给定一个数组，判断其中的数据序列是否左右对称：偶数个数时，左右两半部分正好逆序；奇数时，除中间位置数外，左右逆序。(学堂在线课后作业)-Given an array, which determines whether a data sequence symmetrical: an even number when the two halves of just the reverse an odd number, in addition to the number of intermediate