#include <iostream> #include <cstdio> int Reverse(int x) { int revx = 0; while (x != 0) { revx = revx * 10 + x % 10; x = x / 10; } return revx; } int main() { for (int i = 0; i <= 256; i++) { if (Reverse(i * i) == i * i) { printf("%d\n", i); } } return 0; }