문제 설명 Given a string containing digits from inclusive, return all possible letter combinations that the number could represent. Return the answer in any order. A mapping of digit to letters (just li…
문제 설명 Let’s play the minesweeper game (Wikipedia, online game)! You are given a 2D char matrix representing the game board. ‘M’ represents an unrevealed mine, ‘E’ represents an unrevealed empty squar…
문제 설명 Given the of a binary tree, check whether it is a mirror of itself (i.e., symmetric around its center). Example 1: img Example 2: img Constraints: The number of nodes in the tree is in the ran…
문제 설명 Maximum Depth of N-ary Tree Given a n-ary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Nary-T…
