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Commitbb65a8d

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committed
add binary search template
1 parentecf250d commitbb65a8d

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2 files changed

+137
-0
lines changed

2 files changed

+137
-0
lines changed

‎lib/Search.go

Lines changed: 61 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,61 @@
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package Solution
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//普通搜索
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funcBinarySearch(nums []int,targetint)int {
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left,right:=0,len(nums)-1
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forleft<right {
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mid:=left+ (right-left)/2
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ifnums[mid]==target {
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returnmid
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}elseifnums[mid]<target {
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left=mid+1
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}elseifnums[mid]>target {
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right=mid-1
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}
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}
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return-1
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}
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//左边界
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funcBinarySearchLeftBound(nums []int,targetint)int {
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left,right:=0,len(nums)-1
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forleft<=right {
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mid:=left+ (right-left)/2
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ifnums[mid]==target {
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right=mid-1
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}elseifnums[mid]<target {
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left=mid+1
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}elseifnums[mid]>target {
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right=mid-1
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}
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}
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ifnums[left]!=target||left>len(nums) {
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return-1
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}
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returnleft
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}
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//右边界
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funcBinarySearchRightBound(nums []int,targetint)int {
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left,right:=0,len(nums)-1
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forleft<=right {
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mid:=left+ (right-left)/2
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ifnums[mid]==target {
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left=mid+1
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}elseifnums[mid]<target {
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left=mid+1
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}elseifnums[mid]>target {
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right=mid-1
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}
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}
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ifright<0||nums[right]!=target {
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return-1
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}
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returnright
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}

‎lib/Search_test.go

Lines changed: 76 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,76 @@
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package Solution
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import (
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"reflect"
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"strconv"
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"testing"
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)
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funcTestBinarySearch(t*testing.T) {
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//测试用例
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cases:= []struct {
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namestring
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inputs []int
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targetint
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expectint
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}{
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{"TestCase", []int{1,2,2,2,3},2,2},
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}
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//开始测试
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fori,c:=rangecases {
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t.Run(c.name+" "+strconv.Itoa(i),func(t*testing.T) {
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got:=BinarySearch(c.inputs,c.target)
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if!reflect.DeepEqual(got,c.expect) {
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t.Fatalf("expected: %v, but got: %v, with inputs: %v",
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c.expect,got,c.inputs)
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}
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})
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}
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}
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funcTestBinarySearchLeftBound(t*testing.T) {
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//测试用例
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cases:= []struct {
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namestring
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inputs []int
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targetint
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expectint
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}{
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{"TestCase", []int{1,2,2,2,3},2,1},
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}
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//开始测试
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fori,c:=rangecases {
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t.Run(c.name+" "+strconv.Itoa(i),func(t*testing.T) {
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got:=BinarySearchLeftBound(c.inputs,c.target)
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if!reflect.DeepEqual(got,c.expect) {
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t.Fatalf("expected: %v, but got: %v, with inputs: %v",
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c.expect,got,c.inputs)
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}
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})
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}
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}
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funcTestBinarySearchRightBound(t*testing.T) {
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//测试用例
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cases:= []struct {
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namestring
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inputs []int
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targetint
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expectint
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}{
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{"TestCase", []int{1,2,2,2,3},2,3},
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}
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//开始测试
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fori,c:=rangecases {
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t.Run(c.name+" "+strconv.Itoa(i),func(t*testing.T) {
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got:=BinarySearchRightBound(c.inputs,c.target)
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if!reflect.DeepEqual(got,c.expect) {
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t.Fatalf("expected: %v, but got: %v, with inputs: %v",
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c.expect,got,c.inputs)
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}
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})
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}
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}

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