2. 程式人生 > >303. Range Sum Query - Immutable 數組範圍求和 - 不變

303. Range Sum Query - Immutable 數組範圍求和 - 不變

阿新 • • 發佈：2017-08-01
family elements ger mon integer ack man gin 不變

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:

  1. You may assume that the array does not change.
  2. There are many calls to sumRange function.

  1. class NumArray(object):
  3.     summations = []
  5.     def __init__(self, nums):
  6.         """
  7.         :type nums: List[int]
  8.         """
  9.         self.summations = []
  10.         curSum = 0
  11.         for i in nums:
  12.             curSum = curSum + i
  13.             self.summations.append(curSum)
  14.         
  16.     def sumRange(self, i, j):
  17.         
     
    """
  18.         :type i: int
  19.         :type j: int
  20.         :rtype: int
  21.         """
  22.         if i is 0:
  23.             return self.summations[j]
  24.         else:
  25.             return self.summations[j] - self.summations[i-1]



來自為知筆記(Wiz)

303. Range Sum Query - Immutable 數組範圍求和 - 不變

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