摘要：
原题 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, given n = 阅读全文
摘要：
原题 You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you 阅读全文