给定一个整数数组 nums,求出数组从索引 i 到 j (i ≤ j) 范围内元素的总和,包含 i, j 两点。
示例:
给定 nums = [-2, 0, 3, -5, 2, -1],求和函数为sumRange() sumRange(0, 2) -> 1 sumRange(2, 5) -> -1 sumRange(0, 5) -> -3python
class NumArray(object):
def __init__(self, nums):
"""
:type nums: List[int]
"""
self.nums=nums
def sumRange(self, i, j):
"""
:type i: int
:type j: int
:rtype: int
"""
return sum(self.nums[i:j+1])
# Your NumArray object will be instantiated and called as such:
# obj = NumArray(nums)
# param_1 = obj.sumRange(i,j)
