试题35. 复杂链表的复制/images/e2.pngsolution/0100-0199/0138.Copy List with Random Pointer/images/e2.pngsolution/0000-0099/0085.Maximal Rectangle/images/1722912576-boIxpm-image.pngsolution/2700-2799/2737.Find the Closest Marked Node/images/image_2023年06月13日_16-35-13.pngsolution/0300-0399/0351.Android Unlock Patterns/images/android-unlock.pngsolution/1000-1099/1022.Sum of Root To Leaf Binary Numbers/images/sum-of-root-to-leaf-binary-numbers.pngsolution/1400-1499/1463.Cherry Pickup II/images/sample_2_1802.pngsolution/2000-2099/2093.Minimum Cost to Reach City With Discounts/images/image-20211129222531-3.pngsolution/1900-1999/1932.Merge BSTs to Create Single BST/images/d1.pngsolution/3100-3199/3123.Find Edges in Shortest Paths/images/graphhhh.pnglcp/LCP 46. 志愿者调配/images/1630061300-WuVkeF-image.pngsolution/2000-2099/2015.Average Height of Buildings in Each Segment/images/image-20210921224001-2.pngsolution/3300-3399/3373.Maximize the Number of Target Nodes After Connecting Trees II/images/3928-2.pngsolution/3300-3399/3372.Maximize the Number of Target Nodes After Connecting Trees I/images/3928-2.pngsolution/0900-0999/0999.Available Captures for Rook/images/1253_example_3_improved.pngsolution/1000-1099/1080.Insufficient Nodes in Root to Leaf Paths/images/insufficient-3.pngsolution/2100-2199/2136.Earliest Possible Day of Full Bloom/images/2.pngsolution/2300-2399/2374.Node With Highest Edge Score/images/image-20220620200212-3.pngsolution/0900-0999/0979.Distribute Coins in Binary Tree/images/tree4.pnglcp/LCP 27. 黑盒光线反射/images/1598951281-ZCBrif-image.pngsolution/1900-1999/1932.Merge BSTs to Create Single BST/images/d3.pngsolution/2100-2199/2152.Minimum Number of Lines to Cover Points/images/image-20220123200023-1.pngsolution/1500-1599/1535.Find the Winner of an Array Game/images/q-example.pngsolution/0900-0999/0979.Distribute Coins in Binary Tree/images/tree1.pnglcof2/剑指 Offer II 047. 二叉树剪枝/images/1028_1.pnglcof2/剑指 Offer II 047. 二叉树剪枝/images/1028.pngsolution/0800-0899/0814.Binary Tree Pruning/images/1028_1.pngsolution/0800-0899/0814.Binary Tree Pruning/images/1028.pnglcp/LCP 49. 环形闯关游戏/images/1630392170-ucncVS-图片.pngsolution/1300-1399/1315.Sum of Nodes with Even-Valued Grandparent/images/1473_ex1.pngsolution/1700-1799/1797.Design Authentication Manager/images/copy-of-pc68_q2.pngsolution/0500-0599/0576.Out of Boundary Paths/images/out_of_boundary_paths_1.pngsolution/1500-1599/1537.Get the Maximum Score/images/sample_1_1893.pngsolution/2000-2099/2049.Count Nodes With the Highest Score/images/example-1.pngsolution/2000-2099/2093.Minimum Cost to Reach City With Discounts/images/image-20211129222650-4.pngsolution/0900-0999/0979.Distribute Coins in Binary Tree/images/tree3.pngsolution/3100-3199/3157.Find the Level of Tree with Minimum Sum/images/image_2024年05月19日_19-07-20.pngsolution/2300-2399/2361.Minimum Costs Using the Train Line/images/ex2drawio.pnglcof2/剑指 Offer II 107. 矩阵中的距离/images/1626667201-NCWmuP-image.pngsolution/0500-0599/0542.01 Matrix/images/1626667201-NCWmuP-image.pngsolution/2800-2899/2852.Sum of Remoteness of All Cells/images/2.pngsolution/1800-1899/1861.Rotating the Box/images/rotatingtheboxleetcode3withstone.pngsolution/2200-2299/2247.Maximum Cost of Trip With K Highways/images/image-20220418173304-1.pngsolution/2800-2899/2852.Sum of Remoteness of All Cells/images/1-new.pngsolution/0500-0599/0554.Brick Wall/images/brick_wall.pngsolution/2300-2399/2361.Minimum Costs Using the Train Line/images/ex1drawio.pngsolution/0400-0499/0457.Circular Array Loop/images/1723688199-nhaMuF-image.pngsolution/0900-0999/0979.Distribute Coins in Binary Tree/images/tree2.pngsolution/2000-2099/2021.Brightest Position on Street/images/image-20210928155140-1.pngsolution/1300-1399/1334.Find the City With the Smallest Number of Neighbors at a Threshold Distance/images/find_the_city_02.pngsolution/1400-1499/1474.Delete N Nodes After M Nodes of a Linked List/images/sample_1_1848.pngsolution/3500-3599/3528.Unit Conversion I/images/1745660099-FZhVTM-example1.pngsolution/1000-1099/1028.Recover a Tree From Preorder Traversal/images/recover-a-tree-from-preorder-traversal.pngsolution/2600-2699/2689.Extract Kth Character From The Rope Tree/images/example2.pnglcp/LCP 21. 追逐游戏/images/1597991157-QfeakF-image.pngsolution/1600-1699/1609.Even Odd Tree/images/sample_1_333_1966.pnglcp/LCP 42. 玩具套圈/images/1629194140-ydKiGF-image.pngsolution/1000-1099/1080.Insufficient Nodes in Root to Leaf Paths/images/insufficient-4.pngsolution/1600-1699/1660.Correct a Binary Tree/images/ex1v2.pngsolution/3100-3199/3148.Maximum Difference Score in a Grid/images/moregridsdrawio-1.pngsolution/2100-2199/2162.Minimum Cost to Set Cooking Time/images/1.pnglcp/LCP 35. 电动车游城市/images/1616125304-mzVxIV-image.pngsolution/1300-1399/1367.Linked List in Binary Tree/images/sample_1_1720.pngsolution/3500-3599/3593.Minimum Increments to Equalize Leaf Paths/images/screenshot-2025年05月28日-at-135704.pngsolution/3500-3599/3593.Minimum Increments to Equalize Leaf Paths/images/1750474560-iuUALZ-screenshot-2025年05月28日-at-135704.pngsolution/1300-1399/1367.Linked List in Binary Tree/images/sample_2_1720.pngsolution/3500-3599/3593.Minimum Increments to Equalize Leaf Paths/images/screenshot-2025年05月28日-at-134018.pngsolution/3500-3599/3593.Minimum Increments to Equalize Leaf Paths/images/1750474560-QqQFdh-screenshot-2025年05月28日-at-134018.pnglcp/LCP 57. 打地鼠/images/1650273183-nZIijm-middle_img_v2_d5d09656-0616-4a80-845e-ece461c5ba9g.pngsolution/3200-3299/3245.Alternating Groups III/images/screenshot-from-2024年06月03日-20-35-50.pnglcof/面试题35. 复杂链表的复制/images/e3.pngsolution/0100-0199/0138.Copy List with Random Pointer/images/e3.pngsolution/2700-2799/2737.Find the Closest Marked Node/images/image_2023年06月13日_16-34-38.pngsolution/1500-1599/1522.Diameter of N-Ary Tree/images/sample_3_1897.pngsolution/0900-0999/0965.Univalued Binary Tree/images/screen-shot-2018年12月25日-at-50104-pm.pngsolution/1400-1499/1478.Allocate Mailboxes/images/sample_11_1816.pngsolution/1300-1399/1339.Maximum Product of Splitted Binary Tree/images/sample_1_1699.pngsolution/2300-2399/2374.Node With Highest Edge Score/images/image-20220620195403-1.pngsolution/1500-1599/1572.Matrix Diagonal Sum/images/sample_1911.pngsolution/1000-1099/1080.Insufficient Nodes in Root to Leaf Paths/images/insufficient-2.pngsolution/2000-2099/2055.Plates Between Candles/images/ex-2.pngsolution/1200-1299/1242.Web Crawler Multithreaded/images/urlhostname.pngsolution/1200-1299/1236.Web Crawler/images/urlhostname.pnglcof2/剑指 Offer II 118. 多余的边/images/1626676174-hOEVUL-image.pngsolution/0600-0699/0684.Redundant Connection/images/1626676174-hOEVUL-image.pngsolution/3200-3299/3208.Alternating Groups II/images/screenshot-2024年05月28日-184240.pngsolution/3600-3699/3615.Longest Palindromic Path in Graph/images/screenshot-2025年06月13日-at-230508.pngsolution/2100-2199/2136.Earliest Possible Day of Full Bloom/images/1.pngsolution/1200-1299/1252.Cells with Odd Values in a Matrix/images/e1.pngsolution/0900-0999/0999.Available Captures for Rook/images/1253_example_2_improved.pngsolution/0800-0899/0802.Find Eventual Safe States/images/picture1.pngsolution/3400-3499/3419.Minimize the Maximum Edge Weight of Graph/images/s2-1.pngsolution/2100-2199/2141.Maximum Running Time of N Computers/images/example1-fit.pngsolution/1300-1399/1339.Maximum Product of Splitted Binary Tree/images/sample_2_1699.pngsolution/1300-1399/1334.Find the City With the Smallest Number of Neighbors at a Threshold Distance/images/find_the_city_01.pngsolution/2100-2199/2127.Maximum Employees to Be Invited to a Meeting/images/05Dxh9.pngsolution/1600-1699/1609.Even Odd Tree/images/sample_1_1966.pngsolution/1300-1399/1325.Delete Leaves With a Given Value/images/sample_2_1684.pngsolution/1400-1499/1483.Kth Ancestor of a Tree Node/images/1528_ex1.pngsolution/2400-2499/2421.Number of Good Paths/images/f9caaac15b383af9115c5586779dec5.pngsolution/1400-1499/1474.Delete N Nodes After M Nodes of a Linked List/images/sample_2_1848.pnglcof2/剑指 Offer II 118. 多余的边/images/1626676179-kGxcmu-image.pngsolution/0600-0699/0684.Redundant Connection/images/1626676179-kGxcmu-image.pngsolution/3200-3299/3206.Alternating Groups I/images/image_2024年05月16日_23-48-211.pngsolution/0100-0199/0101.Symmetric Tree/images/1698026966-JDYPDU-image.pngsolution/2100-2199/2181.Merge Nodes in Between Zeros/images/ex1-1.pngsolution/2400-2499/2421.Number of Good Paths/images/149d3065ec165a71a1b9aec890776ff.pngsolution/1900-1999/1973.Count Nodes Equal to Sum of Descendants/images/screenshot-2021年08月17日-at-17-25-21-diagram-drawio-diagrams-net.pngsolution/3200-3299/3208.Alternating Groups II/images/screenshot-2024年05月28日-182844.pngsolution/2000-2099/2069.Walking Robot Simulation II/images/example-1.pngsolution/1500-1599/1599.Maximum Profit of Operating a Centennial Wheel/images/wheeldiagram12.pnglcp/LCP 29. 乐团站位/images/1616125411-WOblWH-image.pngsolution/3400-3499/3419.Minimize the Maximum Edge Weight of Graph/images/s-1.pngsolution/0500-0599/0558.Logical OR of Two Binary Grids Represented as Quad-Trees/images/new_top.pngsolution/0400-0499/0427.Construct Quad Tree/images/new_top.pngsolution/1000-1099/1008.Construct Binary Search Tree from Preorder Traversal/images/1266.pngsolution/3200-3299/3208.Alternating Groups II/images/screenshot-2024年05月28日-183057.pngsolution/0000-0099/0037.Sudoku Solver/images/250px-sudoku-by-l2g-20050714_solutionsvg.pngsolution/0000-0099/0037.Sudoku Solver/images/250px-Sudoku-by-L2G-20050714_solution.svg.pngsolution/1400-1499/1478.Allocate Mailboxes/images/sample_2_1816.pngsolution/1200-1299/1273.Delete Tree Nodes/images/1421_sample_1.pngsolution/2100-2199/2117.Abbreviating the Product of a Range/images/productdrawio.pngsolution/2100-2199/2127.Maximum Employees to Be Invited to a Meeting/images/ex2.pngsolution/1500-1599/1598.Crawler Log Folder/images/sample_22_1957.pngsolution/0800-0899/0833.Find And Replace in String/images/833-ex2-1.pngsolution/3200-3299/3206.Alternating Groups I/images/image_2024年05月16日_23-49-351.pngsolution/1400-1499/1457.Pseudo-Palindromic Paths in a Binary Tree/images/palindromic_paths_1.pngsolution/3000-3099/3004.Maximum Subtree of the Same Color/images/20231216-134017.pngsolution/0900-0999/0965.Univalued Binary Tree/images/screen-shot-2018年12月25日-at-50050-pm.pnglcp/LCP 67. 装饰树/images/1663575757-yRLGaq-image.pngsolution/1000-1099/1091.Shortest Path in Binary Matrix/images/example2_2.pngsolution/3500-3599/3575.Maximum Good Subtree Score/images/screenshot-2025年04月29日-at-151408.pngsolution/3500-3599/3575.Maximum Good Subtree Score/images/1749281526-byGNAL-screenshot-2025年04月29日-at-151408.pngsolution/3000-3099/3068.Find the Maximum Sum of Node Values/images/screenshot-2023年11月10日-012641.pngsolution/2900-2999/2973.Find Number of Coins to Place in Tree Nodes/images/screenshot-2023年11月10日-012641.pngsolution/1300-1399/1325.Delete Leaves With a Given Value/images/sample_3_1684.pngsolution/1300-1399/1376.Time Needed to Inform All Employees/images/1730_example_3_5.pnglcof2/剑指 Offer II 054. 所有大于等于节点的值之和/images/tree.pnglcof2/剑指 Offer II 047. 二叉树剪枝/images/1028_2.pngsolution/1000-1099/1038.Binary Search Tree to Greater Sum Tree/images/tree.pngsolution/0800-0899/0814.Binary Tree Pruning/images/1028_2.pngsolution/0500-0599/0538.Convert BST to Greater Tree/images/tree.pngsolution/0300-0399/0375.Guess Number Higher or Lower II/images/graph.pngsolution/3200-3299/3208.Alternating Groups II/images/screenshot-2024年05月28日-184128.pngsolution/3200-3299/3208.Alternating Groups II/images/screenshot-2024年05月28日-183907.pngsolution/2300-2399/2368.Reachable Nodes With Restrictions/images/ex2drawio.pngsolution/2100-2199/2181.Merge Nodes in Between Zeros/images/ex2-1.pngsolution/1900-1999/1943.Describe the Painting/images/1.pngsolution/1900-1999/1902.Depth of BST Given Insertion Order/images/2.pngsolution/1400-1499/1424.Diagonal Traverse II/images/sample_2_1784.pngsolution/2100-2199/2192.All Ancestors of a Node in a Directed Acyclic Graph/images/e1.pngsolution/0100-0199/0116.Populating Next Right Pointers in Each Node/images/116_sample.pngsolution/1200-1299/1252.Cells with Odd Values in a Matrix/images/e2.pngsolution/1000-1099/1059.All Paths from Source Lead to Destination/images/485_example_2.pngsolution/2400-2499/2471.Minimum Number of Operations to Sort a Binary Tree by Level/images/image-20220918174006-2.pngsolution/3000-3099/3016.Minimum Number of Pushes to Type Word II/images/keypaddesc.pngsolution/3000-3099/3014.Minimum Number of Pushes to Type Word I/images/keypaddesc.pngsolution/2400-2499/2497.Maximum Star Sum of a Graph/images/max-star-sum-example1drawio.pngsolution/0700-0799/0799.Champagne Tower/images/tower.pngsolution/1300-1399/1379.Find a Corresponding Node of a Binary Tree in a Clone of That Tree/images/e4.pngsolution/2700-2799/2792.Count Nodes That Are Great Enough/images/3.pngsolution/1300-1399/1386.Cinema Seat Allocation/images/cinema_seats_3.pngsolution/3200-3299/3206.Alternating Groups I/images/image_2024年05月16日_23-50-441.pngsolution/1200-1299/1266.Minimum Time Visiting All Points/images/1626_example_1.pngsolution/1200-1299/1235.Maximum Profit in Job Scheduling/images/sample22_1584.pngsolution/0900-0999/0952.Largest Component Size by Common Factor/images/ex2.pngsolution/1300-1399/1377.Frog Position After T Seconds/images/frog_3.pngsolution/2000-2099/2005.Subtree Removal Game with Fibonacci Tree/images/image-20210914173520-3.pngsolution/1000-1099/1059.All Paths from Source Lead to Destination/images/485_example_4.pngsolution/1300-1399/1373.Maximum Sum BST in Binary Tree/images/sample_1_1709.pngsolution/2500-2599/2584.Split the Array to Make Coprime Products/images/capture.pngsolution/1300-1399/1379.Find a Corresponding Node of a Binary Tree in a Clone of That Tree/images/e1.pngsolution/2100-2199/2141.Maximum Running Time of N Computers/images/example2.pngsolution/1200-1299/1245.Tree Diameter/images/1397_example_2.pngsolution/2000-2099/2035.Partition Array Into Two Arrays to Minimize Sum Difference/images/ex3.pngsolution/0500-0599/0510.Inorder Successor in BST II/images/285_example_34.pngsolution/3200-3299/3208.Alternating Groups II/images/screenshot-2024年05月28日-184516.pngsolution/1200-1299/1235.Maximum Profit in Job Scheduling/images/sample1_1584.pngsolution/2400-2499/2497.Maximum Star Sum of a Graph/images/max-star-sum-descdrawio.pngsolution/1800-1899/1861.Rotating the Box/images/rotatingtheboxleetcode2withstones.pngsolution/1600-1699/1669.Merge In Between Linked Lists/images/ll.pngsolution/1600-1699/1669.Merge In Between Linked Lists/images/1709608717-NVGojm-image.pngsolution/2200-2299/2247.Maximum Cost of Trip With K Highways/images/image-20220418173342-2.pngsolution/1400-1499/1494.Parallel Courses II/images/leetcode_parallel_courses_2.pnglcof2/剑指 Offer II 098. 路径的数目/images/robot_maze.pnglcci/08.02.Robot in a Grid/images/robot_maze.pngsolution/1300-1399/1377.Frog Position After T Seconds/images/frog_2.pngsolution/0000-0099/0062.Unique Paths/images/robot_maze.pngsolution/0000-0099/0062.Unique Paths/images/1697422740-adxmsI-image.pngsolution/1000-1099/1028.Recover a Tree From Preorder Traversal/images/recover_tree_ex2.pngsolution/1900-1999/1924.Erect the Fence II/images/trees2.pngsolution/3000-3099/3016.Minimum Number of Pushes to Type Word II/images/keypadv1e2.pngsolution/3000-3099/3014.Minimum Number of Pushes to Type Word I/images/keypadv1e2.pngsolution/2100-2199/2106.Maximum Fruits Harvested After at Most K Steps/images/1.pngsolution/2300-2399/2331.Evaluate Boolean Binary Tree/images/example1drawio1.pngsolution/1800-1899/1861.Rotating the Box/images/rotatingtheboxleetcodewithstones.pngsolution/1500-1599/1598.Crawler Log Folder/images/sample_11_1957.pngsolution/0700-0799/0787.Cheapest Flights Within K Stops/images/cheapest-flights-within-k-stops-3drawio.pngsolution/1000-1099/1028.Recover a Tree From Preorder Traversal/images/screen-shot-2019年04月10日-at-114955-pm.pnglcp/LCP 58. 积木拼接/images/1616125620-nXMCxX-image.pngsolution/2000-2099/2077.Paths in Maze That Lead to Same Room/images/image-20211114164851-2.pngsolution/1300-1399/1311.Get Watched Videos by Your Friends/images/leetcode_friends_2.pnglcp/LCP 80. 生物进化录/images/1682319485-cRVudI-image.pngsolution/2500-2599/2584.Split the Array to Make Coprime Products/images/second.pngsolution/3200-3299/3249.Count the Number of Good Nodes/images/screenshot-2024年06月03日-193552.pngsolution/2400-2499/2467.Most Profitable Path in a Tree/images/eg1.pngsolution/1900-1999/1902.Depth of BST Given Insertion Order/images/1.pngsolution/2100-2199/2174.Remove All Ones With Row and Column Flips II/images/image-20220213162737-2.pngsolution/2100-2199/2147.Number of Ways to Divide a Long Corridor/images/1.pngsolution/3500-3599/3585.Find Weighted Median Node in Tree/images/screenshot-2025年05月26日-at-193857.pngsolution/2700-2799/2737.Find the Closest Marked Node/images/image_2023年06月13日_16-35-47.pngsolution/2100-2199/2127.Maximum Employees to Be Invited to a Meeting/images/ex1.pnglcci/17.21.Volume of Histogram/images/rainwatertrap.pngsolution/2000-2099/2056.Number of Valid Move Combinations On Chessboard/images/a4.pngsolution/0000-0099/0042.Trapping Rain Water/images/rainwatertrap.pngsolution/0100-0199/0117.Populating Next Right Pointers in Each Node II/images/117_sample.pngsolution/2200-2299/2285.Maximum Total Importance of Roads/images/ex1drawio.pngsolution/0900-0999/0988.Smallest String Starting From Leaf/images/image_1551131779.pngsolution/2900-2999/2950.Number of Divisible Substrings/images/old_phone_digits.pngsolution/1000-1099/1059.All Paths from Source Lead to Destination/images/485_example_1.pngsolution/0800-0899/0833.Find And Replace in String/images/833-ex1.pngsolution/2200-2299/2203.Minimum Weighted Subgraph With the Required Paths/images/example1drawio.pngsolution/1300-1399/1379.Find a Corresponding Node of a Binary Tree in a Clone of That Tree/images/e3.pngsolution/1000-1099/1028.Recover a Tree From Preorder Traversal/images/screen-shot-2019年04月10日-at-114101-pm.pngsolution/1000-1099/1080.Insufficient Nodes in Root to Leaf Paths/images/screen-shot-2019年06月11日-at-83301-pm.pngsolution/3000-3099/3068.Find the Maximum Sum of Node Values/images/screenshot-2023年11月10日-012513.pngsolution/2900-2999/2973.Find Number of Coins to Place in Tree Nodes/images/screenshot-2023年11月10日-012513.pngsolution/2000-2099/2087.Minimum Cost Homecoming of a Robot in a Grid/images/eg-1.pngsolution/2000-2099/2035.Partition Array Into Two Arrays to Minimize Sum Difference/images/ex1.pngsolution/1200-1299/1260.Shift 2D Grid/images/e1.pngsolution/1200-1299/1260.Shift 2D Grid/images/e1-1.pngsolution/2000-2099/2045.Second Minimum Time to Reach Destination/images/e2.pngsolution/0900-0999/0988.Smallest String Starting From Leaf/images/tree2.pnglcs/LCS 03. 主题空间/images/1613707985-KJyiXJ-image.pngsolution/2900-2999/2925.Maximum Score After Applying Operations on a Tree/images/graph-13-1.pngsolution/0900-0999/0988.Smallest String Starting From Leaf/images/tree1.pngsolution/2600-2699/2603.Collect Coins in a Tree/images/graph-4.pngsolution/0300-0399/0364.Nested List Weight Sum II/images/nestedlistweightsumiiex2.pngsolution/1600-1699/1609.Even Odd Tree/images/sample_2_1966.pngsolution/1700-1799/1786.Number of Restricted Paths From First to Last Node/images/restricted_paths_ex1.pngsolution/2800-2899/2846.Minimum Edge Weight Equilibrium Queries in a Tree/images/graph-9-1.pngsolution/2600-2699/2689.Extract Kth Character From The Rope Tree/images/example3.pngsolution/3200-3299/3245.Alternating Groups III/images/screenshot-from-2024年06月03日-20-25-02-2.pngsolution/0900-0999/0999.Available Captures for Rook/images/1253_example_1_improved.pngsolution/2000-2099/2055.Plates Between Candles/images/ex-1.pngsolution/2100-2199/2174.Remove All Ones With Row and Column Flips II/images/image-20220213162716-1.pngsolution/2000-2099/2074.Reverse Nodes in Even Length Groups/images/eg1.pngsolution/0800-0899/0838.Push Dominoes/images/domino.pngsolution/0100-0199/0101.Symmetric Tree/images/1698027008-nPFLbM-image.pnglcof2/剑指 Offer II 022. 链表中环的入口节点/images/linked-list-cycle-ii.pnglcci/02.08.Linked List Cycle/images/linked-list-cycle-ii.pngsolution/2000-2099/2096.Step-By-Step Directions From a Binary Tree Node to Another/images/eg1.pngsolution/0100-0199/0142.Linked List Cycle II/images/linked-list-cycle-ii.pngsolution/1000-1099/1028.Recover a Tree From Preorder Traversal/images/recover_tree_ex1.pngsolution/0300-0399/0364.Nested List Weight Sum II/images/nestedlistweightsumiiex1.pnglcp/LCP 29. 乐团站位/images/1616125437-WUOwsu-image.pngsolution/3200-3299/3249.Count the Number of Good Nodes/images/tree1.pngsolution/2200-2299/2267.Check if There Is a Valid Parentheses String Path/images/example1drawio.pngsolution/2100-2199/2147.Number of Ways to Divide a Long Corridor/images/2.pngsolution/2000-2099/2022.Convert 1D Array Into 2D Array/images/image-20210826114243-1.pngsolution/3200-3299/3208.Alternating Groups II/images/screenshot-2024年05月28日-182448.pngsolution/2000-2099/2005.Subtree Removal Game with Fibonacci Tree/images/image-20210914173425-1.pngsolution/2000-2099/2065.Maximum Path Quality of a Graph/images/ex31drawio.pngsolution/1300-1399/1372.Longest ZigZag Path in a Binary Tree/images/sample_2_1702.pngsolution/2100-2199/2106.Maximum Fruits Harvested After at Most K Steps/images/2.pngsolution/1400-1499/1457.Pseudo-Palindromic Paths in a Binary Tree/images/palindromic_paths_2.pngsolution/1400-1499/1466.Reorder Routes to Make All Paths Lead to the City Zero/images/sample_1_1819.pngsolution/1000-1099/1028.Recover a Tree From Preorder Traversal/images/recover_tree_ex3.pngsolution/2100-2199/2130.Maximum Twin Sum of a Linked List/images/eg2drawio.pngsolution/2100-2199/2106.Maximum Fruits Harvested After at Most K Steps/images/3.pngsolution/2200-2299/2285.Maximum Total Importance of Roads/images/ex2drawio.pngsolution/1500-1599/1522.Diameter of N-Ary Tree/images/sample_1_1897.pngsolution/2100-2199/2130.Maximum Twin Sum of a Linked List/images/eg1drawio.pngsolution/0300-0399/0308.Range Sum Query 2D - Mutable/images/308_range_sum_query_2d_mutable.pngsolution/0900-0999/0971.Flip Binary Tree To Match Preorder Traversal/images/1219-02.pngsolution/3200-3299/3245.Alternating Groups III/images/screenshot-from-2024年06月03日-20-36-40.pngsolution/2400-2499/2471.Minimum Number of Operations to Sort a Binary Tree by Level/images/image-20220918174052-4.pngsolution/1900-1999/1992.Find All Groups of Farmland/images/screenshot-2021年07月27日-at-12-23-15-copy-of-diagram-drawio-diagrams-net.png1289 images did not require optimisation.