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===== 赛中记录 =====
12:00-13:00
分头看题，lcj很快关注于N题，并提出了按位考虑放1的做法，在12:41通过了N题
13:00-14:00
hqy和jrt共同讨论K题，提出通过同余从i到i+1的递推方法，但提交一直WA。随后hqy继续调K题，而jrt开始主要思考D题
14:00-15:00
jrt思考D题未果，转而和lcj一同思考A题，hqy在调试K题未果的情况下，转而思考H题，在15:00过了H题
15:00-16:00
jrt和lcj在D题和A题之间反复思考，hqy发现了K题n=1的题的特殊情况，在15:41左右通过了K题
16:00-17:00
D题和A题仍思考未果，jrt和hqy开始思考C题，未果。
===== Dirt记录 =====
K题，最初没有考虑n=1的特殊情况而WA。