[HNOI 2017]大佬

[HNOI 2017]大佬

BFSDP各省省选two-pointer
[NOI 2011]NOI 嘉年华

[NOI 2011]NOI 嘉年华

two-pointerDPNOI
CF1446D2 Frequency Problem

CF1446D2 Frequency Problem

结论题根号分治two-pointer

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