摘要：
Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have ex 阅读全文
摘要：
5/29 611 valid triangle number -- three pointers -> binary search 1 two sum (hashmap --> need index) 5/31 15 3 sum (two pointers, hashset) 8/5 234 pal 阅读全文
摘要：
Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we tak 阅读全文