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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4.  
  5. long long a, b, c;
  6.  
  7.  
  8. inline long long bin_mult(long long a, long long b, long long mod){
  9.     long long res = 0;
  10.     while(b){
  11.         if(b & 1){
  12.             res = (res + a) % mod;
  13.         }
  14.         a = (a + a) % mod;
  15.         b >>= 1;
  16.     }
  17.     return res;
  18. }
  19.  
  20. int main(){
  21.     ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  22.     cin >> a >> b >> c;
  23.     if(a < b){
  24.         swap(a, b);
  25.     }
  26.     cout << bin_mult(a, b, c) << endl;
  27. }
  28.  
Success #stdin #stdout 0s 16064KB
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https://ideone.com/lQeOt0
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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