leetcode

문제 설명You have a set which contains all positive integers [1, 2, 3, 4, 5, ...].Implement the SmallestInfiniteSet class:SmallestInfiniteSet() Initializes the SmallestInfiniteSet object to contain all positive integers.int popSmallest() Removes and returns the smallest integer contained in the infinite set.void addBack(int num) Adds a positive integer num back into the infinite set, if it is not al..