题目
acm 一道水题：Increase and Decrease 求思路
Description
Polycarpus has an array, consisting of n integers a1, a2, ..., an. Polycarpus likes it when numbers in an array match. That's why he wants the array to have as many equal numbers as possible. For that Polycarpus performs the following operation multiple times:
he chooses two elements of the array ai, aj (i ≠ j); he simultaneously increases number ai by 1 and decreases number aj by 1, that is, executes ai = ai + 1 and aj = aj - 1.
The given operation changes exactly two
Description
Polycarpus has an array, consisting of n integers a1, a2, ..., an. Polycarpus likes it when numbers in an array match. That's why he wants the array to have as many equal numbers as possible. For that Polycarpus performs the following operation multiple times:
he chooses two elements of the array ai, aj (i ≠ j); he simultaneously increases number ai by 1 and decreases number aj by 1, that is, executes ai = ai + 1 and aj = aj - 1.
The given operation changes exactly two
提问时间：2021-04-05
答案
先用HASH记录每个数字的出现个数,然后找出出现最多的那个数字ai,数目为MAX1,算出剩下的数字个数N,若是奇数,则ANS=MAX1+N-1,若是偶数,则判断平均数与那个数字ai的大小,若相等则ANS=MAX1+N,否则ANS=MAX1+N-1
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