Merge branch 'master' of https://github.com/azl397985856/leetcode

Author: lucifer

problems/79.word-search-en.md

@@ -120,8 +120,9 @@ Found match with word, return `True`.
 ```java
 public class LC79WordSearch {
   public boolean exist(char[][] board, String word) {
-    if (board == null || board.length == 0 || board[0].length == 0
-        || word == null || word.length() == 0) return true;
+    if (board == null || word == null) return false;
+    if (word.length() == 0) return true;
+    if (board.length == 0) return false;
     int rows = board.length;
     int cols = board[0].length;
     for (int r = 0; r < rows; r++) {
@@ -239,4 +240,4 @@ var exist = function(board, word) {
 ```
 
 ## References
-1. [Backtracking Wiki](https://www.wikiwand.com/en/Backtracking)
+1. [Backtracking Wiki](https://www.wikiwand.com/en/Backtracking)

problems/79.word-search.md

@@ -136,8 +136,9 @@ _Java Code_
 ```java
 public class LC79WordSearch {
   public boolean exist(char[][] board, String word) {
-    if (board == null || board.length == 0 || board[0].length == 0
-        || word == null || word.length() == 0) return true;
+    if (board == null || word == null) return false;
+    if (word.length() == 0) return true;
+    if (board.length == 0) return false;
     int rows = board.length;
     int cols = board[0].length;
     for (int r = 0; r < rows; r++) {