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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. typedef long long ll;
  4. using namespace std;
  5. void Code_By_Mohamed_Khaled() {
  6.     ios_base::sync_with_stdio(false);
  7.     cin.tie(nullptr);
  8.     cout.tie(nullptr);
  9. }
  10. ll Sum_of_range(ll l, ll r) {
  11.     if (l > r) return 0;
  12.     return r * (r + 1) / 2 - l * (l - 1) / 2;
  13. }
  14. ll mod=1e9+7;
  15. ll add(ll a, ll b) {return ((b % mod) + (a % mod)) % mod;}
  16. ll mul(ll a, ll b) {return ((b % mod) * (a % mod)) % mod;}
  17. int main() {
  18.     Code_By_Mohamed_Khaled();
  19.     // (A+B)%C=D           if D>=C the no solution
  20.     // i have two test cases  A+B==D  or A+B==D+C  then get A from to equations and minimize answer
  21.     // if A==0 A should be positive then A=C
  22.     long long b,c,d;cin>>b>>c>>d;
  23.     if (d>=c) {
  24.         cout<<-1;
  25.         return 0;
  26.     }
  27.     long long a=(d-b+c)%c;
  28.     if (a==0)cout<<c;
  29.     else cout<<a;
  30.     return 0;
  31. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/KlWPAP
language:
C++ (gcc 8.3)
created:
17 hours ago
visibility:
public

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