我正在使用遞歸解決 leetcode 中的問題。但是，用作參數的值在方法中發生了變化。package mainimport "fmt"func makeCmbs(cmbs [][]int, nums []int, remains []int, k int) [][]int {    fmt.Println("==", cmbs, nums, remains, k) // (2)    if k == 0 {        cmbs = append(cmbs, nums)        fmt.Println("!", nums, cmbs)        return cmbs    }    for i, num := range remains {        fmt.Printf("-[%d] num:%d cmbs:%v remains:%v\n", i, num, cmbs, remains) // (1) cmbs here is [[1,2,3,4]]        cmbs = makeCmbs(cmbs, append(nums, num), remains[i+1:], k-1) // cmbs in makeCmbs method is [[1,2,3,5]] ???        fmt.Printf("+[%d] num:%d cmbs:%v\n", i, num, cmbs)    }    return cmbs}func combine(n int, k int) [][]int {    remains := make([]int, n)    for i := 0; i < n; i++ {        remains[i] = i + 1    }    return makeCmbs([][]int{}, []int{}, remains, k)}func main() {    combine(5, 4)}Bellow是它輸出的開始。== [] [] [1 2 3 4 5] 4-[0] num:1 cmbs:[] remains:[1 2 3 4 5]== [] [1] [2 3 4 5] 3-[0] num:2 cmbs:[] remains:[2 3 4 5]== [] [1 2] [3 4 5] 2-[0] num:3 cmbs:[] remains:[3 4 5]== [] [1 2 3] [4 5] 1-[0] num:4 cmbs:[] remains:[4 5]== [] [1 2 3 4] [5] 0! [1 2 3 4] [[1 2 3 4]]+[0] num:4 cmbs:[[1 2 3 4]]-[1] num:5 cmbs:[[1 2 3 4]] remains:[4 5] <---- cmbs is [[1 2 3 4]]== [[1 2 3 5]] [1 2 3 5] [] 0             <---- why [[1 2 3 5]] ???正如你所看到的最后兩行，cmbs [[1 2 3 4]] 變成了 [[1 2 3 5]]。誰能給我一個線索，為什么在 makeCmbs 方法中改變 cmbs 值？