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// @Title: 左右两边子数组的和相等 (左右两边子数组的和相等)
// @Author: 15816537946@163.com
// @Date: 2022-03-19 19:10:46
// @Runtime: 16 ms
// @Memory: 6 MB
func pivotIndex(nums []int) int {
    var total, sum int 
    for _, v := range nums {
        total+=v
    }

    for i, v := range nums {
        if 2 *sum + v  == total {
            return i
        }
        sum += v
    }
    return -1
}