diff --git a/sets-STL-HR.cpp b/sets-STL-HR.cpp
new file mode 100644
index 0000000..94af5e2
--- /dev/null
+++ b/sets-STL-HR.cpp
@@ -0,0 +1,23 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+
+int main() {
+    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
+    int n, q, val;
+    set<int> s;
+    cin>>n;
+    for(int i=0;i<n;i++){
+        cin>>q>>val;
+        if(q == 1){
+            s.insert(val);
+        }
+        else if(q == 2){
+                s.erase(val);
+            }
+        else{
+            cout<<(s.find(val) == s.end() ? "No" : "Yes")<<endl;
+        }
+    }
+    return 0;
+}