@@ -389,6 +389,54 @@ class Solution:
389389### Go
390390
391391``` go
392+ func searchRange (nums []int , target int ) []int {
393+ leftBorder := searchLeftBorder (nums, target)
394+ rightBorder := searchRightBorder (nums, target)
395+ 396+ if leftBorder == -2 || rightBorder == -2 { // 情况一
397+ return []int {-1 , -1 }
398+ } else if rightBorder-leftBorder > 1 { // 情况三
399+ return []int {leftBorder + 1 , rightBorder - 1 }
400+ } else { // 情况二
401+ return []int {-1 , -1 }
402+ }
403+ }
404+ 405+ func searchLeftBorder (nums []int , target int ) int {
406+ left , right := 0 , len (nums)-1
407+ leftBorder := -2 // 记录一下leftBorder没有被赋值的情况
408+ for left <= right {
409+ middle := (left + right) / 2
410+ if target == nums[middle] {
411+ right = middle - 1
412+ // 左边界leftBorder更新
413+ leftBorder = right
414+ } else if target > nums[middle] {
415+ left = middle + 1
416+ } else {
417+ right = middle - 1
418+ }
419+ }
420+ return leftBorder
421+ }
422+ 423+ func searchRightBorder (nums []int , target int ) int {
424+ left , right := 0 , len (nums)-1
425+ rightBorder := -2 // 记录一下rightBorder没有被赋值的情况
426+ for left <= right {
427+ middle := (left + right) / 2
428+ if target == nums[middle] {
429+ left = middle + 1
430+ // 右边界rightBorder更新
431+ rightBorder = left
432+ } else if target > nums[middle] {
433+ left = middle + 1
434+ } else {
435+ right = middle - 1
436+ }
437+ }
438+ return rightBorder
439+ }
392440```
393441
394442### JavaScript
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