题目大意是给出呈环状的m个黑球和n个白球，问能否通过Flip（以一个球为中心交换左右两球）和Shift（跳过）操作使同色球在一起。
Flip操作实际上是使球移到了两个位置，因此如果球的总数是奇数，则球的位置的奇偶性必然是可以变换的，也就意味着必然能够成功。如果球的总数是偶数，则球所在位置的奇偶性不可改变，故同色球在奇数位置和偶数位置上的球的个数差不能大于1，否则无法成功。
3026800 2008-08-07 17:17:49 Accepted 1028 FPC 00:00.00 412K IwfWcf
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