Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.
Example:
Given nums = [-2, 0, 3, -5, 2, -1]
sumRange(0, 2) -> 1
sumRange(2, 5) -> -1
sumRange(0, 5) -> -3
Note:
You may assume that the array does not change.
There are many calls to sumRange function.
class NumArray:
def __init__(self, nums: List[int]):
self.dp = list(nums)
self.dp.insert(0, 0)
for i in range(1, len(nums)):
self.dp[i+1] += self.dp[i]
def sumRange(self, i: int, j: int) -> int:
return self.dp[j+1] - self.dp[i]