第二题，代码没看出什么区别，通过80% ``` m = input() grid = [] for _ in xrange(m):     grid.append(raw_input().split())      color = [[0] * m for i in range(m)] res = 0 def dfs(i,j):     for ii,jj in [(i-1,j),(i+1,j),(i,j-1),(i,j+1)]:         if 0 <= ii < m and 0 <= jj < m and color[ii][jj] == 0 and grid[ii][jj] == '1':             color[ii][jj] = 1             dfs(ii,jj)              for i in range(m):     for j in range(m):         if color[i][j] == 0 and grid[i][j] == '1':             color[i][j] = 1             dfs(i,j)             res += 1 print res ```