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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. using ll = long long;
  5.  
  6. ll eg(ll a, ll b, ll &x, ll &y){
  7.     return b ? (eg(b, a % b, y, x), y -= a / b * x) : (x = 1, y = 0, a);
  8. }
  9.  
  10. int main() {
  11.     ios::sync_with_stdio(false);
  12.     cin.tie(nullptr);
  13.  
  14.     freopen("CHASE.INP","r",stdin);
  15.     freopen("CHASE.OUT","w",stdout);
  16.  
  17.     ll M, xh, xt, h, t;
  18.     cin >> M >> xh >> xt >> h >> t;
  19.  
  20.     ll A = (h - 2*t) % M;
  21.     ll B = (xt - xh) % M;
  22.  
  23.     A = (A + M) % M;
  24.     B = (B + M) % M;
  25.  
  26.     ll x, y, d = eg(A, M, x, y);
  27.  
  28.     if (B % d) return cout << -1, 0;
  29.  
  30.     ll mod = M / d;
  31.     cout << ((B / d) * (x % mod + mod) ) % mod;
  32. }
Success #stdin #stdout 0.01s 5276KB
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https://ideone.com/tVAWEf
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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