# -*- coding:utf-8 -*-
def init():
  global graph
  graph.append([-1,  -1, -1, -1, -1, -1,  -1])
  graph.append([-1,  0, 0, -1, 0, 0,  -1])
  graph.append([-1,  0, -1, 0, 0, 0,  -1])
  graph.append([-1,  0, -1, 0, -1, -1,  -1])
  graph.append([-1,  0, -1, 0, 0, 0,  -1])
  graph.append([-1,  0, 0, 0, -1, 0,  -1])
  graph.append([-1,  0, 0, 0, 0, 0,  -1])
  graph.append([-1,  -1, -1, -1, -1, -1,  -1])
#深度优先遍历
def deepFirstSearch( steps , x, y ):
  global graph
  current_step = steps + 1
  print(x, y, current_step )
  graph[x][y] = current_step
  next_step = current_step + 1
  '''
  遍历周围4个点:
    如果周围节点不是-1 说明 不是障碍 在此基础上：
        里面是0 说明没遍历过 我们把它修改成当前所在位置步数加1
        里面比当前的next_step大 说明不是最优方案 就修改它
        里面比当前next_step说明当前不是最优方案，不修改
  '''
  if not(x-1== 1 and y==1) and graph[x-1][y] != -1 and ( graph[x-1][y]>next_step or graph[x-1][y] ==0 ) : #左
    deepFirstSearch(current_step, x-1 , y )
  if not(x == 1 and y-1==1) and graph[x][y-1] != -1 and ( graph[x][y-1]>next_step or graph[x][y-1] ==0 ) : #上
    deepFirstSearch(current_step, x , y-1 )
  if not(x == 1 and y+1==1) and graph[x][y+1] != -1 and ( graph[x][y+1]>next_step or graph[x][y+1]==0 ) : #下
    deepFirstSearch(current_step, x , y+1 )
  if not(x+1== 1 and y==1) and graph[x+1][y] != -1 and ( graph[x+1][y]>next_step or graph[x+1][y]==0 ) : #右
    deepFirstSearch(current_step, x+1 , y )
if __name__ == "__main__":
  graph = []
  init()
  deepFirstSearch(-1,1,1)
  print(graph[1][5])