09-29 [LeetCode][658. Find K Closest Elements] 4 Approaches: Two Pointers, Sorting, Priority Queue and Binary Search
09-28 [LeetCode][19. Remove Nth Node From End of List] 3 Approaches: Brute Force, Stack, Slow Fast Pointers with Animation
09-18 [LeetCode][42. Trapping Rain Water] From Brute Force to DP to Two Pointers with Detail Explaination