字符串

C++ 代码

#include <iostream>
#include <cstring>
#include <algorithm>

using namespace std;

bool check(int x)
{
    string s = to_string(x);
    string ss = to_string(x*x);
    return ss.substr(ss.size() - s.size()) == s;
}
int main()
{
    int n;
    while(cin>>n)
    {
        if(check(n))cout<<"Yes!"<<endl;
        else cout<<"No!"<<endl;
    }
    return 0;
}