package mainimport "fmt"func main() {  //s := [][]int{{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}}  //s := [][]int{{1}, {2}, {3}, {4}}  //s := [][]int{{1, 2, 3, 4}, {5, 6, 7, 8}}  s := [][]int{{1, 2}, {5, 6}, {9, 10}, {13, 14}}  printMatrix(s)}func printMatrix(s [][]int) {  if s == nil {    fmt.Println("切片為空，無法打印")  }  bex, bey := 0, 0  hang := len(s) - 1  lie := len(s[0]) - 1  if hang == 0 {    for _, v := range s[0] {      fmt.Println(v)    }    return  }  if lie == 0 {    for _, v := range s {      fmt.Println(v[0])    }    return  }  for bex <= hang && bey <= lie {    ax, ay := bex, bey    for ay < lie {      fmt.Println(s[ax][ay])      ay++    }    for ax < hang {      fmt.Println(s[ax][ay])      ax++    }    for ay > bey {      fmt.Println(s[ax][ay])      ay--    }    for ax > bex {      fmt.Println(s[ax][ay])      ax--    }    bex++    bey++    hang--    lie--  }}