ACM 11677 - Alarm Clock

#include <stdio.h>

int H1, M1, H2, M2, totalM;

int main()
{
    while (scanf("%d %d %d %d", &H1, &M1, &H2, &M2) == 4)
    {
        if (H1 == 0 && H2 == 0 && M1 == 0 && M2 == 0) break;
        if (H1 == H2 && M1 > M2 || H1 > H2) H2 += 24;
        totalM = (M2 >= M1? (M2 - M1) + (H2 - H1) * 60: (60-M1+M2) + (H2 - H1 - 1) * 60); 
        printf("%d\n", totalM);
    }
    return 0;
}

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