close
https://onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=2724
#include <iostream>
using namespace std;
int main(){
int a, b, c, d;
while((cin >> a >> b >> c >> d)){
if(a == b && b == c && c == d && d == 0)
break;
else if(a > c || (a == c && b > d))
cout << 1440 - ((60 * a + b) - (60 * c + d)) << endl;
else
cout << (60 * c + d) - (60 * a + b) << endl;
}
return 0;
}
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