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",
->
returns true,
word = "SEE",
->
returns true,
word = "ABCB",
-> returns false.
超时，不想再耗时间了
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class
Solution {public: bool
exist(vector<vector<char> > &board, string word) { int
x = board.size(); int
y = board[0].size(); vector<vector<int>> map; for(int
i = 0 ; i < x; i++) { vector<int> n(y,0); map.push_back(n); } for(int
i = 0 ; i < x;i++) for(int
j = 0 ; j < y ;j++) { if(board[i][j] == word[0]) if(test(board, i,j,word,1,map)==1) return
1; } return
false; } bool
test(vector<vector<char> > &board,int
x, int
y,string word,int
index,vector<vector<int>> map ) { map[x][y] = 1; if(index == word.length())return
1; if(x -1 >=0 && board[x-1][y] == word[index] && map[x-1][y] != 1) { if(test(board,x-1,y,word,index+1,map)==1) return
1; } if(y -1 >=0 && board[x][y-1] == word[index]&& map[x][y-1] != 1) { if(test(board,x,y-1,word,index+1,map)==1)return
1; } if(x +1 <board.size() && board[x+1][y] == word[index]&& map[x+1][y] != 1) { if(test(board,x+1,y,word,index+1,map)==1)return
1; } if(y +1 <board[0].size() && board[x][y+1] == word[index]&& map[x][y+1] != 1) { if(test(board,x,y+1,word,index+1,map)==1)return
1; } return
0; }}; |
超时数据：
| Last executed input: | 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"oajgdkcokvfpdaslnmomrpgwitwdoku" |
原文：http://www.cnblogs.com/pengyu2003/p/3600082.html