Create Word Search

Author: HarryWangATX

Word Search

@@ -0,0 +1,34 @@
+class Solution {
+    public boolean exist(char[][] board, String word) {
+        for(int i = 0; i<board.length; i++){
+            for(int j = 0; j<board[i].length; j++){
+                if(board[i][j] == word.charAt(0) && traverse(board, "", word, i, j)){
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+    public boolean traverse(char[][] board, String word, String real, int i, int j){
+        if(word.equals(real)){
+            return true;
+        }
+        if(word.length() != 0 && real.indexOf(word) < 0){
+            return false;
+        }
+        if(i<0 || i>=board.length || j<0 || j>=board[0].length){
+            return false;
+        }
+        if(board[i][j] == '0') return false;
+        char temp = board[i][j];
+        word+=temp+"";
+        board[i][j] = '0';
+        if(traverse(board, word, real, i, j-1)) return true;
+        if(traverse(board, word, real, i, j+1)) return true;
+        if(traverse(board, word, real, i-1, j)) return true;
+        if(traverse(board, word, real, i+1, j)) return true;
+        word = word.substring(0, word.length()-1);
+        board[i][j] = temp;
+        return false;
+    }
+}