comefrom: <doocs>0463.Island Perimeter_1.py
code: def islandPerimeter( grid: List[List[int]]) -> int:
      m, n = len(grid), len(grid[0])
      ans = 0
      for i in range(m):
          for j in range(n):
              if grid[i][j] == 1:
                  ans += 4
                  if i < m - 1 and grid[i + 1][j] == 1:
                      ans -= 2
                  if j < n - 1 and grid[i][j + 1] == 1:
                      ans -= 2
      return ans
masked: def sample_funcname ( var_0 : List [ List [ int ] ] ) -> int :
      var_4 , var_6 = len ( var_0 ) , len ( var_0 [ 0 ] )
      var_7 = 0
      for var_9 in range ( var_4 ) :
          for var_10 in range ( var_6 ) :
              if var_0 [ var_9 ] [ var_10 ] == 1 :
                  var_7 += 4
                  if var_9 < var_4 - 1 and var_0 [ var_9 + 1 ] [ var_10 ] == 1 :
                      var_7 -= 2
                  if var_10 < var_6 - 1 and var_0 [ var_9 ] [ var_10 + 1 ] == 1 :
                      var_7 -= 2
      return var_7
  