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添加 0738.单调递增的数字.md Scala版本

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`@@ -246,7 +246,37 @@ function monotoneIncreasingDigits(n: number): number {`
`246`	`246`	```
`247`	`247`
`248`	`248`
	`249`	`+### Scala`
	`250`	`+`
	`251`	`+直接转换为了整数数组:`
	`252`	+```scala
	`253`	`+object Solution {`
	`254`	`+ import scala.collection.mutable`
	`255`	`+ def monotoneIncreasingDigits(n: Int): Int = {`
	`256`	`+ var digits = mutable.ArrayBuffer[Int]()`
	`257`	`+ // 提取每位数字`
	`258`	`+ var temp = n // 因为参数n 是不可变量所以需要赋值给一个可变量`
	`259`	`+ while (temp != 0) {`
	`260`	`+ digits.append(temp % 10)`
	`261`	`+ temp = temp / 10`
	`262`	`+ }`
	`263`	`+ // 贪心`
	`264`	`+ var flag = -1`
	`265`	`+ for (i <- 0 until (digits.length - 1) if digits(i) < digits(i + 1)) {`
	`266`	`+ flag = i`
	`267`	`+ digits(i + 1) -= 1`
	`268`	`+ }`
	`269`	`+ for (i <- 0 to flag) digits(i) = 9`
`249`	`270`
	`271`	`+ // 拼接`
	`272`	`+ var res = 0`
	`273`	`+ for (i <- 0 until digits.length) {`
	`274`	`+ res += digits(i) * math.pow(10, i).toInt`
	`275`	`+ }`
	`276`	`+ res`
	`277`	`+ }`
	`278`	`+}`
	`279`	+```
`250`	`280`
`251`	`281`	`-----------------------`
`252`	`282`	`<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>`

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