Caculate sum of a range quickly

See all series problems: #presum

- Leetcode: Subarray Sums Divisible by K
- LeetCode: Subarray Sum Equals K
- LeetCode: Running Sum of 1d Array
- Leetcode: Remove Zero Sum Consecutive Nodes from Linked List
- Leetcode: Range Sum Query – Immutable
- Leetcode: Random Pick with Weight
- LeetCode: Product of the Last K Numbers
- Leetcode: Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
- LeetCode: Minimum Value to Get Positive Step by Step Sum
- Leetcode: Maximum Sum of Two Non-Overlapping Subarrays

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