Changed the folder structure of codeforces problemsets

codeforces/problemsets/chatroom/a.cpp

@@ -0,0 +1,32 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main(){
+    ios::sync_with_stdio(0);
+    cin.tie(0);
+
+    string s;
+    cin >> s;
+
+    string hello = "olleh";
+
+    for(char& c : s){
+        if(c == hello.back()){
+            hello.pop_back();
+        }
+        if(hello.empty()){
+            break;
+        }
+    }
+
+    if(hello.empty()){
+        cout << "YES";
+    } else{
+        cout << "NO";
+    }
+
+    cout << flush;
+
+    return 0;
+}