[HackerEarth] Kuku recently learnt about triangular numbers. If you are not familiar with the triangular numbers follow this link first http://en.wikipedia.org/wiki/Triangular_number. Ani thinks Kuku - 题解

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题目信息
题号 P15884
标题 [HackerEarth] Kuku recently learnt about triangular numbers. If you are not familiar with the triangular numbers follow this link first http://en.wikipedia.org/wiki/Triangular_number. Ani thinks Kuku
难度 普及
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