Package g2601_2700.s2681_power_of_heroes

Class Solution

java.lang.Object

g2601_2700.s2681_power_of_heroes.Solution

public class Solution
extends Object

2681 - Power of Heroes.<p>Hard</p> <p>You are given a <strong>0-indexed</strong> integer array <code>nums</code> representing the strength of some heroes. The <strong>power</strong> of a group of heroes is defined as follows:</p> <ul> <li>Let <code>i₀</code>, <code>i₁</code>, &hellip; ,<code>i_k</code> be the indices of the heroes in a group. Then, the power of this group is <code>max(nums[i₀], nums[i₁], &hellip; ,nums[i_k])² * min(nums[i₀], nums[i₁], &hellip; ,nums[i_k])</code>.</li> </ul> <p>Return <em>the sum of the <strong>power</strong> of all <strong>non-empty</strong> groups of heroes possible.</em> Since the sum could be very large, return it <strong>modulo</strong> <code>10⁹ + 7</code>.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> nums = [2,1,4]</p> <p><strong>Output:</strong> 141</p> <p><strong>Explanation:</strong></p> <p>1^st group: [2] has power = 2² * 2 = 8.</p> <p>2^nd group: [1] has power = 1² * 1 = 1.</p> <p>3^rd group: [4] has power = 4² * 4 = 64.</p> <p>4^th group: [2,1] has power = 2² * 1 = 4.</p> <p>5^th group: [2,4] has power = 4² * 2 = 32.</p> <p>6^th group: [1,4] has power = 4² * 1 = 16.</p> <p>7^th group: [2,1,4] has power = 4² * 1 = 16.</p> <p>The sum of powers of all groups is 8 + 1 + 64 + 4 + 32 + 16 + 16 = 141.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> nums = [1,1,1]</p> <p><strong>Output:</strong> 7</p> <p><strong>Explanation:</strong> A total of 7 groups are possible, and the power of each group will be 1. Therefore, the sum of the powers of all groups is 7.</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= nums.length <= 10⁵</code></li> <li><code>1 <= nums[i] <= 10⁹</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	sumOfPower(int[] nums)

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

sumOfPower

public int sumOfPower(int[] nums)