标准化读入更加简洁快速！

#include<stdio.h>
#include<iostream>

int main() {
    int n, flag_of_ampm;
    int year, month, day;
    int hour, min, sec;
    char ampm[][3] = {"am", "pm"};
    scanf("%d", &n);
    while(n--) {
        scanf("%d/%d/%d-%d:%d:%d", &year, &month, &day, &hour, &min, &sec);

        if(hour >= 12) 
            flag_of_ampm = 1;
        else 
            flag_of_ampm = 0;

        if(hour == 0)
            hour = 12;
        else if(hour > 12)
            hour -= 12;

        printf("%02d/%02d/%04d-%02d:%02d:%02d%s\n", month, day, year, hour, min, sec, ampm[flag_of_ampm]);

    }

    system("pause");
    return 0;
}