同意Cedrus.

package main

import (
    "fmt"
    "sort"
)

func main() {
    a := []int{2, 1, 3}

    m := make(map[int]int, len(a))
    for i, v := range a {
        m[v] = i
    }

    sort.Ints(a)
    for _, v := range a {
        fmt.Printf("%d's old index is %d\n", v, m[v])
    }
}

程序不是這么設(shè)計(jì)的。既然想關(guān)了兩個(gè)字段，為何不用map

type food struct{
    typ int
    price int
}
foods := make(map[int]food,0)