Submission #3556127

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Source Code Expand

#include<iostream>
#include<cmath>
#include<cstdlib>
#include<string>
#include<algorithm>
#include<vector>
#include<map>

int main() {
   int N;
   std::cin >> N;
   std::map<std::string, int> map;   
   bool flg = true;
   std::string tmp;
   char last;
   for (int i = 0; i < N; i++) {
      std::cin >> tmp;
      if (map[tmp] == 1) flg = false;
      else map[tmp] = 1;
      if (i == 0);
      else if (last != tmp[0]) flg = false;
      last = tmp[tmp.size()-1];
   }
   if (flg == false) std::cout << "No" << std::endl;
   else std::cout << "Yes" << std::endl;
   return 0;
}

Submission Info

Judge Result