Problem Type : Simple Math
#include <stdio.h>
int main()
{
int h1,m1,h2,m2,w1,w2;
while(scanf("%d %d %d %d",&h1,&m1,&h2,&m2))
{
if(h1==0 && m1==0 && h2==0 && m2==0)
break;
w1=(h1*60)+m1;
w2=(h2*60)+m2;
if(w2<w1)
w2=w2+1440;
printf("%d\n",w2-w1);
}
return 0;
}
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