UVA_10281_Average_Speed

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <list>
#include <vector>
#include <map>
#include <set>
#include <sstream>
#include <stdlib.h>
#include <cmath>
#define LL unsigned long long
using namespace std;

int main(){
    char buffer[1000];
    int n, time = 0, now; //
    int hour, min, sec, speed=0, newSpeed;
    double distance=0;

    while (gets(buffer)){
        n = sscanf(buffer, "%d:%d:%d %d", &hour, &min, &sec, &newSpeed);
        now = hour * 3600 + min * 60 + sec;

        distance += (now - time) * speed;
        time = now;

        if (n == 3)
            printf("%02d:%02d:%02d %.2lf km\n", hour, min, sec, distance/3600);
        else if (n == 4)
            speed = newSpeed;
    }

    return 0;
}