go语言实现寻找最大子数组
题目：给定一个数字序列，寻找其中各元素相加和最大的子数组
1 /* 2 寻找最大子数组go语言实现 3 */ 4 5 package main 6 7 import fmt "fmt" 8 9 func main() { 10 /* 11 需要查找的数组 12 */ 13 A:=[]int{-1,5,-3,-1,3,1,3} 14 low:=0 15 high:=len(A)-1 16 sum:=0 17 low,high,sum=find_max_array(A,0,len(A)-1) 18 /* 19 返回数组边界 20 */ 21 fmt.Println(low," ",high," ",sum) 22 } 23 /* 24 返回越过中间点的最大数组 25 */ 26 func Find_max_acrossing(Array []int,low int,mid int,high int)(int,int,int) { 27 /* 28 现设定左最小值，寻找左边最小数组边界 29 */ 30 left_sum:=-1000 31 sum:=0 32 max_left:=mid 33 for i := mid; i>=low; i-- { 34 sum+=Array[i] 35 if sum>left_sum { 36 left_sum=sum 37 max_left=i 38 } 39 } 40 41 /* 42 现设定右最小值，寻找右边最小数组边界 43 */ 44 right_sum:=-1000 45 sum=0 46 max_right:=mid+1 47 for i := mid+1; i <=high; i++ { 48 sum+=Array[i] 49 if sum>right_sum { 50 right_sum=sum 51 max_right=i 52 } 53 } 54 return max_left,max_right,left_sum+right_sum 55 } 56 57 func find_max_array(Array []int,low int,high int)(int,int,int){ 58 max_left:=low 59 max_right:=high 60 sum:=0 61 if low==high { 62 max_left=low 63 max_right=high 64 sum=Array[high] 65 }else{ 66 mid:=0 67 if (high-low+1)%2==0 { 68 mid=(high+low-1)/2 69 }else{ 70 mid=(high+low)/2 71 } 72 73 max_left_low:=low 74 max_left_high:=mid 75 left_sum:=0 76 max_left_low,max_left_high,left_sum=find_max_array(Array,low,mid) 77 78 max_right_low:=mid+1 79 max_right_high:=high 80 right_sum:=0 81 max_right_low,max_right_high,right_sum=find_max_array(Array,mid+1,high) 82 83 max_across_low:=low 84 max_across_high:=high 85 across_sum:=0 86 max_across_low,max_across_high,across_sum=Find_max_acrossing(Array,low,mid,high) 87 88 if left_sum>right_sum && left_sum>across_sum{ 89 max_left=max_left_low 90 max_right=max_left_high 91 sum=left_sum 92 }else if right_sum>left_sum && right_sum>across_sum { 93 max_left=max_right_low 94 max_right=max_right_high 95 sum=right_sum 96 }else if across_sum>left_sum && across_sum>right_sum { 97 max_left=max_across_low 98 max_right=max_across_high 99 sum=across_sum 100 } 101 } 102 return max_left,max_right,sum 103 }
