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1619: [Usaco2008 Nov]Guarding the Farm 保卫牧场 Description The farm has many hills upon which Farmer John would like to place guards to ensure the safety 阅读全文
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= =自觉太颓,模拟赛 #432 Codeforces Round #432 (Div. 2, based on IndiaHacks Final Round 2017) A - Arpa and a research in Mexican wave: 这个就真的太... 有点像火车过隧道,随手一个 阅读全文
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E. Fire time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output E. Fire time limit per test 2 se 阅读全文
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D. Make a Permutation! time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output D. Make a Permuta 阅读全文
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C. Bus time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output A bus moves along the coordinate 阅读全文
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B. Polycarp and Letters time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output B. Polycarp and 阅读全文
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A. Fair Game time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output A. Fair Game time limit per 阅读全文