1015: 计算时间间隔

# include <stdio.h>
# include <math.h>

int main(){
    int a, b, c;
    int d, e, f;

    scanf("%d:%d:%d\n", &a, &b, &c);
    scanf("%d:%d:%d", &d, &e, &f);

    int res_1 = a*60*60 + b*60 + c;
    int res_2 = d*60*60 + e*60 + f;
    
    printf("%d\n", res_2 - res_1);

    return 0;
}