第八周 周三作业

题目描述：

代码：

class Solution:
	def pivotIndex(self, nums):
		if len(nums) == 0:
			return -1
		if sum(nums[1:])==0:
			return 0
		total = sum(nums)
		now = nums[0]*2;
		for i in range(1, len(nums)-1):
			if now + nums[i] == total:
				return i
			now+=nums[i]*2
		if sum(nums[0:len(nums)-1])==0:
			return len(nums)-1
		return -1;

测试代码：

from solution import *
nums = [1, 7, 3, 6, 5, 6]
print(Solution().pivotIndex(nums))

运行结果：