Codeforces Round #247 (Div. 2) A. Black Square

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Codeforces Beta Round #47 A. Domino piling

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Codeforces Round #375 (Div. 2) A. The New Year: Meeting Friends

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Codeforces Round #146 (Div. 2) A. Boy or Girl

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Codeforces Beta Round #94 (Div. 2 Only) A. Cookies

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Codeforces Beta Round #91 (Div. 2 Only) A. Lucky Division

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Codeforces Beta Round #89 (Div. 2) A. String Task

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Codeforces Beta Round #85 (Div. 2 Only) A. Petya and Strings

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Codeforces Beta Round #84 (Div. 2 Only) A. Nearly Lucky Number

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Codeforces Round #495 (Div. 2) A. Sonya and Hotels

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