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Solve 491. Non-decreasing Subsequences

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	`1`	`+class Solution {`
	`2`	`+`
	`3`	`+ private fun findSubsequences(current: Int, currentSubsequence: MutableList<Int>, subsequences: MutableSet<List<Int>>, nums: IntArray) {`
	`4`	`+ if (currentSubsequence.size > 1) {`
	`5`	`+ subsequences.add(currentSubsequence.toList())`
	`6`	`+ }`
	`7`	`+`
	`8`	`+ for (i in current until nums.size) {`
	`9`	`+ if (!currentSubsequence.isEmpty() && nums[i] < currentSubsequence.last()) {`
	`10`	`+ continue`
	`11`	`+ }`
	`12`	`+`
	`13`	`+ currentSubsequence.add(nums[i])`
	`14`	`+ findSubsequences(i + 1, currentSubsequence, subsequences, nums)`
	`15`	`+ currentSubsequence.removeAt(currentSubsequence.size - 1)`
	`16`	`+ }`
	`17`	`+ }`
	`18`	`+`
	`19`	`+ fun findSubsequences(nums: IntArray): List<List<Int>> {`
	`20`	`+ val subsequences = mutableSetOf<List<Int>>()`
	`21`	`+ findSubsequences(0, mutableListOf(), subsequences, nums)`
	`22`	`+`
	`23`	`+ return subsequences.toList()`
	`24`	`+ }`
	`25`	`+`
	`26`	`+}`

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