三个月算法进阶--day60

class Solution:
    def spiralOrder(self, matrix: List[List[int]]) -> List[int]:
        ans = []
        while matrix:
            ans.extend(matrix[0])
            matrix = list(zip(* matrix[1:]))[::-1]
        return ans

class Solution:
    def spiralOrder(self, matrix:[[int]]) -> [int]:
        if not matrix: return []
        l, r, t, b, res = 0, len(matrix[0]) - 1, 0, len(matrix) - 1, []
        while True:
            for i in range(l, r + 1): res.append(matrix[t][i]) # left to right
            t += 1
            if t > b: break
            for i in range(t, b + 1): res.append(matrix[i][r]) # top to bottom
            r -= 1
            if l > r: break
            for i in range(r, l - 1, -1): res.append(matrix[b][i]) # right to left
            b -= 1
            if t > b: break
            for i in range(b, t - 1, -1): res.append(matrix[i][l]) # bottom to top
            l += 1
            if l > r: break
        return res

class Solution:
    def spiralOrder(self, matrix: List[List[int]]) -> List[int]:
        if not matrix or not matrix[0]:
            return list()
        
        rows, columns = len(matrix), len(matrix[0])
        order = list()
        left, right, top, bottom = 0, columns - 1, 0, rows - 1
        while left <= right and top <= bottom:
            for column in range(left, right + 1):
                order.append(matrix[top][column])
            for row in range(top + 1, bottom + 1):
                order.append(matrix[row][right])
            if left < right and top < bottom:
                for column in range(right - 1, left, -1):
                    order.append(matrix[bottom][column])
                for row in range(bottom, top, -1):
                    order.append(matrix[row][left])
            left, right, top, bottom = left + 1, right - 1, top + 1, bottom - 1
        return order

visited = [[0] * col for _ in range(row)]