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  1. #include <iostream>
  2.  
  3. typedef long long ll;
  4.  
  5. ll _modmul(ll a, ll b, ll mod) {
  6.   long double res = a;
  7.   res *= b;
  8.   ll c = ll(res / mod);
  9.   a *= b;
  10.   a -= c * mod;
  11.   a %= mod;
  12.   if (a < 0) a += mod;
  13.   return a;
  14. }
  15.  
  16. int main()
  17. {
  18.     ll a=333333333333333333LL;
  19.     ll b=555555555555555555LL;
  20.     ll mod=1000000007L;
  21.     a%=mod;
  22.     b%=mod;
  23.     ll res=_modmul(a,b,mod);
  24.     std::cout << res << std::endl;
  25. }
Success #stdin #stdout 0.01s 2724KB
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666667098
https://ideone.com/P8MWGt
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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