Wednesday 21 January 2015

power function

  1. ll power(ll a,ll b,ll mod){
  2. ll ans=1;
  3. while(b){
  4. if(b&1) ans=(ans*a)%mod;
  5. a=(a*a)%mod;
  6. b/=2;
  7. }
  8. return ans;
  9. }

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