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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. using ll = long long;
  4.  
  5. ll a,b,c;
  6. ll f(ll x){
  7.     return(a * x + x / b) % c;
  8. }
  9. int main(){
  10.     cin >> a >> b >> c;
  11.     ll r,t;
  12.     t = f(1);
  13.     r = f(f(1));
  14.  
  15.     while(r != t){
  16.         t = f(t);
  17.         r = f(f(r));
  18.     }
  19.  
  20.     ll ans1 = 0;
  21.     t = 1;
  22.  
  23.     while(r != t){
  24.         r = f(r);
  25.         t = f(t);
  26.         ans1++;
  27.     }
  28.  
  29.     ll ans2 = 1;
  30.     t = f(t);
  31.     while(r != t){
  32.         t = f(t);
  33.         ans2++;
  34.     }
  35.     cout << ans1 + ans2;
  36. }
  37.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/gyzjfW
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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