class Solution {
public:
bool func(vector<vector<char>>& board,vector<vector<bool>> &vis,int i,int j,int k,string &word)
{
int m=board[0].size();
int n=board.size();
if(k==word.length())
return true;
if(i<0||i>=n)
return false;
if(j<0||j>=m)
return false;
if(board[i][j]!=word[k]||vis[i][j]==true)
return false;
vis[i][j]=true;
bool t= func(board,vis,i,j+1,k+1,word)||func(board,vis,i,j-1,k+1,word)||
func(board,vis,i+1,j,k+1,word)||func(board,vis,i-1,j,k+1,word);
vis[i][j]=false;
return t;
}
bool exist(vector<vector<char>>& board, string word) {
int n=board.size();
int m=board[0].size();
vector<vector<bool>> vis(n,vector<bool>(m,false));//
bool t;
for(int i = 0; i < n; i++)
{
for(int j = 0; j < m; j++){
if(board[i][j] == word[0]){
t = func(board,vis,i,j,0,word);
if(t)
return true;
}
}
}
return false;
}
};
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