#include<iostream> #include<vector> #include<algorithm> using namespace std; int main() {     int N, A, X;     while (!cin.eof()) {         cin >> N >> A >> X;         int tmp;         int time = 0;         int sum = 0;         for (int i = 0; i < N; ++i) {             cin >> tmp;             sum += tmp;         }         int coffeTime = A * X * 60;         if (coffeTime > sum) {             time = ceil((double)(sum) / (double)A);         }         else {             time = sum - coffeTime + ceil((double)(sum) / (double)A);         }         if (time > 480) {             cout << 0;         }         else {             cout << time;         }     }     return 0; } 这样做有什么问题吗？大佬。咋感觉是输入输出的问题