hdu 1036 水题

这种水题都PE了好几次，真是不应该啊！

/*
 * hdu1036/linux.cpp
 * Created on: 2011-8-31
 * Author    : ben
 */
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <algorithm>
using namespace std;

void work();
int main() {
#ifndef ONLINE_JUDGE
    freopen("data.in", "r", stdin);
#endif
    work();
    return 0;
}

void work() {
    int N, t, time, th, tm, ts;
    double d;
    bool flag;
    scanf("%d %lf", &N, &d);
    while (scanf("%d", &t) == 1) {
        time = 0;
        flag = false;
        for (int i = 0; i < N; i++) {
            if (scanf(" %d:%d:%d", &th, &tm, &ts) == 3) {
                time += ts;
                time += tm * 60;
                time += th * 3600;
            } else {
                scanf(":--:--");
                flag = true;
            }
        }
        if (flag) {
            printf("%3d: -\n", t);
            continue;
        }
        time = (time / d + 0.5);
        ts = time % 60;
        tm = time / 60;
        printf("%3d: %d:%02d min/km\n", t, tm, ts);
    }
}