Arrays Recommended Order By Topic Basic Array Questions Order Question Difficulty Votes 1 Two Sum Easy 2 Contains Duplicate Easy 3 Missing Number Easy 4 Best Time to Buy and Sell Stock Easy 5 Maximum Subarray Easy 6 Move Zeroes Easy 7 Find the Duplicate Number Medium 8 Rotate Array Medium 9 Product of Array Except Self Medium 10 Maximum Product Subarray Medium 11 Three Sum Medium 12 Container with Most Water Medium Binary Search Order Question Difficulty Votes 1 Binary Search Easy * 2 First Bad Version Easy 3 Search in a Rotated Sorted Array Medium 4 Find Mininum in Rotated Sorted Array Medium 5 Find Peak Element Medium Intervals Order Question Difficulty Votes 1 Meeting Rooms Easy 2 Merge Intervals Medium 3 Meeting Rooms II Medium