题解 | 小红的删数字

#include  <cstdio>
#include  <string>
#include  <stdexcept>

std::string   x;
int  cnt[3] = {},  sum;

inline  std::string  get ()  {
      std::string  read;
      int getChar = getchar();
      while (getChar != '\n' && getChar != EOF) read += static_cast<char>(getChar) , getChar = getchar();
      if (read.empty()) throw std::runtime_error("读取无效");
      return read;
}

void  solve ()  {
      x = get();
      for (char digit : x)
            if (digit != '0') cnt[(digit - '0') % 3] ++, sum = (sum + digit - '0') % 3;
      if (!cnt[sum]) puts("yukari");
      else {
            cnt[sum] -- ;
            if (cnt[0] && cnt[1] == cnt[2]) puts("kou");
            else puts("yukari");
      }

}

int main() { solve(); }