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Commit 031f2c5

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add LeetCode 59. 螺旋矩阵 II
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![](https://imgconvert.csdnimg.cn/aHR0cHM6Ly9jZG4uanNkZWxpdnIubmV0L2doL2Nob2NvbGF0ZTE5OTkvY2RuL2ltZy8yMDIwMDgyODE0NTUyMS5qcGc?x-oss-process=image/format,png)
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>仰望星空的人,不应该被嘲笑
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## 题目描述
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给定一个正整数 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正方形矩阵。
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示例:
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```css
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输入: 3
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输出:
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[
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[ 1, 2, 3 ],
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[ 8, 9, 4 ],
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[ 7, 6, 5 ]
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]
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```
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来源:力扣(LeetCode)
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链接:https://leetcode-cn.com/problems/spiral-matrix-ii
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著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。
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## 解题思路
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按照螺旋矩阵模拟即可,先从左到右,在从上到下,再从右到左,再从下到上。
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每次进行`cur++`操作,直到累加到`total`为止。最后返回二维数组即可(没想到 `js`二维数组也是这样方便...)
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```javascript
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/**
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* @param {number} n
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* @return {number[][]}
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*/
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var generateMatrix = function(n) {
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let top = 0, bottom =n-1
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let left = 0, right = n-1
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let res = []
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for(let i=0;i<n;i++) res[i] = []
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let cur = 1, total = n*n
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while(cur<=total){
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for(let i=left;i<=right;i++) res[top][i] = cur++ // 从左到右
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top++
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for(let i=top;i<=bottom;i++) res[i][right] = cur++ // 从上到下
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right--
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for(let i=right;i>=left;i--) res[bottom][i] = cur++ // 从右到左
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bottom--
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for(let i=bottom;i>=top;i--) res[i][left] = cur++ // 从下到上
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left++
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}
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return res
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};
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```
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## 最后
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文章产出不易,还望各位小伙伴们支持一波!
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往期精选:
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<a href="https://github.com/Chocolate1999/Front-end-learning-to-organize-notes">小狮子前端の笔记仓库</a>
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<a href="https://yangchaoyi.vip/">访问超逸の博客</a>,方便小伙伴阅读玩耍~
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![](https://img-blog.csdnimg.cn/2020090211491121.png#pic_center)
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```javascript
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学如逆水行舟,不进则退
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```
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