题解 | 百鸡问题

#include <iostream>
#include <cmath>
using namespace std;

int main() {
    int i, j, k, sum, n1, n2;
    while (cin >> sum) {
        for (i = 0; i <= 100; i++) {
            for (j = 0; j <= 100; j++) {
                for (k = 0; k <= 100; k++) {
                	// 1. round(k/3.0) 四舍五入  
					// 2. 必须用3.0，否则用3会自动舍弃取整 
                    if (( sum >= 5 * i + 3 * j + round(k/3.0) ) && (100 == i + j + k ))
                        cout << "x=" <<i<<",y="<< j << ",z=" << k << endl;
                }
            }
        }
    }
}