[old] Even the Last

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给你一个整数数组，需要你把具有偶数索引的元素相加（0，2，4 ...），然后把相加后得到的数与最后一个元素相乘。不要忘记，第一个元素的索引是0。

如果传入的是一个空数组，则应该返回0。

输入: 一个整数列表

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