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 #274 (Div. 2) A. Expression

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Codeforces Round #465 (Div. 2) A. Fafa and his Company

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Codeforces Round #143 (Div. 2) A. Team

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Codeforces Round #166 (Div. 2) A. Beautiful Year

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Codeforces Beta Round #4 (Div. 2 Only) A. Watermelon

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Codeforces Round #387 (Div. 2) A. Display Size

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

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