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‎README.md‎

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@@ -9,25 +9,37 @@ Straightforward solutions
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- Written in [Swift 4.2](https://swift.org/blog/swift-4-2-released/)
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## Problems and Solutions - Easy
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| # | Problem | Solution |
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| ---- |:-------------| -----:|
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| 1 |[Two Sum](https://leetcode.com/problems/two-sum/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0001-TwoSum.playground/Contents.swift) |
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| 7 | [Reverse Integer](https://leetcode.com/problems/reverse-integer/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0007-ReverseInteger%2B0069-Sqrtx.playground/Contents.swift) |
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| 9 | [Palindrome Number](https://leetcode.com/problems/palindrome-number/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0009-PalindromeNumber.playground/Contents.swift) |
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| 13 | [Roman to Integer](https://leetcode.com/problems/roman-to-integer/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0013-RomanToInteger.playground/Contents.swift) |
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| 14 | [Longest Common Prefix](https://leetcode.com/problems/longest-common-prefix/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0014-LongestCommonPrefix.playground/Contents.swift) |
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| 20 | [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0020-ValidParentheses.playground/Contents.swift) |
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| 21 | [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0021-MergeTwoSortedLists.playground/Contents.swift) |
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| 26 | [Remove Duplicate from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0026-RemoveDuplicatesfromSortedArray.playground/Contents.swift) |
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| 27 | [Remove Element](https://leetcode.com/problems/remove-element/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0027-RemoveElement.playground/Contents.swift) |
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| 28 | [Implement strStr()](https://leetcode.com/problems/implement-strstr/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0028-ImplementstrStr().playground/Contents.swift) |
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| 35 | [Search Insert Position](https://leetcode.com/problems/search-insert-position/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0035-SearchInsertPosition.playground/Contents.swift) |
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| 53 | [Maximum Subarray](https://leetcode.com/problems/maximum-subarray/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0053-MaximumSubarray.playground/Contents.swift) |
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| 66 | [Plus One](https://leetcode.com/problems/plus-one/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0066-PlusOne.playground/Contents.swift) |
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| 67 | [Add Binary](https://leetcode.com/problems/add-binary/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0067-AddBinary.playground/Contents.swift) |
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| 88 | [Merge Sorted Array](https://leetcode.com/problems/merge-sorted-array/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0088-MergeSortedArray.playground/Contents.swift) |
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| 167 | [Two Sum II - Input array is sorted](https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0167-TwoSumII.playground/Contents.swift) |
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| 206 | [Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0206-ReverseLinkedList.playground/Contents.swift) |
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| 766 | [Toeplitz Matrix](https://leetcode.com/problems/toeplitz-matrix/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0766-ToeplitzMatrix.playground/Contents.swift) |
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| 876 | [Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0876-MiddleOfTheLinkedList.playground/Contents.swift) |
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| # | Problem | Solution || # | Problem | Solution |
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| ---- |:-------------| -----:|-| ---- |:-------------| -----:|
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| 1 |[Two Sum](https://leetcode.com/problems/two-sum/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0001-TwoSum.playground/Contents.swift)|| 7 | [Reverse Integer](https://leetcode.com/problems/reverse-integer/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0007-ReverseInteger%2B0069-Sqrtx.playground/Contents.swift) |
15+
| 9 | [Palindrome Number](https://leetcode.com/problems/palindrome-number/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0009-PalindromeNumber.playground/Contents.swift)|| 13 | [Roman to Integer](https://leetcode.com/problems/roman-to-integer/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0013-RomanToInteger.playground/Contents.swift) |
16+
| 14 | [Longest Common Prefix](https://leetcode.com/problems/longest-common-prefix/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0014-LongestCommonPrefix.playground/Contents.swift)|| 20 | [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0020-ValidParentheses.playground/Contents.swift) |
17+
| 21 | [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0021-MergeTwoSortedLists.playground/Contents.swift)|| 26 | [Remove Duplicate from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0026-RemoveDuplicatesfromSortedArray.playground/Contents.swift) |
18+
| 27 | [Remove Element](https://leetcode.com/problems/remove-element/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0027-RemoveElement.playground/Contents.swift)|| 28 | [Implement strStr()](https://leetcode.com/problems/implement-strstr/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0028-ImplementstrStr().playground/Contents.swift)|| 35 | [Search Insert Position](https://leetcode.com/problems/search-insert-position/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0035-SearchInsertPosition.playground/Contents.swift) |
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| 53 | [Maximum Subarray](https://leetcode.com/problems/maximum-subarray/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0053-MaximumSubarray.playground/Contents.swift)|| 66 | [Plus One](https://leetcode.com/problems/plus-one/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0066-PlusOne.playground/Contents.swift) |
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| 67 | [Add Binary](https://leetcode.com/problems/add-binary/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0067-AddBinary.playground/Contents.swift)|| 70 | [Climbing Stairs](https://leetcode.com/problems/climbing-stairs/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0070-ClimbingStairs.playground/Contents.swift) |
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| 88 | [Merge Sorted Array](https://leetcode.com/problems/merge-sorted-array/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0088-MergeSortedArray.playground/Contents.swift)|| 167 | [Two Sum II - Input array is sorted](https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0167-TwoSumII.playground/Contents.swift) |
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| 206 | [Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0206-ReverseLinkedList.playground/Contents.swift)|| 500 | [Keyboard Row](https://leetcode.com/problems/keyboard-row/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0500-KeyboardRow.playground/Contents.swift) |
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| 766 | [Toeplitz Matrix](https://leetcode.com/problems/toeplitz-matrix/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0766-ToeplitzMatrix.playground/Contents.swift)|| 876 | [Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0876-MiddleOfTheLinkedList.playground/Contents.swift) |
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| 892 | [Surface Area of 3D Shapes](https://leetcode.com/problems/surface-area-of-3d-shapes/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Easy/0892-SurfaceAreaOf3DShapes.playground/Contents.swift) |
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## Problems and Solutions - Medium
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| # | Problem | Solution || # | Problem | Solution |
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| ---- |:-------------| -----:|-| ---- |:-------------| -----:|
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| 2 | [Add Two Numbers](https://leetcode.com/problems/add-two-numbers/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Medium/0002-AddTwoNumbers.playground/Contents.swift)|| 3 | [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Medium/0003-LongestSubstringWithoutRepeatingCharacters.playground/Contents.swift) |
30+
| 6 | [ZigZag Conversion](https://leetcode.com/problems/zigzag-conversion/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Medium/0006-ZigZagConversion.playground/Contents.swift)|| 11 | [Container With Most Water](https://leetcode.com/problems/container-with-most-water/description/) | [Solution](https://github.com/twho/LeetCode-Swift/blob/master/Medium/0003-LongestSubstringWithoutRepeatingCharacters.playground/Contents.swift) |
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| 12 | [Integer to Roman](https://leetcode.com/problems/integer-to-roman/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0012-IntegerToRoman.playground/Contents.swift)|| 15 | [3Sum](https://leetcode.com/problems/3sum/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0015-3Sum.playground/Contents.swift) |
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| 16 | [3Sum Closest](https://leetcode.com/problems/3sum-closest/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0016-3SumClosest.playground/Contents.swift)|| 17 | [Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0017-LetterCombinationsOfAPhoneNumber.playground/Contents.swift) |
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| 18 | [4Sum](https://leetcode.com/problems/4sum/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0018-4Sum.playground/Contents.swift)|| 19 | [Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0019-RemoveNthNodeFromEndofList.playground/Contents.swift) |
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| 24 | [Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0024-SwapNodesInPairs.playground/Contents.swift)|| 29 | [Divide Two Integers](https://leetcode.com/problems/divide-two-integers/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0029-DivideTwoIntegers.playground/Contents.swift) |
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| 33 | [Search in Rotated Sorted Array](https://leetcode.com/problems/search-in-rotated-sorted-array/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0033-SearchInRotatedSortedArray.playground/Contents.swift)|| 39 | [Combination Sum](https://leetcode.com/problems/combination-sum/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0039-CombinationSum.playground/Contents.swift) |
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| 40 | [Combination Sum II](https://leetcode.com/problems/combination-sum-ii/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0040-CombinationSumII.playground/Contents.swift)|| 46 | [Permutations](https://leetcode.com/problems/permutations/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0046-Permutations.playground/Contents.swift) |
37+
| 48 | [Rotate Image](https://leetcode.com/problems/rotate-image/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0048-RotateImage.playground/Contents.swift)|| 49 | [Group Anagrams](https://leetcode.com/problems/group-anagrams/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0049-GroupAnagrams.playground/Contents.swift) |
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| 56 | [Merge Intervals](https://leetcode.com/problems/merge-intervals/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0056-MergeIntervals.playground/Contents.swift)|| 61 | [Rotate List](https://leetcode.com/problems/rotate-list/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0061-RotateList.playground/Contents.swift) |
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| 62 | [Unique Paths](https://leetcode.com/problems/unique-paths/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0062-UniquePaths.playground/Contents.swift)|| 75 | [Sort Colors](https://leetcode.com/problems/sort-colors/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0075-SortColors.playground/Contents.swift) |
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| 78 | [Subsets](https://leetcode.com/problems/subsets/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0078-Subsets.playground/Contents.swift)|| 80 | [Remove Duplicates from Sorted Array II](https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0080-RemoveDuplicatesFromSortedArrayII.playground/Contents.swift) |
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| 90 | [Subsets II](https://leetcode.com/problems/subsets-ii/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0090-SubsetsII.playground/Contents.swift)|| 134 | [Gas Station](https://leetcode.com/problems/gas-station/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0134-GasStation.playground/Contents.swift) |
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| 148 | [Sort List](https://leetcode.com/problems/sort-list/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0148-SortList.playground/Contents.swift)|| 152 | [Maximum Product Subarray](https://leetcode.com/problems/maximum-product-subarray/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0152-MaximumProductSubarray.playground/Contents.swift) |
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| 153 | [Find Minimum in Rotated Sorted Array](https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0153-FindMinimumInRotatedSortedArray.playground/Contents.swift)|| 200 | [Number of Islands](https://leetcode.com/problems/number-of-islands/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0200-NumberOfIslands.playground/Contents.swift) |
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| 238 | [Product of Array Except Self](https://leetcode.com/problems/product-of-array-except-self/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0238-ProductOfArrayExceptSelf.playground/Contents.swift)|| 287 | [Find the Duplicate Number](https://leetcode.com/problems/find-the-duplicate-number/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0287-FindTheDuplicateNumber.playground/Contents.swift) |
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| 395 | [Longest Substring with At Least K Repeating Characters](https://leetcode.com/problems/longest-substring-with-at-least-k-repeating-characters/description/) | [Solution](https://github.com/twho/LeetCode-Swift/tree/master/Medium/0395-LongestSubstringwithAtLeastKRepeatingCharacters.playground/Contents.swift)|

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