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Merge pull request #2882 from buptz2b/master

Update 0001.两数之和.md

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Original file line number	Diff line number	Diff line change
`@@ -285,17 +285,16 @@ func twoSum(nums []int, target int) []int {`
`285`	`285`	```
`286`	`286`
`287`	`287`	```go
`288`		`-// 使用map方式解题,降低时间复杂度`
`289`	`288`	`func twoSum(nums []int, target int) []int {`
`290`	`289`	`m := make(map[int]int)`
`291`		`- for index, val := range nums {`
`292`		`- if preIndex, ok := m[target-val]; ok {`
`293`		`- return []int{preIndex, index}`
`294`		`- } else {`
`295`		`- m[val] = index`
	`290`	`+ for i, num := range nums {`
	`291`	`+ complement := target - num`
	`292`	`+ if index, found := m[complement]; found {`
	`293`	`+ return []int{index, i}`
`296`	`294`	`}`
	`295`	`+ m[num] = i`
`297`	`296`	`}`
`298`		`- return []int{}`
	`297`	`+ return nil// 返回空数组 nil 代替空切片`
`299`	`298`	`}`
`300`	`299`	```
`301`	`300`

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