[HackerEarth] f(x) is series 1,2,-2,3,-3,3,4,-4,4,-4. Given two positions l and r, find the sum of all elements from l to r(l and r inclusive). - 题解

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题目信息
题号 P19581
标题 [HackerEarth] f(x) is series 1,2,-2,3,-3,3,4,-4,4,-4. Given two positions l and r, find the sum of all elements from l to r(l and r inclusive).
难度 普及
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