463. 岛屿的周长

[mentaLwz]

class Solution:
    def islandPerimeter(self, grid: List[List[int]]) -> int:

        length = 0
        for i, e in enumerate(grid):
            for j, f in enumerate(grid[i]):
                curl = 0
                if grid[i][j]:
                    
                    if i -1 >= 0:
                        if grid[i-1][j]:
                            pass
                        else:
                            curl += 1
                    else:
                        curl += 1
                    if i + 1 < len(grid):
                        if grid[i + 1][j]:
                            pass
                        else:
                            curl += 1
                    else:
                        curl += 1
                    if j - 1 >= 0:
                        if grid[i][j - 1]:
                            pass
                        else:
                            curl += 1
                    else:
                        curl += 1
                    if j + 1 < len(e):
                        if grid[i][j + 1]:
                            pass
                        else:
                            curl += 1
                    else:
                        curl += 1
                length += curl
        return length