Language: C++

dreamerer#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define watch(x) cout<<"->"<<#x<<" : "<<x<<endl;
#define min3(a,b,c) min(a,min(b,c))
#define max3(a,b,c) max(a,max(b,c)) 
#define all(v) (v).begin(),(v).end()
typedef long long ll;
typedef unsigned long long llu;
const double PI = 2*acos(0.0);
map<pair<int,string>,bool> seen;
map<pair<int,string>,int> val;
bool solve(int idx, string s, string curr)
{
	if(seen[{idx,curr}])
		return val[{idx,curr}];
	if(curr.length()>s.length())
		return false;
	if(s==curr)
		return true;
	bool a = 0, b = 0;
	if(s[idx]=='d')
		return a = solve(idx+5,s,curr+"dream") || solve(idx+7,s,curr+"dreamer");
	if(s[idx]=='e')
		return b = solve(idx+5,s,curr+"erase") || solve(idx+6,s,curr+"eraser");
	return val[{idx,curr}]=(a||b),seen[{idx,curr}]=true;
}
signed main()
{
	//freopen("","r",stdin);
	//freopen("","w",stdout);
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	string s;
	cin>>s;
	if(solve(0,s,""))
		cout<<"YES"<<endl;
	else
		cout<<"NO"<<endl;
	return 0;
}

Compiler output:
a.cc:1:10: error: stray '#' in program
    1 | dreamerer#include <bits/stdc++.h>
      |          ^
a.cc:1:1: error: 'dreamerer' does not name a type
    1 | dreamerer#include <bits/stdc++.h>
      | ^~~~~~~~~
a.cc:10:21: error: 'acos' was not declared in this scope
   10 | const double PI = 2*acos(0.0);
      |                     ^~~~
a.cc:11:1: error: 'map' does not name a type
   11 | map<pair<int,string>,bool> seen;
      | ^~~
a.cc:12:1: error: 'map' does not name a type
   12 | map<pair<int,string>,int> val;
      | ^~~
a.cc:13:21: error: 'string' has not been declared
   13 | bool solve(int idx, string s, string curr)
      |                     ^~~~~~
a.cc:13:31: error: 'string' has not been declared
   13 | bool solve(int idx, string s, string curr)
      |                               ^~~~~~
a.cc: In function 'bool solve(int, int, int)':
a.cc:15:12: error: 'seen' was not declared in this scope
   15 |         if(seen[{idx,curr}])
      |            ^~~~
a.cc:16:24: error: 'val' was not declared in this scope
   16 |                 return val[{idx,curr}];
      |                        ^~~
a.cc:17:17: error: request for member 'length' in 'curr', which is of non-class type 'int'
   17 |         if(curr.length()>s.length())
      |                 ^~~~~~
a.cc:17:28: error: request for member 'length' in 's', which is of non-class type 'int'
   17 |         if(curr.length()>s.length())
      |                            ^~~~~~
a.cc:22:13: error: invalid types 'int[int]' for array subscript
   22 |         if(s[idx]=='d')
      |             ^
a.cc:23:46: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
   23 |                 return a = solve(idx+5,s,curr+"dream") || solve(idx+7,s,curr+"dreamer");
      |                                          ~~~~^~~~~~~~
      |                                              |
      |                                              const char*
a.cc:13:38: note:   initializing argument 3 of 'bool solve(int, int, int)'
   13 | bool solve(int idx, string s, string curr)
      |                               ~~~~~~~^~~~
a.cc:23:77: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
   23 |                 return a = solve(idx+5,s,curr+"dream") || solve(idx+7,s,curr+"dreamer");
      |                                                                         ~~~~^~~~~~~~~~
      |                                                                             |
      |                                                                             const char*
a.cc:13:38: note:   initializing argument 3 of 'bool solve(int, int, int)'
   13 | bool solve(int idx, string s, string curr)
      |                               ~~~~~~~^~~~
a.cc:24:13: error: invalid types 'int[int]' for array subscript
   24 |         if(s[idx]=='e')
      |             ^
a.cc:25:46: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
   25 |                 return b = solve(idx+5,s,curr+"erase") || solve(idx+6,s,curr+"eraser");
      |                                          ~~~~^~~~~~~~
      |                                              |
      |                                              const char*
a.cc:13:38: note:   initializing argument 3 of 'bool solve(int, int, int)'
   13 | bool solve(int idx, string s, string curr)
      |                               ~~~~~~~^~~~
a.cc:25:77: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
   25 |                 return b = solve(idx+5,s,curr+"erase") || solve(idx+6,s,curr+"eraser");
      |                                                                         ~~~~^~~~~~~~~
      |                                                                             |
      |                                                                             const char*
a.cc:13:38: note:   initializing argument 3 of 'bool solve(int, int, int)'
   13 | bool solve(int idx, string s, string curr)
      |                               ~~~~~~~^~~~
a.cc:26:16: error: 'val' was not declared in this scope
   26 |         return val[{idx,curr}]=(a||b),seen[{idx,curr}]=true;
      |                ^~~
a.cc:26:39: error: 'seen' was not declared in this scope
   26 |         return val[{idx,curr}]=(a||b),seen[{idx,curr}]=true;
      |                                       ^~~~
a.cc: In function 'int main()':
a.cc:32:9: error: 'ios_base' has not been declared
   32 |         ios_base::sync_with_stdio(0);
      |         ^~~~~~~~
a.cc:33:9: error: 'cin' was not declared in this scope
   33 |         cin.tie(0);
      |         ^~~
a.cc:34:9: error: 'cout' was not declared in this scope
   34 |         cout.tie(0);
      |         ^~~~
a.cc:35:9: error: 'string' was not declared in this scope
   35 |         string s;
      |         ^~~~~~
a.cc:36:14: error: 's' was not declared in this scope
   36 |         cin>>s;
      |              ^