[HackerEarth] Hitman have an array x1,x2...xN of n elements. You have to tell how many pairs (a,b) - 题解

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题目信息
题号 P18213
标题 [HackerEarth] Hitman have an array x1,x2...xN of n elements. You have to tell how many pairs (a,b)
难度 普及
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