#include <bits/stdc++.h> using namespace std; int main() { for(int i = 1000;i <= 9999;i++) { int ge = i % 10; int shi = i / 10 % 10; int bai = i / 100 % 10; int qian = i / 1000; int yi = ge + shi * 10; int er = bai + qian * 10; if((yi + er) * (yi + er) == i) { cout<<i<<endl; } } return 0; }