蓝桥杯历年真题官方题解——平方和

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Long res = 0L;//保存答案
        for (int i = 1; i <= 2019; i++)            if (check(i)) res += i*i;//求平方和        System.out.print(res);    }
    static boolean check(int n) {        String a=n+"";        if (a.contains("2")||a.contains("0")||a.contains("1")||a.contains("9")){            return true;//若含有特定数位则返回 true        }else {            return false;
        }    }
}

#include <iostream>using namespace std;
bool check(int x) {//进行数位判断    int c;    while (x) {        c = x % 10;        if (c == 0 || c == 2 || c == 1 || c == 9) {            return true;//若含有特定数位则返回 true        }        x /= 10;    }    return false;}
int main() {    long long  res = 0;//保存答案    for (int i = 1; i <= 2019; i++) {        if (check(i)) {            res += i * i;//求平方和        }    }    cout << res << endl;    return 0;}