func Add(s []int, index int, value int) []int {
len := len(s)
if 0 > index || len <= index {
panic("error")
}
s = append(s, s[len - 1])
temp := len - index
for temp > 0 {
if len - 2 >= 0 {
s[len - 1] = s[len - 2]
}
temp--
len--
}
s[index] = value
return s
}
func Del(s []int, index int) []int {
len := len(s)
if 0 > index || index > len {
panic("error")
}
temp := len - index - 1
for temp > 0 {
s[index] = s[index + 1]
index++
temp--
}
s1 := s[0:len - 1]
return s1
}