Time: 7 ms (7.25%), Space: 15 MB (10.05%) - LeetHub

Author: MishkatIT

1346-check-if-n-and-its-double-exist/1346-check-if-n-and-its-double-exist.cpp

@@ -0,0 +1,15 @@
+class Solution {
+public:
+    bool checkIfExist(vector<int>& arr) {
+        map<int, int> mp;
+        for (auto& i : arr) {
+            mp[i]++;
+        }
+        for (auto& i : arr) {
+            if (i == 0) {
+                if (mp[0] > 1) return true;
+            } else if(mp.find(i * 2) != mp.end()) return true;
+        }
+        return false;
+    }
+};