L1-043 阅览室

#include <stdio.h>
#include <string.h>

#define MAX_BOOKS 1001  // 书号最大为1000

typedef struct {
    int start_hh, start_mm;  // 借书时间
    int end_hh, end_mm;      // 还书时间
    int is_borrowed;         // 标记是否被借出
} BookRecord;

// 计算时间差（分钟）
int time_diff(int start_hh, int start_mm, int end_hh, int end_mm) {
    return (end_hh - start_hh) * 60 + (end_mm - start_mm);
}

int main() {
    int N;
    scanf("%d", &N);  // 输入天数

    for (int day = 0; day < N; day++) {
        BookRecord books[MAX_BOOKS] = {0};  // 初始化每天的借阅记录
        int book_id, hh, mm;
        char key;
        int total_borrows = 0;  // 当天借书次数
        int total_time = 0;     // 当天总阅读时间

        while (1) {
            scanf("%d %c %d:%d", &book_id, &key, &hh, &mm);  // 输入操作记录
            if (book_id == 0) {  // 如果书号为0，表示一天结束
                break;
            }

            if (key == 'S') {  // 借书操作
                books[book_id].start_hh = hh;
                books[book_id].start_mm = mm;
                books[book_id].is_borrowed = 1;  // 标记为已借出
            } else if (key == 'E' && books[book_id].is_borrowed==1) {  // 还书操作且之前有借书记录
                books[book_id].end_hh = hh;
                books[book_id].end_mm = mm;
                total_time += time_diff(books[book_id].start_hh, books[book_id].start_mm,
                                        books[book_id].end_hh, books[book_id].end_mm);
                total_borrows++;
                books[book_id].is_borrowed = 0;  // 标记为已归还
            }
        }

        // 输出当天的借书次数和平均阅读时间
        if (total_borrows == 0) {
            printf("0 0\n");
        } else {
            printf("%d %.0lf\n", total_borrows,(double) total_time / total_borrows);//实现四舍五入
        }
    }

    return 0;
}