#!/usr/bin/env python
# coding=utf-8
#
# Author: Lucas
# Date: 2019-05-02 21:03:08
class NumArray:
def __init__(self, nums: List[int]):
self.nums = nums
self.sum = [0]
for n in nums:
self.sum.append(self.sum[-1] + n)
def sumRange(self, i: int, j: int) -> int:
return self.sum[j+1] - self.sum[i]
# Your NumArray object will be instantiated and called as such:
# obj = NumArray(nums)
# param_1 = obj.sumRange(i,j)