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增加 0047.全排列II go版本

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- 0047.全排列II.md

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`‎problems/0047.全排列II.md`

Lines changed: 39 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -258,7 +258,45 @@ var permuteUnique = function (nums) {`
`258`	`258`	`};`
`259`	`259`
`260`	`260`	```
`261`		`-`
	`261`	`+Go：`
	`262`	`+回溯+本层去重+下层去重`
	`263`	+```golang
	`264`	`+funcpermuteUnique(nums []int) [][]int {`
	`265`	`+varsubRes []int`
	`266`	`+varres [][]int`
	`267`	`+ sort.Ints(nums)`
	`268`	`+used:=make([]bool,len(nums))`
	`269`	`+backTring(nums,subRes,&res,used)`
	`270`	`+return res`
	`271`	`+}`
	`272`	`+funcbackTring(nums,subRes []int,res *[][]int,used []bool){`
	`273`	`+iflen(subRes)==len(nums){`
	`274`	`+tmp:=make([]int,len(nums))`
	`275`	`+copy(tmp,subRes)`
	`276`	`+ res=append(res,tmp)`
	`277`	`+return`
	`278`	`+ }`
	`279`	`+// used[i - 1] == true，说明同一树支candidates[i - 1]使用过`
	`280`	`+// used[i - 1] == false，说明同一树层candidates[i - 1]使用过`
	`281`	`+fori:=0;i<len(nums);i++{`
	`282`	`+if i>0&&nums[i]==nums[i-1]&&used[i-1]==false{//当本层元素相同且前一个被使用过，则继续向后找（本层去重）`
	`283`	`+continue`
	`284`	`+ }`
	`285`	`+//到达这里有两种情况：1.该层前后元素不同；2.该层前后元素相同但该层没有使用过`
	`286`	`+//所以只能对该层没有被使用过的抽取`
	`287`	`+if used[i]==false{`
	`288`	`+//首先将该元素置为使用过（即同一树枝使用过），下一层的元素就不能选择重复使用过的元素（下层去重）`
	`289`	`+ used[i]=true`
	`290`	`+ subRes=append(subRes,nums[i])`
	`291`	`+backTring(nums,subRes,res,used)`
	`292`	`+//回溯`
	`293`	`+//回溯回来，将该元素置为false，表示该元素在该层使用过`
	`294`	`+ used[i]=false`
	`295`	`+ subRes=subRes[:len(subRes)-1]`
	`296`	`+ }`
	`297`	`+ }`
	`298`	`+}`
	`299`	+```
`262`	`300`
`263`	`301`
`264`	`302`

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