class Solution {
public:
    int numSquares(int n) {
        vector<int> f(n + 1);
        for (int i = 1; i <= n; i++) {
            int minn = INT_MAX;
            for (int j = 1; j * j <= i; j++) {
                minn = min(minn, f[i - j * j]);
            }
            f[i] = minn + 1;
        }
        return f[n];
    }
};

作者：力扣官方题解
链接：https://leetcode.cn/problems/perfect-squares/solutions/822940/wan-quan-ping-fang-shu-by-leetcode-solut-t99c/
来源：力扣（LeetCode）
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