P

```
using System;
namespace Algorithms.Knapsack;
/// <summary>
/// Solves knapsack problem using some heuristics
/// Sum of values of taken items -> max
/// Sum of weights of taken items. <= capacity.
/// </summary>
/// <typeparam name="T">Type of items in knapsack.</typeparam>
public interface IHeuristicKnapsackSolver<T>
{
/// <summary>
/// Solves knapsack problem using some heuristics
/// Sum of values of taken items -> max
/// Sum of weights of taken items. <= capacity.
/// </summary>
/// <param name="items">All items to choose from.</param>
/// <param name="capacity">How much weight we can take.</param>
/// <param name="weightSelector">Maps item to its weight.</param>
/// <param name="valueSelector">Maps item to its value.</param>
/// <returns>Items that were chosen.</returns>
T[] Solve(T[] items, double capacity, Func<T, double> weightSelector, Func<T, double> valueSelector);
}
```