Leetcode-279_Perfect Squares(完美广场)-动态规划、数学、广度优先遍历-【C++】

Leetcode-279Perfect Squares(完美广场) 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 = 12, return 3 because
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