Realvie

摘要： Question: Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. For example, giv 阅读全文

摘要： Question: Given an array of integers, find out whether there are two distinct indices i and j in the array such that the absolute difference between n 阅读全文