two pointers

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Examples

Easy

Number	Note
26. Remove Duplicates from Sorted Array
27. Remove Element
88. Merge Sorted Array
125. Valid Palindrome
283. Move Zeroes
344. Reverse String
680. Valid Palindrome II
844. Backspace String Compare
977. Squares of a Sorted Array
1768. Merge Strings Alternately

Medium

Number	Note
11. Container With Most Water
15. 3Sum
16. 3Sum Closest
18. 4Sum
167. Two Sum II - Input Array Is Sorted
189. Rotate Array
881. Boats to Save People

Hard

Number	Note
42. Trapping Rain Water

Optional