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  1.     #include <bits/stdc++.h>
  2.     using namespace std;
  3.  
  4.     int main() {
  5.     	int a,b,c,n;
  6.     	int left = n-a-b+c;
  7.     	if(left<=0||(a<c&&b<c)||(a!=0&&b<c)||(b!=0&&a<c))
  8.     	cout<<-1;
  9.     	else
  10.     	cout<<left;
  11.     	return 0;
  12.     }
Success #stdin #stdout 0s 4404KB
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stdin
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10 10 5 20
stdout
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-1
https://ideone.com/sb5z3k
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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