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1 Number of Connected Components in an Undirected Graph Medium 2 Alien Dictionary Hard 3 Palindromic Substrings Medium 4 Unique Paths Medium 5 Distinct Subsequences Hard 6 Gas Station Medium 7 Non-overlapping Intervals Medium 8 Happy Number Easy 9 Counting Bits Easy 10 Two Sum Easy 11 Valid Palindrome Easy 12 Longest Repeating Character Replacement Medium 13 Generate Parentheses Medium 14 Find Minimum in Rotated Sorted Array Medium 15 Remove Nth Node From End of List Medium 16 Reverse Nodes in k-Group Hard 17 Lowest Common Ancestor of a Binary Search Tree Medium 18 Binary Tree Maximum Path Sum Hard 19 K Closest Points to Origin Medium 20 Permutations Medium 21 Number of Islands Medium 22 Course Schedule Medium 23 Min Cost to Connect All Points Medium 24 House Robber Medium 25 Word Break Medium 26 Target Sum Medium 27 Maximum Subarray Medium 28 Valid Parenthesis String Medium 29 Rotate Image Medium 30 Detect Squares Medium