[UVa] 11958 - Coming Home

#include <stdio.h>

int main()
{
    int test, bn, ch, cm, ah, am, dur, i, cur_time, arr_time, min_time, spend, kase=1;
    scanf("%d",&test);

    while (test--)
    {
        min_time = 1000000;

        scanf("%d %d:%d",&bn,&ch,&cm);

        cur_time = ch*60 + cm;

        for (i=0 ; i<bn ; i++)
        {
            scanf("%d:%d %d",&ah,&am,&dur);

            arr_time = ah*60 + am;

            if (arr_time<cur_time) spend = 1440 - cur_time + arr_time + dur;
            else spend = arr_time - cur_time + dur;

            if (min_time>spend) min_time = spend;
        }

        printf("Case %d: %d\n",kase++,min_time);
    }

    return 0;
}

[UVa] 11650 - Mirror Clock

Nice and fun! The only tricky case probably is a time that generated 0 hours, just make it 12 but keep the minute same. I don't know if handling for 24 hours time is needed but added that too.

#include <stdio.h>

int main()
{
    int tst, h, m, time;
    scanf("%d",&tst);
    while (tst--)
    {
        scanf("%d:%d",&h,&m);
        time = h*60 + m;
        if (time>720) time-=720;
        time = 720-time;

        h = (time/60);
        m = time%60;

        if (!h) h = 12;

        if (h<10)
            printf("0%d:",h);
        else
            printf("%d:",h);
        if (m<10)
            printf("0%d\n",m);
        else
            printf("%d\n",m);
    }
    return 0;
}