完全平方数

Posted 2022-02-12 Alice_yufeng

class Solution 
    public int numSquares(int n) 
        int[] f = new int[n + 1];
        for (int i = 1; i <= n; i++) 
            int minn = Integer.MAX_VALUE;
            for (int j = 1; j * j <= i; j++) 
                minn = Math.min(minn, f[i - j * j]);
            
            f[i] = minn + 1;
        
        return f[n];