Codeforces Beta Round #54 (Div. 2) A. Chat room

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Codeforces Beta Round #1 A. Theatre Square

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Codeforces Beta Round #44 (Div. 2) A. Triangular numbers

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Codeforces Round #289 (Div. 2, ACM ICPC Rules) A. Maximum in Table

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Codeforces Round #131 (Div. 2) A. System of Equations

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Codeforces Round #379 (Div. 2) A. Anton and Danik

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Codeforces Beta Round #27 (Codeforces format, Div. 2) A. Next Test

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Codeforces Beta Round #65 (Div. 2) A. Way Too Long Words

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Codeforces Round #253 (Div. 2) A. Anton and Letters

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Codeforces Round #271 (Div. 2) A. Keyboard

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