Practice-Coding-Questions Personal Practice Set - Doing One a Day (sometimes) in a Variety of Languages (Mostly Python)!
# Difficulty Problem Solution 1 Easy Two Sum Java , Python , Ruby 2 Medium Add Two Numbers C 3 Medium Longest Substring Without Repeating Characters Python 4 Hard Median of Two Sorted Arrays Python 5 Medium Longest Palindromic Substring Python 6 Medium Zig Zag Conversion Java 7 Easy Reverse Integer Python 8 Medium String to Integer Ruby 9 Easy Palindrome Number C , Java , Python , Swift 10 Hard Regular Expression Matching Python 11 Medium Container With Most Water Python 12 Medium Integer to Roman Python 13 Easy Roman to Integer C , Python 14 Easy Longest Common Prefix Python 15 Medium 3Sum Python 16 Medium 3Sum Closest Python 17 Medium Letter Combinations of a Phone Number Python 18 Medium 4Sum Python 19 Medium Remove Nth Node From End of List Python 20 Easy Valid Parentheses Java , Python 21 Easy Merge Two Sorted Lists Java , Python 22 Medium Generate Parentheses Python 23 Hard Merge k Sorted Lists Python 24 Medium Swap Node in Pairs Python 25 Hard Reverse Nodes in k-Group Python 26 Easy Remove Duplicates from Sorted Array C , Python 27 Easy Remove Element Python 28 Easy Implement strStr() C , Python 29 Medium Divide Two Integers Python 31 Medium Next Permutation Python 33 Medium Search in Rotated Sorted Array Python 34 Medium Find First and Last Position of Element in Sorted Array Python 35 Easy Search Insert Position Go , Java , JavaScript , Scala 36 Medium Valid Sudoku Python 38 Easy Count and Say Python 39 Medium Combination Sum Python 40 Medium Combination Sum II Python 42 Hard Trapping Rain Water Python 43 Medium Multiply Strings Python 44 Hard Wildcard Matching Python 46 Medium Permutations Python 47 Medium Permutations II Python 48 Medium Rotate Image Python 49 Medium Group Anagrams Python 50 Medium Pow(x, n) Python 53 Easy Maximum Subarray Java 54 Medium Spiral Matrix Python 55 Medium Jump Game Python 56 Medium Merge Intervals Python 58 Easy Length of Last Word Python 62 Medium Unique Paths Python 63 Medium Unique Paths II Python 64 Medium Minimum Path Sum Python 66 Easy Plus One Python 67 Easy Add Binary Python 69 Easy Sqrt() Python 70 Easy Climbing Stairs C 76 Hard Minimum Window Substring Python 78 Medium Subsets Python 79 Medium Word Search Python 83 Easy Remove Duplicates from Sorted List Python 84 Hard Largest Rectangle in Histogram Python 85 Hard Maximal Rectangle Python 88 Easy Merge Sorted Array Python 100 Easy Same Tree Python 101 Easy Symmetric Tree Python 102 Medium Binary Tree Level Order Traversal Python 104 Easy Maximum Depth of Binary Tree Python 105 Medium Construct Binary Tree from Preorder and Inorder Traversal Python 106 Medium Construct Binary Tree from Inorder and Postorder Traversal Python 107 Easy Binary Tree Level Order Traversal II Python 108 Easy Convert Sorted Array to Binary Search Tree Python 110 Easy Balanced Binary Tree Python 111 Easy Minimum Depth of Binary Tree Python 112 Easy Path Sum Python 118 Easy Pascal's Triangle Python 121 Easy Best Time to Buy and Sell Stock Python 122 Easy Best Time to Buy and Sell Stock II Python 123 Hard Best Time to Buy and Sell Stock III Python 125 Easy Valid Palindrome Python 127 Medium Word Ladder Python 133 Medium Clone Graph Python 136 Easy Single Number Python 137 Medium Single Number II Python 139 Medium Word Break Python 141 Easy Linked List Cycle Python 142 Medium Linked List Cycle II Python 146 Hard LRU Cache Python 148 Medium Sort List Python 153 Medium Find Minimum in Rotated Sorted Array Python 155 Easy Min Stack Python 162 Medium Find Peak Element Python 168 Easy Excel Sheet Column Title Python 171 Easy Excel Sheet Column Number Python 173 Medium Binary Search Tree Iterator Python 188 Hard Best Time to Buy and Sell Stock IV Python 191 Easy Number of 1 Bits Python 196 Easy Delete Duplicate Emails SQL 200 Medium Number of Islands Python 204 Easy Count Primes Python 206 Easy Reverse Linked List Python 207 Medium Course Schedule Python 208 Medium Implement Trie Java , Python 215 Medium Kth Largest Element in an Array Python 218 Hard The Skyline Problem Python 226 Easy Invert Binary Tree Python 231 Easy Power Of Two Python 234 Easy Palindrome Linked List Python 235 Easy Lowest Common Ancestor of a Binary Search Tree Python 236 Medium Lowest Common Ancestor of a Binary Tree Python 237 Easy Delete Node in a Linked List Python 238 Medium Product of Array Except Self Python 240 Medium Search a 2D Matrix II Python 258 Easy Add Digits Python 268 Easy Missing Number Python 273 Hard Integer to English Words Python 283 Easy Move Zeroes Python 287 Medium Find the Duplicate Number Python 295 Hard Find Median from Data Stream Python 297 Hard Serialize and Deserialize Binary Tree Java 301 Hard Remove Invalid Parentheses Python 310 Medium Minimum Height Trees Python 341 Medium Flatten Nested List Iterator Python 344 Easy Reverse String Python 388 Medium Longest Absolute File Path Python 389 Easy Find the Difference Python 461 Easy Hamming Distance Python 495 Medium Teemo Attacking Python 535 Medium Encode and Decode TinyURL Python 733 Easy Flood Fill Python 771 Easy Jewels and Stones Python 1114 Easy Print in Order Python
30 Days of Code Challenge
Cracking the Coding Interview 6th Edition Python Solutions
