package snapchat;
/**
* Created by kangyue on 1/5/17.
*/
public class GoMyth {
public boolean go(int[][] matrix){
int row = matrix.length;
if(row == 0)return false;
int col = matrix[0].length;
for(int i = 0; i < row; i++){
for(int j = 0; j < col; j++){
if(matrix[i][j] == 1)return dfs(matrix,i,j,new boolean[row][col]);
}
}
return false;
}
public boolean dfs(int[][] matrix, int i, int j, boolean[][] visit){
if(matrix[i][j] == 9)return true;
visit[i][j] = true;
int row = matrix.length;
int col = matrix[0].length;
int[] dx = new int[]{1,-1,0,0};
int[] dy = new int[]{0,0,1,-1};
for(int k = 0; k < 4; k++){
int nx = i + dx[k];
int ny = j + dy[k];
if(nx >= 0 && nx < row && ny >= 0 && ny < col && matrix[nx][ny] != 5 && !visit[nx][ny]){
if(dfs(matrix,nx,ny,visit))return true;
}
}
return false;
}
public static void main(String[] args){
GoMyth gm = new GoMyth();
int[][] tester = new int[][]{{1,0,0,0,0},{0,0,0,5,0},{0,0,0,5,9}};
System.out.println(gm.go(tester));
}
}
[snap] go through myth
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