diff --git a/check-if-n-and-its-double-exist/check-if-n-and-its-double-exist.cpp b/check-if-n-and-its-double-exist/check-if-n-and-its-double-exist.cpp
new file mode 100644
index 0000000..a023341
--- /dev/null
+++ b/check-if-n-and-its-double-exist/check-if-n-and-its-double-exist.cpp
@@ -0,0 +1,17 @@
+class Solution {
+public:
+    int getExistIndex(vector<int>& arr, int element){
+        for(int i = 0; i < arr.size(); i++){
+            if(arr[i] == element) return i;
+        }
+        return -1;
+    }
+    bool checkIfExist(vector<int>& arr) {
+        for(int i = 0; i < arr.size(); i++){
+            int j = getExistIndex(arr, arr[i]*2);
+            if(i!=j && j >= 0) return true;
+        }
+        return false;
+        
+    }
+};
\ No newline at end of file