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a guest Mar 1st, 2016 366 Never
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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. int main() {
  6.     int N, P; cin >> N >> P;
  7.     int64_t apples = 0;
  8.     for(int i=0; i<N; ++i) {
  9.         string s; cin >> s;
  10.         if (s == "halfplus") apples |= (1LL << i);
  11.     }
  12.     // __builtin_popcount counts bits set to 1 in the binary representation of the number
  13.     int64_t gifts = __builtin_popcountll(apples);
  14.     cout << apples * P - gifts * P / 2 << endl;
  15.     return 0;
  16. }
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