PAT a1124题解

#include<iostream>  #include<map>  #include<vector>  #include<string>  using namespace std;  int M, N, S;  map<string, bool> msb;  vector<string> vs;  int main()  {      scanf("%d%d%d", &M, &N, &S);      vs.push_back(" ");      string s;      for (int i = 0; i < M; i++)      {          cin >> s;          vs.push_back(s);          msb[s] = false;      }      int i = S;      if (vs.size() - 1 < S)      {          cout << "Keep going..." << endl; return 0;      }      while (i <= M)      {          if (msb[vs[i]] == false)          {              cout << vs[i] << endl;              msb[vs[i]] = true;              i += N;          }          else {              i++;          }      }      return 0;  }