From e1fb8192f5544517f6dc8526d99b32485a1bb8cf Mon Sep 17 00:00:00 2001 From: "huangge1199@hotmail.com" Date: Thu, 16 Sep 2021 23:19:50 +0800 Subject: [PATCH] =?UTF-8?q?212:=E5=8D=95=E8=AF=8D=E6=90=9C=E7=B4=A2=20II?= =?UTF-8?q?=EF=BC=88=E6=8A=84=E5=AE=98=E7=BD=91=EF=BC=89?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../java/leetcode/editor/cn/WordSearchIi.java | 113 ++++++++++++++++++ src/main/java/leetcode/editor/cn/doc/all.json | 2 +- .../editor/cn/doc/content/WordSearchIi.md | 35 ++++++ 3 files changed, 149 insertions(+), 1 deletion(-) create mode 100644 src/main/java/leetcode/editor/cn/WordSearchIi.java create mode 100644 src/main/java/leetcode/editor/cn/doc/content/WordSearchIi.md diff --git a/src/main/java/leetcode/editor/cn/WordSearchIi.java b/src/main/java/leetcode/editor/cn/WordSearchIi.java new file mode 100644 index 0000000..fbc2a9d --- /dev/null +++ b/src/main/java/leetcode/editor/cn/WordSearchIi.java @@ -0,0 +1,113 @@ +//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 +// +// Related Topics 字典树 数组 字符串 回溯 矩阵 👍 531 👎 0 + +package leetcode.editor.cn; + +import java.util.*; + +//212:单词搜索 II +class WordSearchIi { + public static void main(String[] args) { + //测试代码 + Solution solution = new WordSearchIi().new Solution(); + } + + //力扣代码 + //leetcode submit region begin(Prohibit modification and deletion) + class Solution { + int[][] dirs = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}}; + + public List findWords(char[][] board, String[] words) { + Trie trie = new Trie(); + for (String word : words) { + trie.insert(word); + } + Set ans = new HashSet(); + for (int i = 0; i < board.length; ++i) { + for (int j = 0; j < board[0].length; ++j) { + dfs(board, trie, i, j, ans); + } + } + return new ArrayList(ans); + } + + public void dfs(char[][] board, Trie now, int i1, int j1, Set ans) { + if (!now.children.containsKey(board[i1][j1])) { + return; + } + char ch = board[i1][j1]; + now = now.children.get(ch); + if (!"".equals(now.word)) { + ans.add(now.word); + } + board[i1][j1] = '#'; + for (int[] dir : dirs) { + int i2 = i1 + dir[0], j2 = j1 + dir[1]; + if (i2 >= 0 && i2 < board.length && j2 >= 0 && j2 < board[0].length) { + dfs(board, now, i2, j2, ans); + } + } + board[i1][j1] = ch; + } + } + + class Trie { + String word; + Map children; + boolean isWord; + + public Trie() { + this.word = ""; + this.children = new HashMap(); + } + + public void insert(String word) { + Trie cur = this; + for (int i = 0; i < word.length(); ++i) { + char c = word.charAt(i); + if (!cur.children.containsKey(c)) { + cur.children.put(c, new Trie()); + } + cur = cur.children.get(c); + } + cur.word = word; + } + } +//leetcode submit region end(Prohibit modification and deletion) + +} \ No newline at end of file diff --git a/src/main/java/leetcode/editor/cn/doc/all.json b/src/main/java/leetcode/editor/cn/doc/all.json index 9dfdb26..1cdf088 100644 --- a/src/main/java/leetcode/editor/cn/doc/all.json +++ b/src/main/java/leetcode/editor/cn/doc/all.json @@ -1 +1 @@ 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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
    • +
+
Related Topics
  • 字典树
  • 数组
  • 字符串
  • 回溯
  • 矩阵

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