Package g0901_1000.s0907_sum_of_subarray_minimums

Class Solution

java.lang.Object

g0901_1000.s0907_sum_of_subarray_minimums.Solution

public class Solution
extends Object

907 - Sum of Subarray Minimums.<p>Medium</p> <p>Given an array of integers arr, find the sum of <code>min(b)</code>, where <code>b</code> ranges over every (contiguous) subarray of <code>arr</code>. Since the answer may be large, return the answer <strong>modulo</strong> <code>10⁹ + 7</code>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> arr = [3,1,2,4]</p> <p><strong>Output:</strong> 17</p> <p><strong>Explanation:</strong></p> <p>Subarrays are [3], [1], [2], [4], [3,1], [1,2], [2,4], [3,1,2], [1,2,4], [3,1,2,4].</p> <p>Minimums are 3, 1, 2, 4, 1, 1, 2, 1, 1, 1. Sum is 17.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> arr = [11,81,94,43,3]</p> <p><strong>Output:</strong> 444</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= arr.length <= 3 * 10⁴</code></li> <li><code>1 <= arr[i] <= 3 * 10⁴</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	sumSubarrayMins(int[] arr)

Methods inherited from class java.lang.Object

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

Constructor Details

Solution

public Solution()

Method Details

sumSubarrayMins

public int sumSubarrayMins(int[] arr)