16: Path in the matrix

Path in the matrix

Design a function to determine if there is a path containing a string in the matrix

public class Offer17 {

   public static void main(String[] args) {
       char[][]  data=  {
           {'a','s','d'},
           {'z','x','c'},
           {'q','w','e'},
       };
       char[] temp = new String("sxw").toCharArray();
       System.out.println(hasPath(data,temp));
   }

   /**
    * Backtracking
    */
   public static boolean hasPath(char[][] data,char[] word){
       // 1. Data source judgment
       if(data.length==0)return false;
       // 2. New record matrix
       boolean[][] temp = new boolean[data.length][data[0].length];
       // 3. Back
       for(int i=0;i<data.length;i++){
           for(int j=0;i<data[0].length;j++){
               if(dfs(data,temp,word,i,j,0))return true;
           }
       }

       return false;
   }

   public static boolean dfs(char[][] data,boolean[][] temp,char[] word,int i,int j,int index){
       // Problem
       if(i<0||i>=data.length||j<0||j>=data[0].length||temp[i][j]==true)return false;
       // Character does not match
       if(data[i][j]!=word[index])return false;
       // The following is a data matching situation
       if(index==word.length-1)return true;
       // Tag access
       temp[i][j] = true;
       boolean flag = dfs(data,temp,word,i+1,j,index+1)||
               dfs(data,temp,word,i-1,j,index+1)||
               dfs(data,temp,word,i,j+1,index+1)||
               dfs(data,temp,word,i,j-1,index+1);
       // Match failed, need to change the visited flag
       temp[i][j] = false;

       return flag;
   }
}

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