Golang算法问题的内容分析

package huawei
import (
"fmt"
"sort"
)
func Test09Base() {
nums := [][]int{{1, 2, 3}, {2, 3, 4}, {2, 3, 1}, {1, 3, 1}}
firstIndex := 2 //按第二列排序
result := arraySort(nums, firstIndex-1)
fmt.Println(result)
}
//按指定规则对nums进行排序(注：此firstIndex从0开始)
func arraySort(nums [][]int, firstIndex int) [][]int {
//检查
if len(nums) <= 1 {
return nums
}
if firstIndex < 0 || firstIndex > len(nums[0])-1 {
fmt.Println("Warning: Param firstIndex should between 0 and len(nums)-1. The original array is returned.")
return nums
}
//排序
mIntArray := &IntArray{nums, firstIndex}
sort.Sort(mIntArray)
return mIntArray.mArr
}
type IntArray struct {
mArr [][]int
firstIndex int
}
//IntArray实现sort.Interface接口
func (arr *IntArray) Len() int {
return len(arr.mArr)
}
func (arr *IntArray) Swap(i, j int) {
arr.mArr[i], arr.mArr[j] = arr.mArr[j], arr.mArr[i]
}
func (arr *IntArray) Less(i, j int) bool {
arr1 := arr.mArr[i]
arr2 := arr.mArr[j]
for index := arr.firstIndex; index < len(arr1); index++ {
if arr1[index] < arr2[index] {
return true
} else if arr1[index] > arr2[index] {
return false
}
}
return i < j
}