L1-043 阅览室

题目链接

注意算“平均阅读时间（以分钟为单位的精确到个位的整数时间）”时，要四舍五入，否则第5个测试用例无法通过

#include<iostream>
#include<string>
using namespace std;
typedef struct {
    
	bool tag;		//用于标记该数据项是否有效
	string time;
}One;
One one[1005];
int f(int x, int y) {
    	//四舍五入--->y/x
	y *= 10;
	y /= x;
	x = y % 10;
	if (x >= 5)	y += 10;
	return y /= 10;
}
int subtra(string x, string y) {
     //以分钟为单位，计算时间差---> x-y
	int x1 = stoi(x.substr(0, 2));
	int y1 = stoi(x.substr(3, 2));
	int x2 = stoi(y.substr(0, 2));
	int y2 = stoi(y.substr(3, 2));
	return x1 * 60 + y1 - (x2 * 60 + y2);
}
int main() {
    
	int N,ans1,ans2;
	int num;
	char ch;
	string time;

	cin >> N;
	ans1 = ans2 = 0;
	while (N) {
    
		cin >> num >> ch >> time;
		if (num == 0) {
    
			N--;
			if (ans1 == 0) {
    
				cout << "0 0" << endl;
			}
			else {
    
				ans2 = f(ans1, ans2);
				cout << ans1 << " " << ans2 << endl;
			}
			ans1 = ans2 = 0;
		}
		else {
    
			if (ch == 'S') {
    
				one[num].tag = true;
				one[num].time = time;
			}
			else {
    
				if (!one[num].tag)		continue;
				one[num].tag = false;
				ans1++;
				ans2 += subtra(time, one[num].time);
			}
		}
	}
	return 0;
}