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| Question Number | Official Website Link | Solution's Link | 
|---|---|---|
| 025 | reverse nodes in k group | hard | 
| 092 | reverse linked list II | medium | 
| 206 | reverse linked list | easy | 
| 234 | palindrome linked list | easy | 
| Question Number | Official Website Link | Solution's Link | 
|---|---|---|
| 105 | construct binary tree from preorder and inorder traversal | medium | 
| 106 | construct binary tree from inorder and postorder traversal | medium | 
| 654 | maximum binary tree | medium | 
| Question Number | Official Website Link | Solution's Link | 
|---|---|---|
| 005 | longest palindromic substring | medium | 
| 011 | container with most water | medium | 
| 026 | remove duplicates from sorted array | easy | 
| 042 | trapping rain water | hard | 
| 076 | minimum window substring | hard | 
| 141 | linked list cycle | easy | 
| 142 | linked list cycle ii | medium | 
| 189 | rotate array | medium | 
| 283 | move zeros | easy | 
| 287 | find the duplicate number | medium | 
| 344 | reverse string | easy | 
| Question Number | Official Website Link | Solution's Link | 
|---|---|---|
| 239 | sliding window maximum | hard | 
| Question Number | Official Website Link | Solution's Link | 
|---|---|---|
| 033 | search in rotated sorted array i | medium | 
| 034 | find first and last position of element in sorted array | medium | 
| 069 | sqrtx | easy | 
| 074 | search a 2d matrix | medium | 
| 081 | search in rotated sorted array ii | medium | 
| 153 | find minimum in rotated sorted array | medium | 
| 240 | search a 2d matrix ii | medium | 
| 540 | single element in a sorted array | medium | 
| 704 | binary-search | easy | 
| 744 | find smallest letter greater than target | easy | 
| 852 | peak index in a mountain array | easy | 
| 875 | koko eating bananas | medium | 
| 1011 | capacity to ship packages within d days | medium | 
| Question Number | Official Website Link | Solution's Link | 
|---|---|---|
| 020 | valid parentheses | easy | 
| 496 | next greater element i | easy | 
| 503 | next greater element ii | medium | 
| 735 | asteroid collision | medium | 
| 739 | daily temperatures | medium | 
| Question Number | Official Website Link | Solution's Link | 
|---|---|---|
| 001 | Two Sum | easy | 
| 003 | longest substring without repeating characters | medium | 
| 560 | subarray sum equals k | medium |