leetcode 59. 螺旋矩阵 II

题目描述

代码：

class Solution {
public:vector<vector<int>> generateMatrix(int n) {vector<vector<int>> res(n,vector<int>(n,0));int num = 1;int len = n;int start = 0;while(len > 0){int row = start;int column = start;if(len==1){res[row][column] = num++;break;}start++;for(int i =0;i < len-1;i++){res[row][column++] = num++;}for(int i = 0;i < len-1;i++){res[row++][column] = num++;}for(int i = 0;i < len-1;i++){res[row][column--] = num++;}for(int i = 0;i < len-1;i++){res[row--][column] = num++;}len-=2;}return res;}
};