The first line of input contains T denoting the number of testcases. T testcases follow. Each testcase contains one line of input containing n. This is a function problem. You do not need to take any ...

Today, I solved the problem of “Two Sum,” and it was a see-it-yourself. My first thought was to go with a brute-force approach. But isn’t that just too easy? Optimization is where the real trouble ...