Codeforces Round #290 (Div. 2) A. Fox And Snake

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Codeforces Round #310 (Div. 2) A. Case of the Zeros and Ones

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Codeforces Round #258 (Div. 2) A. Game With Sticks

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Codeforces Round #173 (Div. 2) A. Bit++

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Codeforces Round #277 (Div. 2) A. Calculating Function

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Codeforces Round #163 (Div. 2) A. Stones on the Table

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Codeforces Round #295 (Div. 2) A. Pangram

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Codeforces Beta Round #40 (Div. 2) A. Translation

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Codeforces Round #304 (Div. 2) A. Soldier and Bananas

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Codeforces Round #267 (Div. 2) A. George and Accommodation

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