g0301_0400.s0307_range_sum_query_mutable

Class NumArray

java.lang.Object

g0301_0400.s0307_range_sum_query_mutable.NumArray

public class NumArray
extends Object

307 - Range Sum Query - Mutable.

Medium

Given an integer array nums, handle multiple queries of the following types:

1. Update the value of an element in nums.
2. Calculate the sum of the elements of nums between indices left and right inclusive where left <= right.

Implement the NumArray class:

• NumArray(int[] nums) Initializes the object with the integer array nums.
• void update(int index, int val) Updates the value of nums[index] to be val.
• int sumRange(int left, int right) Returns the sum of the elements of nums between indices left and right inclusive (i.e. nums[left] + nums[left + 1] + ... + nums[right]).

Example 1:

Input

["NumArray", "sumRange", "update", "sumRange"]
[[[1, 3, 5]], [0, 2], [1, 2], [0, 2]]

Output: [null, 9, null, 8]

Explanation:

NumArray numArray = new NumArray([1, 3, 5]);
numArray.sumRange(0, 2); // return 1 + 3 + 5 = 9
numArray.update(1, 2); // nums = [1, 2, 5]
numArray.sumRange(0, 2); // return 1 + 2 + 5 = 8 

Constraints:

• 1 <= nums.length <= 3 * 104
• -100 <= nums[i] <= 100
• 0 <= index < nums.length
• -100 <= val <= 100
• 0 <= left <= right < nums.length
• At most 3 * 104 calls will be made to update and sumRange.

Constructor Summary

Constructors

Constructor and Description
NumArray(int[] nums)

Method Summary

Modifier and Type	Method and Description
int	sumRange(int left, int right)
void	update(int index, int val)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NumArray

public NumArray(int[] nums)

Method Detail

update

public void update(int index,
                   int val)

sumRange

public int sumRange(int left,
                    int right)