Time: 751 ms (7.32%), Space: 97.1 MB (19.16%) - LeetHub

Author: subhamengine

0380-insert-delete-getrandom-o1/0380-insert-delete-getrandom-o1.cpp

@@ -0,0 +1,47 @@
+class RandomizedSet {
+public:
+    unordered_map<int,int>mp;
+    vector<int>arr;
+    
+    RandomizedSet() {
+        
+    }
+    
+    bool insert(int val) {
+        if(mp.count(val)){
+            return false;
+        }
+        else{
+            arr.push_back(val);
+            mp[val] = arr.size()-1;
+        }
+        return true;
+    }
+    
+    bool remove(int val) {
+        if(mp.count(val)){
+            int idx = mp[val];
+            int last = arr.back();
+            arr[idx] = last;
+            arr.pop_back();
+            mp[last] = idx;
+            mp.erase(val);
+            return true;
+        }
+        return false;
+        
+    }
+    
+    int getRandom() {
+        
+        return arr[rand()%arr.size()];
+    }
+};
+
+/**
+ * Your RandomizedSet object will be instantiated and called as such:
+ * RandomizedSet* obj = new RandomizedSet();
+ * bool param_1 = obj->insert(val);
+ * bool param_2 = obj->remove(val);
+ * int param_3 = obj->getRandom();
+ */