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5.nextPermutation

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	`1`	`+def nextPermutation(arr):`
	`2`	`+ n = len(arr)`
	`3`	`+ pivot = -1`
	`4`	`+ for i in range(n - 2, -1, -1):`
	`5`	`+ if arr[i] < arr[i + 1]:`
	`6`	`+ pivot = i`
	`7`	`+ break`
	`8`	`+ if pivot == -1:`
	`9`	`+ arr.reverse()`
	`10`	`+ return`
	`11`	`+ for i in range(n - 1, pivot, -1):`
	`12`	`+ if arr[pivot] < arr[i]:`
	`13`	`+ arr[pivot], arr[i] = arr[i], arr[pivot]`
	`14`	`+ break`
	`15`	`+ left, right = pivot + 1, n - 1`
	`16`	`+ while left < right:`
	`17`	`+ arr[left], arr[right] = arr[right], arr[left]`
	`18`	`+ left += 1`
	`19`	`+ right -= 1`
	`20`	`+ return arr`
	`21`	`+`
	`22`	`+`
	`23`	`+print(nextPermutation([1, 2, 4, 5, 6, 0]))`
	`24`	`+`
	`25`	`+# T.C = O(n)`
	`26`	`+# S.C = O(1)`

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