题目：

题解：

class Solution {int index = 0;public NestedInteger deserialize(String s) {if (s.charAt(index) == '[') {index++;NestedInteger ni = new NestedInteger();while (s.charAt(index) != ']') {ni.add(deserialize(s));if (s.charAt(index) == ',') {index++;}}index++;return ni;} else {boolean negative = false;if (s.charAt(index) == '-') {negative = true;index++;}int num = 0;while (index < s.length() && Character.isDigit(s.charAt(index))) {num = num * 10 + s.charAt(index) - '0';index++;}if (negative) {num *= -1;}return new NestedInteger(num);}}
}