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…
