Submission #3224277

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for( long long i = 0; i < n; i++)
#define erep(i, n) for( long long i = 1; i <= n; i++)


int main() {string s;
cin >> s;
long last = s.size() - 1;
string ans = "NO";
while(last >= 4){
  if(last >= 6){
    if(s.substr(last - 4, 5) == "dream") last = last - 5;
    else if(s.substr(last - 4, 5) == "erase") last = last - 5;
    else if(s.substr(last - 5, 6) == "eraser") last = last - 6;
    else if(s.substr(last - 6, 7) == "dreamer") last = last - 7;
    else break;
  }
  else if(last == 5){
    if(s.substr(last - 4, 5) == "dream") last = last - 5;
    else if(s.substr(last - 4, 5) == "erase") last = last - 5;
    else if(s.substr(last - 5, 6) == "eraser") last = last - 6;
    else break;
  }
  else if(last == 4){
    if(s.substr(last - 4, 5) == "dream") last = last - 5;
    else if(s.substr(last - 4, 5) == "erase") last = last - 5;
    else break;
  }

}
if(last == -1) ans = "YES";

// string x = "aiueo";
// x = x - 'ue';

cout << ans << endl;
  return 0;
 
}

Submission Info

Judge Result