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Source : https://oj.leetcode.com/problems/word-search/","// Author : Hao Chen","// Date : 2014-07-19","","/********************************************************************************** ","* ","* Given a 2D board and a word, find if the word exists in the grid.","* ","* The word can be constructed from letters of sequentially adjacent cell, ","* where \"adjacent\" cells are those horizontally or vertically neighboring. ","* The same letter cell may not be used more than once.","* ","* For example,","* Given board = ","* ","* [","* [\"ABCE\"],","* [\"SFCS\"],","* [\"ADEE\"]","* ]","* ","* word = \"ABCCED\", -\u003e returns true,","* word = \"SEE\", -\u003e returns true,","* word = \"ABCB\", -\u003e returns false.","* ","* ","**********************************************************************************/","","#include \u003ciostream\u003e","#include \u003cvector\u003e","#include \u003cstring\u003e","using namespace std;","","bool exist(vector\u003cvector\u003cchar\u003e \u003e \u0026board, string word, int idx, int row, int col, vector\u003c vector\u003cint\u003e \u003e \u0026mask) {"," int i = row;"," int j = col;"," if (board[i][j] == word[idx] \u0026\u0026 mask[i][j]==0 ) {"," mask[i][j]=1;"," if (idx+1 == word.size()) return true;"," idx++;"," if (( i+1\u003cboard.size() \u0026\u0026 exist(board, word, idx, i+1, j, mask) ) ||"," ( i\u003e0 \u0026\u0026 exist(board, word, idx, i-1, j, mask) ) ||"," ( j+1\u003cboard[i].size() \u0026\u0026 exist(board, word, idx, i, j+1, mask) ) ||"," ( j\u003e0 \u0026\u0026 exist(board, word, idx, i, j-1, mask) ) )"," {"," return true;"," }"," mask[i][j]=0;"," }"," //if (board[i][j] != word[idx]) {"," // mask[i][j]=0;"," //}"," return false;","}","","bool exist(vector\u003cvector\u003cchar\u003e \u003e \u0026board, string word) {"," if (board.size()\u003c=0 || word.size()\u003c=0) return false;"," int row = board.size();"," int col = board[0].size();"," vector\u003c vector\u003cint\u003e \u003e mask;"," for(int i=0; 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