下面程序的输出为（ ）。
#include <iostream>using namespace std; int main() { const int N = 30; int cnt = 0; for (int a = 1; a <= N; a++) for (int b = a; a + b <= N; b++) for (int c = b; a + b + c <= N; c++) if (a * a + b * b == c * c) cnt++; cout << cnt << endl; return 0;}