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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6.   ios::sync_with_stdio(false);
  7.   cin.tie(0);
  8.   int a, b, c, n;
  9.   cin >> a >> b >> c >> n;
  10.   int x = (a - c) + (b - c) + c;
  11.   int p = n - x;
  12.   if(p <= 0 or x < 0 or a < c or b < c) {
  13.     cout << "-1" << "\n";
  14.     return 0;
  15.   }
  16.   cout << p << "\n";
  17.   return 0;
  18. }
Success #stdin #stdout 0s 4388KB
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-1
https://ideone.com/rmE0E1
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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