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Update 0001.两数之和.md

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Original file line number	Diff line number	Diff line change
`@@ -287,17 +287,16 @@ func twoSum(nums []int, target int) []int {`
`287`	`287`	```
`288`	`288`
`289`	`289`	```go
`290`		`-// 使用map方式解题,降低时间复杂度`
`291`	`290`	`func twoSum(nums []int, target int) []int {`
`292`	`291`	`m := make(map[int]int)`
`293`		`- for index, val := range nums {`
`294`		`- if preIndex, ok := m[target-val]; ok {`
`295`		`- return []int{preIndex, index}`
`296`		`- } else {`
`297`		`- m[val] = index`
	`292`	`+ for i, num := range nums {`
	`293`	`+ complement := target - num`
	`294`	`+ if index, found := m[complement]; found {`
	`295`	`+ return []int{index, i}`
`298`	`296`	`}`
	`297`	`+ m[num] = i`
`299`	`298`	`}`
`300`		`- return []int{}`
	`299`	`+ return nil// 返回空数组 nil 代替空切片`
`301`	`300`	`}`
`302`	`301`	```
`303`	`302`

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