Solution.go

/**
 * // This is the interface that allows for creating nested lists.
 * // You should not implement it, or speculate about its implementation
 * type NestedInteger struct {
 * }
 *
 * // Return true if this NestedInteger holds a single integer, rather than a nested list.
 * func (n NestedInteger) IsInteger() bool {}
 *
 * // Return the single integer that this NestedInteger holds, if it holds a single integer
 * // The result is undefined if this NestedInteger holds a nested list
 * // So before calling this method, you should have a check
 * func (n NestedInteger) GetInteger() int {}
 *
 * // Set this NestedInteger to hold a single integer.
 * func (n *NestedInteger) SetInteger(value int) {}
 *
 * // Set this NestedInteger to hold a nested list and adds a nested integer to it.
 * func (n *NestedInteger) Add(elem NestedInteger) {}
 *
 * // Return the nested list that this NestedInteger holds, if it holds a nested list
 * // The list length is zero if this NestedInteger holds a single integer
 * // You can access NestedInteger's List element directly if you want to modify it
 * func (n NestedInteger) GetList() []*NestedInteger {}
 */
func deserialize(s string) *NestedInteger {
	ans := &NestedInteger{}
	if s == "" || s == "[]" {
		return ans
	}
	if s[0] != '[' {
		v, _ := strconv.Atoi(s)
		ans.SetInteger(v)
		return ans
	}
	depth := 0
	for i, j := 1, 1; i < len(s); i++ {
		if depth == 0 && (s[i] == ',' || i == len(s)-1) {
			(*ans).Add(*deserialize(s[j:i]))
			j = i + 1
		} else if s[i] == '[' {
			depth++
		} else if s[i] == ']' {
			depth--
		}
	}
	return ans
}