0034-find-first-and-last-position-of-element-in-sorted-array 0042-trapping-rain-water 0046-permutations 0050-powx-n 0053-maximum-subarray 0062-unique-paths 0063-unique-paths-ii 0069-sqrtx 0070-climbing-stairs 0078-subsets 0083-remove-duplicates-from-sorted-list 0084-largest-rectangle-in-histo...