题目：

题解：

func deserialize(s string) *NestedInteger {
    if s[0] != '[' {
        num, _ := strconv.Atoi(s)
        ni := &NestedInteger{}
        ni.SetInteger(num)
        return ni
    }
    stack, num, negative := []*NestedInteger{}, 0, false
    for i, ch := range s {
        if ch == '-' {
            negative = true
        } else if unicode.IsDigit(ch) {
            num = num*10 + int(ch-'0')
        } else if ch == '[' {
            stack = append(stack, &NestedInteger{})
        } else if ch == ',' || ch == ']' {
            if unicode.IsDigit(rune(s[i-1])) {
                if negative {
                    num = -num
                }
                ni := NestedInteger{}
                ni.SetInteger(num)
                stack[len(stack)-1].Add(ni)
            }
            num, negative = 0, false
            if ch == ']' && len(stack) > 1 {
                stack[len(stack)-2].Add(*stack[len(stack)-1])
                stack = stack[:len(stack)-1]
            }
        }
    }
    return stack[len(stack)-1]
}