Leetcde 59. Spiral Matrix II

Given a positive integer n, generate a square matrix filled with elements from 1 to n2 in spiral order.

Example:

Input: 3
Output:
[[ 1, 2, 3 ],[ 8, 9, 4 ],[ 7, 6, 5 ]
]

题目链接：https://leetcode.com/problems/spiral-matrix-ii/

思路：在我之前的Leetcode 54. Spiral Matrix一步一个坑的基础上，改一下就好了，不要太简单，看来坑踩了还是有好处的

class Solution {
public:vector<vector<int>> generateMatrix(int n) {vector<vector<int>> res;for(int i=0;i<n;i++){vector<int> tmp;for(int j=0;j<n;j++){tmp.push_back(0);}res.push_back(tmp);}int c=1;for(int i=0;i<=n/2;i++){for(int j=i;j<n-i;j++){if(res[i][j]==0){res[i][j]=c;c++;}}for(int j=i+1;j<n-i;j++){if(res[j][n-1-i]==0){res[j][n-1-i]=c;c++;} }for(int j=n-i-2;j>=i;j--){if(res[n-1-i][j]==0){res[n-1-i][j]=c;c++;}}for(int j=i+2;j<n-i;j++){if(res[n-j][i]==0){res[n-j][i]=c;c++;}   }}return res;}
};