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学号：2023111432
修改思路：
1.修正了数组大小错误
数组大小应该是26，而不是25
2.修复了循环逻辑错误导致的跨界访问
原本的循环会尝试获取s[lenth]处的字符
3. 修复计数数组初始化逻辑错误
原代码使用 num[s.charAt(i) - 'a']-- 错误记录负次数
修正为 num[s.charAt(i) - 'a']++ 正确记录正次数
在判断是否跳过重复字符前先减少剩余次数
确保弹出条件判断准确
测试结果：
12个测试用例全部通过
包括题目示例和多种边界情况
代码逻辑正确，性能符合要求