Codeplay
Introduction
to-do list
N Sum
two sum: given sorted array
two sum: given unsorted array
two sum: given binary search tree
two sum: data structure design
3 sum
3Sum Closest
3Sum Smaller
4 sum
4 sum count
Pattern Summary
Subarray
Find Pivot Index
Subarray Sum Equals K
Patterns for subarray
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3Sum Smaller
LeetCode 259. 3Sum Smaller
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