[Leetcode] Word Search

Source: Internet
Author: User

Word Search

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 is those horizontally or V Ertically neighboring. The same letter cell is used more than once.

For example,
Given Board =

[  ["ABCE"],  ["SFCs"],  ["Adee"]]
Word= "ABCCED", returns true,
Word= "SEE", returns true,
Word= "ABCB", returns false. Idea: DFS algorithm. Note: Because each character can only match once, the match succeeds in placing the character as a useless character, such as ' # ', and then continues to match the next character.
classsolution{ Public: Solution (): IsTrue (false) {}Private:  voidDFS (vector<vector<Char> > &board,stringWordintXintYintindex) {    if(Index = =word.size ()) {IsTrue=true; return; }        if(isTrue)return; if(X <0|| x >= board.size ())return; if(Y <0|| Y >= board[0].size ())return; if(Board[x][y]! = Word[index])return; Board[x][y]='#'; DFS (board, Word, x-1, Y, index+1); DFS (board, Word, x+1, Y, index+1); DFS (board, Word, x, y-1, index+1); DFS (board, Word, x, y+1, index+1); Board[x][y]=Word[index]; } Public:  BOOLexist (vector<vector<Char> > &board,stringword) {    if(Board.empty () | | board[0].empty ())return false; IsTrue=false; intindex =0;  for(intI=0; I<board.size (); i++)    {       for(intj=0; j<board[0].size (); J + +)      {        if(!isTrue) DFS (board, Word, I, J, index); }    }    returnisTrue; }Private:  BOOLisTrue;};

[Leetcode] Word Search

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