[HackerEarth] Ghazu uses a social networking site almost all the time. He was wondering what are Friends of Friends in that social networking site? If “X” is his friend, and “Y” is X’s friend but “Y” - 题解

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题目信息
题号 P16851
标题 [HackerEarth] Ghazu uses a social networking site almost all the time. He was wondering what are Friends of Friends in that social networking site? If “X” is his friend, and “Y” is X’s friend but “Y”
难度 普及
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