128. Longest Consecutive Sequence (Hard)
Given an unsorted array of integers, find the length of the longest consecutive elements sequence.
334. Increasing Triplet Subsequence (Medium)
Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array.
42. Trapping Rain Water (Hard)
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.
309. Best Time to Buy and Sell Stock with Cooldown (Medium)
Say you have an array for which the ith element is the price of a given stock on day i.
188. Best Time to Buy and Sell Stock IV (Hard)
Say you have an array for which the i-th element is the price of a given stock on day i.
123. Best Time to Buy and Sell Stock III (Hard)
122. Best Time to Buy and Sell Stock II (Easy)
121. Best Time to Buy and Sell Stock (Easy)
45. Jump Game II (Hard)
Given an array of non-negative integers, you are initially positioned at the first index of the array.
Each element in the array represents your maximum jump length at that position.