题解 | #守形数#

#include<bits/stdc++.h>
using namespace std;

//11 121

int main() {

    int N;
    while (cin >> N) {
        int a = N * N, b = N;
        bool flag = false;
        while (b > 0) {
            if (a % 10 == b % 10) {
                a = a / 10;
                b = b / 10;
                flag = true;
            } else {
                flag = false;
                break;
            }
        }
        if (flag == true) cout << "Yes!" << endl;
        else cout << "No!" << endl;
    }

    return 0;
}