[Silver 3] 1699번 제곱수의 합

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        int[] dp = new int[n+1];
        
        for(int i=1; i<=n; i++) {
            dp[i] = i;
            for(int j=1; j*j<=i; j++) {
                if(dp[i]>dp[i-j*j]+1) { dp[i] = dp[i-j*j]+1; }
            }
        }
        
        System.out.println(dp[n]);
    }
}