单词搜索 II
212. 单词搜索 II (Hard)
给定一个 m x n
二维字符网格 board
和一个单词(字符串)列表 words
,找出所有同时在二维网格和字典中出现的单词。
单词必须按照字母顺序,通过 相邻的单元格 内的字母构成,其中“相邻”单元格是那些水平相邻或垂直相邻的单元格。同一个单元格内的字母在一个单词中不允许被重复使用。
示例 1:
输入:board = [["o","a","a","n"],["e","t","a","e"],["i","h","k","r"],["i","f","l","v"]], words = ["oath","pea","eat","rain"] 输出:["eat","oath"]
示例 2:
输入:board = [["a","b"],["c","d"]], words = ["abcb"] 输出:[]
提示:
m == board.length
n == board[i].length
1 <= m, n <= 12
board[i][j]
是一个小写英文字母1 <= words.length <= 3 * 104
1 <= words[i].length <= 10
words[i]
由小写英文字母组成words
中的所有字符串互不相同