289. Game of Life - medium 문제 According to the Wikipedia’s article: “The Game of Life, also known simply as Life, is a cellular automaton devised by the British mathematician John Horton Conway...

283. Move Zeroes - easy 문제 Given an array nums, write a function to move all 0’s to the end of it while maintaining the relative order of the non-zero elements. 제한사항 You must do this in-pla...

279. Perfect Squares - medium 문제 Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, …) which sum to n. 제한사항 입출력 예 Example 1: Input: n = 12...

230. Kth Smallest Element in a BST - medium 문제 Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. 제한사항 You may assume k is always valid, 1 ≤ k ...

22. Generate Parentheses - medium 문제 Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: [ "(...

215. Kth Largest Element in an Array - medium 문제 Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. 제...

142. Linked List Cycle II - medium 문제 Given a linked list, return the node where the cycle begins. If there is no cycle, return null. To represent a cycle in the given linked list, we use an i...

1315. Sum of Nodes with Even-Valued Grandparent - medium 문제 Given a binary tree, return the sum of values of nodes with even-valued grandparent. (A grandparent of a node is the parent of its p...

1277. Count Square Submatrices with All Ones - medium 문제 Given a m * n matrix of ones and zeros, return how many square submatrices have all ones. 제한사항 1 <= arr.length <= 300 1 <...

1207. Unique Number of Occurrences - easy 문제 Given an array of integers arr, write a function that returns true if and only if the number of occurrences of each value in the array is unique. 제...