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// @Title: 寻找数组的中心下标 (Find Pivot Index)
// @Author: 15816537946@163.com
// @Date: 2022-03-19 19:15:22
// @Runtime: 16 ms
// @Memory: 6 MB
func pivotIndex(nums []int) int {
    var sum, total int 
    for _,v := range nums {
        total+=v
    }

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

    return -1
}