11677 - Alarm Clock

Author: Ismail Hosen

Daffodil International University

Problem Link

//Please follow from main function

	#include<bits/stdc++.h>
	using namespace std;
	int main()
	{
	// freopen("input.txt", "r", stdin);
	// freopen("output.txt", "w", stdout);
	int a, b, c, d, m, n;
	while(cin>>a>>b>>c>>d){
	if(a==0 && b==0 && c==0 && d==0)break;
	m=c-a;
	if(m<0){
	m=24+(c-a);
	}
	else if(m==0){
	if(b<d)m=0;
	else m=24;
	}
	n=d-b;
	if(n<0){
	n=60+(d-b);
	m--;
	}
	else if(n==0){
	n=0;
	}
	cout<<n+(m*60)<<endl;
	}
	return 0;
	}

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