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- 修复f数组初始化错误 - 修复幂次计算和取模操作 - 完善遍历条件和贡献计算逻辑 - 添加符合要求的测试类
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学号：2023112265
修改题目号：5
修改思路：
f[0] = 0f[0] = 1（正确表示2^0 = 1）i < nums.length-1会漏掉最后一个元素f[pos - i]f[pos - i - 1]/ P% P