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添加59.螺旋矩阵II Ruby实现

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`‎problems/0059.螺旋矩阵II.md‎`

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`@@ -688,6 +688,58 @@ public class Solution {`
`688`	`688`	`}`
`689`	`689`	```
`690`	`690`
	`691`	`+### Ruby#:`
	`692`	+```ruby
	`693`	`+def generate_matrix(n)`
	`694`	`+ result = Array.new(n) { Array.new(n, 0) }`
	`695`	`+ #循环次数`
	`696`	`+ loop_times = 0`
	`697`	`+ #步长`
	`698`	`+ step = n - 1`
	`699`	`+ val = 1`
	`700`	`+`
	`701`	`+`
	`702`	`+ while loop_times < n / 2`
	`703`	`+ #模拟从左向右`
	`704`	`+ for i in 0..step - 1`
	`705`	`+ #行数不变,列数变`
	`706`	`+ result[loop_times][i+loop_times] = val`
	`707`	`+ val += 1`
	`708`	`+ end`
	`709`	`+`
	`710`	`+ #模拟从上到下`
	`711`	`+ for i in 0..step - 1`
	`712`	`+ #列数不变,行数变`
	`713`	`+ result[i+loop_times][n-loop_times-1] = val`
	`714`	`+ val += 1`
	`715`	`+ end`
	`716`	`+`
	`717`	`+ #模拟从右到左`
	`718`	`+ for i in 0..step - 1`
	`719`	`+ #行数不变,列数变`
	`720`	`+ result[n-loop_times-1][n-loop_times-i-1] = val`
	`721`	`+ val += 1`
	`722`	`+ end`
	`723`	`+`
	`724`	`+ #模拟从下到上`
	`725`	`+ for i in 0..step - 1`
	`726`	`+ #列数不变,行数变`
	`727`	`+ result[n-loop_times-i-1][loop_times] = val`
	`728`	`+ val += 1`
	`729`	`+ end`
	`730`	`+`
	`731`	`+ loop_times += 1`
	`732`	`+ step -= 2`
	`733`	`+ end`
	`734`	`+`
	`735`	`+ #如果是奇数,则填充最后一个元素`
	`736`	`+ result[n/2][n/2] = n**2 if n % 2`
	`737`	`+`
	`738`	`+ return result`
	`739`	`+`
	`740`	`+end`
	`741`	+```
	`742`	`+`
`691`	`743`	`<p align="center">`
`692`	`744`	`<a href="https://programmercarl.com/other/kstar.html" target="_blank">`
`693`	`745`	`<img src="../pics/网站星球宣传海报.jpg" width="1000"/>`

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