//Implement the RandomizedSet class:
//
// 
// RandomizedSet() Initializes the RandomizedSet object. 
// bool insert(int val) Inserts an item val into the set if not present. 
//Returns true if the item was not present, false otherwise. 
// bool remove(int val) Removes an item val from the set if present. Returns 
//true if the item was present, false otherwise. 
// int getRandom() Returns a random element from the current set of elements (
//it's guaranteed that at least one element exists when this method is called). 
//Each element must have the same probability of being returned. 
// 
//
// You must implement the functions of the class such that each function works 
//in average O(1) time complexity. 
//
// 
// Example 1: 
//
// 
//Input
//["RandomizedSet", "insert", "remove", "insert", "getRandom", "remove", 
//"insert", "getRandom"]
//[[], [1], [2], [2], [], [1], [2], []]
//Output
//[null, true, false, true, 2, true, false, 2]
//
//Explanation
//RandomizedSet randomizedSet = new RandomizedSet();
//randomizedSet.insert(1); // Inserts 1 to the set. Returns true as 1 was 
//inserted successfully.
//randomizedSet.remove(2); // Returns false as 2 does not exist in the set.
//randomizedSet.insert(2); // Inserts 2 to the set, returns true. Set now 
//contains [1,2].
//randomizedSet.getRandom(); // getRandom() should return either 1 or 2 
//randomly.
//randomizedSet.remove(1); // Removes 1 from the set, returns true. Set now 
//contains [2].
//randomizedSet.insert(2); // 2 was already in the set, so return false.
//randomizedSet.getRandom(); // Since 2 is the only number in the set, 
//getRandom() will always return 2.
// 
//
// 
// Constraints: 
//
// 
// -2³¹ <= val <= 2³¹ - 1 
// At most 2 * 10⁵ calls will be made to insert, remove, and getRandom. 
// There will be at least one element in the data structure when getRandom is 
//called. 
// 
// Related Topics Array Hash Table Math Design Randomized 👍 4585 👎 256


package leetcodeProblem.leetcode.editor.en

import kotlin.random.Random

class InsertDeleteGetrandomO1 {
    fun solution() {
    }

    //below code will be used for submission to leetcode (using plugin of course)
    //leetcode submit region begin(Prohibit modification and deletion)
    class RandomizedSet() {
        private val randomStorage = hashMapOf<Int, Int>()

        fun insert(`val`: Int): Boolean {
            if (randomStorage[`val`] == null) {
                randomStorage[`val`] = `val`
                return true
            }
            return false
        }

        fun remove(`val`: Int): Boolean {
            if (randomStorage[`val`] == null) {
                return false
            }
            randomStorage.remove(`val`)
            return true
        }

        fun getRandom(): Int {
            return randomStorage[randomStorage.keys.random()] ?: 0
        }

    }

    /**
     * Your RandomizedSet object will be instantiated and called as such:
     * var obj = RandomizedSet()
     * var param_1 = obj.insert(`val`)
     * var param_2 = obj.remove(`val`)
     * var param_3 = obj.getRandom()
     */
//leetcode submit region end(Prohibit modification and deletion)

}

fun main() {}
  

