【问题描述】
现有n堆球，其中n是偶数，第i堆中有 ai 个球。现需要将其中 n / 2 堆中的球数全变成完
全平方数，另外的 n / 2 全不为完全平方数。你每一次操作可以选择任意一堆增加或拿走（前
提不为 0）一个球。试问最少需要多少次操作可以满足要求。
【输入】
第一行输入n (2 ≤n ≤ 200 000)为球的 堆数。
第二行输入𝑛个的非负整数 a1,?a2,?...,?an (0≤?ai ≤?109) 每堆的球数。
【输出】
输出最少的操作步数。
【输入样例】
4
12 14 30 4
【输出样例】
2
【输入样例】
6
0 0 0 0 0 0
【输出样例】
6
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http://shijue.me/community/photo-details/3576e5a5dd354384a68075115bac1f69_d
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