题目描述
输入一个矩阵,按照从外向里以顺时针的顺序依次打印出每一个数字,例如,如果输入如下4 X 4矩阵: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 则依次打印出数字1,2,3,4,8,12,16,15,14,13,9,5,6,7,11,10.
# -*- coding:utf-8 -*- class Solution: # matrix类型为二维列表,需要返回列表 def printMatrix(self, matrix): # write code here if not matrix: return None rows = len(matrix) cols = len(matrix[0]) start = 0 result = [] while rows > 2*start and cols > 2*start: endx = rows-1-start endy = cols-1-start for i in range(start,endy+1): result.append(matrix[start][i]) if start < endx: for i in range(start+1,endx+1): result.append(matrix[i][endy]) if start < endx and start < endy: for i in range(endy-1,start-1,-1): result.append(matrix[endx][i]) if start < endx-1 and start < endy: for i in range(endx-1,start,-1): result.append(matrix[i][start]) start += 1 return result