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**Replay** 三排，开场通过签到J，I。 yyt发现D为数据结构，写D通过。 whx写K，写完提交WA，改算法后通过。 tzw猜出C乱搞做法，本地对拍通过提交WA。终场未通过。 **Problems** D：线段树统计贡献。 C：双调排序/梳排序等排序网络 H：模拟。 **Dirt** J(-1) 边界取错。 K(-2) kmp不能用来求回文，用manacher或二分哈希。 C(-6) 细节写挂。