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