LC-2574 Easy LeetCode

2574. Left and Right Sum Differences

Read the full problem statement on LeetCode.

Difficulty: easy Acceptance: 87% Topics: Array, Prefix Sum

Reading material

Arrays & Hashing 12 min Prefix Sums & Difference Arrays 11 min

Reference solution (spoiler · python)

# Time:  O(n)
# Space: O(1)

# prefix sum
class Solution(object):
    def leftRightDifference(self, nums):
        """
        :type nums: List[int]
        :rtype: List[int]
        """
        total = sum(nums)
        result = []
        curr = 0
        for x in nums:
            curr += x
            result.append(abs((curr-x)-(total-curr)))
        return result

Solution from kamyu104/LeetCode-Solutions · MIT