Leetcode刷题笔记

防止重复查找用finded矩阵记录是否查找过

class Solution {
public:
    int row=0;
    int col=0;
    int n_word=0;
    bool check(vector<vector<char>>& board,vector<vector<bool>>& finded,string &word,int i,int j,int k){
        // cout<
        if(board[i][j]!=word[k]||finded[i][j]==1){
            return 0;
        }
        finded[i][j]=1;
        if(k==n_word-1){
            return 1;
        }
        k++;
        bool a[4]={0,0,0,0};
        if(i-1>=0&&!finded[i-1][j]){
            // finded[i-1][j]=1;
            a[0]=check(board,finded,word,i-1,j,k);
            if(!a[0])finded[i-1][j]=0;
        }
        if(i+1<row&&!finded[i+1][j]){
            // finded[i+1][j]=1;
            a[1]=check(board,finded,word,i+1,j,k);
            if(!a[1])finded[i+1][j]=0;
        }
        if(j-1>=0&&!finded[i][j-1]){
            // finded[i][j-1]=1;
            a[2]=check(board,finded,word,i,j-1,k);
            if(!a[2])finded[i][j-1]=0;
        }
        if(j+1<col&&!finded[i][j+1]){
            // finded[i][j+1]=1;
            a[3]=check(board,finded,word,i,j+1,k);
            if(!a[3])finded[i][j+1]=0;
        }
        bool b=(a[0]||a[1]||a[2]||a[3])?1:0;
        // cout<
        return b;
    }
    bool exist(vector<vector<char>>& board, string word) {
        row=board.size();
        col=board[0].size();
        if(word.empty())return 1;
        n_word=word.size();
        if(row*col<n_word)return 0;
        for(int i=0;i<row;i++){
            for(int j=0;j<col;j++){
                if(board[i][j]==word[0]){
                    vector<vector<bool>> finded(row,vector<bool>(col,0));
                    // cout<<"大循环"<
                    if(check(board,finded,word,i,j,0))return 1;                   
                }

            }
        }
        return 0;
    }
};