矩阵 II"/>
LeetCode 59 螺旋矩阵 II
给你一个正整数 n ,生成一个包含 1 到 n2 所有元素,且元素按顺时针顺序螺旋排列的 n x n 正方形矩阵 matrix 。
示例 1:
输入:n = 3
输出:[[1,2,3],[8,9,4],[7,6,5]]
示例 2:
输入:n = 1
输出:[[1]]
提示:
1 <= n <= 20
解题思路:
按层模拟
Spiral Matrix II (模拟法,设定边界,代码简短清晰) - 螺旋矩阵 II - 力扣(LeetCode)
Python代码:
class Solution:def generateMatrix(self, n: int) -> List[List[int]]:res = [[0] * n for _ in range(n)]left, right, up, down = 0, n - 1, 0, n - 1num = 1while num <= n * n:for i in range(left, right + 1):res[up][i] = numnum += 1up += 1for i in range(up, down + 1):res[i][right] = numnum += 1right -= 1for i in range(right, left - 1, -1):res[down][i] = numnum += 1down -= 1for i in range(down, up - 1, -1):res[i][left] = numnum += 1left += 1return res
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LeetCode 59 螺旋矩阵 II
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