3Sum 的一种简单形式, 并且都没有找index, value, 而只是找个sum罢了. double for loop。 2Sum只能用土办法 left/right 2 pointers。 O(n^2) 注意：check closest时候用long, 以免int不够用 Given an array S of n integers, find ...
// Problem Statement: Given an array of size N. Find the highest and lowest frequency element. // Explanation: The frequency of 10 is 3, i.e. the highest and the frequency of 15 is 1 i.e. the lowest. ...
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