LeetCode 2104: Sum of Subarray Ranges Solution

Master LeetCode problem 2104 (Sum of Subarray Ranges), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2104. Sum of Subarray Ranges

Medium

Array Stack Monotonic Stack

Problem Explanation

Explanation

To solve this problem, we need to calculate the sum of all subarray ranges of the given integer array nums. We can achieve this by iterating through the array and for each element, calculating the contribution of that element to the total sum of ranges. The contribution of an element nums[i] to the sum of ranges is (i+1)*(n-i)*nums[i], where n is the length of the array.

Initialize a variable totalSum to store the total sum of ranges.
Iterate through the array nums and for each element:
- Calculate the contribution of that element to the total sum of ranges using the formula mentioned above.
- Add the contribution to the totalSum.
Return the totalSum.

Time Complexity: O(n), where n is the length of the input array nums. Space Complexity: O(1)

Solution Code

class Solution {
    public int sumSubarrayMins(int[] nums) {
        int MOD = (int)1e9 + 7;
        int n = nums.length;
        int totalSum = 0;

        for (int i = 0; i < n; i++) {
            totalSum = (totalSum + (i + 1) * (n - i) * nums[i]) % MOD;
        }

        return totalSum;
    }
}

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