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1092 - Lighted Panels PDF (English) Statistics Forum Time Limit: 3 second(s) Memory Limit: 32 MB You are given an R x C 2D grid consisting of several 阅读全文
摘要：
D. Puzzles Barney lives in country USC (United States of Charzeh). USC has n cities numbered from 1 through n and n - 1 roads between them. Cities and 阅读全文