题目：

题解：

class Solution {
public:int index = 0;NestedInteger deserialize(string s) {if (s[index] == '[') {index++;NestedInteger ni;while (s[index] != ']') {ni.add(deserialize(s));if (s[index] == ',') {index++;}}index++;return ni;} else {bool negative = false;if (s[index] == '-') {negative = true;index++;}int num = 0;while (index < s.size() && isdigit(s[index])) {num = num * 10 + s[index] - '0';index++;}if (negative) {num *= -1;}return NestedInteger(num);}}
};