[Fork] Вариация задачи о сдаче | C# Online Compiler

[Fork] Вариация задачи о сдаче by vadim.it

using System;
using System.Linq;
using System.Collections;
using System.Diagnostics;

var rnd = new Random();

var numbers = Enumerable.Range(0, 50).Select(_ => rnd.Next(2,100000000)).ToArray();
Array.Sort(numbers);
Console.WriteLine($"[{string.Join(", ",numbers)}]");

var sw = new Stopwatch();
sw.Start();
var filtered = numbers.Where((x, i)  => !IsSumOf(x, numbers[0..i])).ToList();
sw.Stop();

Console.WriteLine($"Filtered [{string.Join(", ",filtered)}]");
Console.WriteLine($"Performed in {sw.ElapsedMilliseconds} ms");

bool IsSumOf(int x, Span<int> numbers)
{
	if (numbers.Length == 0) return false;
	var h = numbers[^1];
	if (h > x) return IsSumOf(x, numbers[..^1]);
	var mod = x % h;
	if (mod == 0) return true;	
	for (var i = x / h; i>= 0; i--)
	{
		if (IsSumOf(x - i * h, numbers[..^1])) return true;	
	}
	return false;
}

​x
 
using System;
using System.Linq;
using System.Collections;
using System.Diagnostics;
​
var rnd = new Random();
​
var numbers = Enumerable.Range(0, 50).Select(_ => rnd.Next(2,100000000)).ToArray();
Array.Sort(numbers);
Console.WriteLine($"[{string.Join(", ",numbers)}]");
​
var sw = new Stopwatch();
sw.Start();
var filtered = numbers.Where((x, i)  => !IsSumOf(x, numbers[0..i])).ToList();
sw.Stop();
​
Console.WriteLine($"Filtered [{string.Join(", ",filtered)}]");
Console.WriteLine($"Performed in {sw.ElapsedMilliseconds} ms");
​
bool IsSumOf(int x, Span<int> numbers)
{
    if (numbers.Length == 0) return false;
    var h = numbers[^1];
    if (h > x) return IsSumOf(x, numbers[..^1]);
    var mod = x % h;
    if (mod == 0) return true;  
    for (var i = x / h; i>= 0; i--)
    {
        if (IsSumOf(x - i * h, numbers[..^1])) return true; 
    }
    return false;
}

(TARIFFE DEDICATE – si veda htl directory) code DSV•CAREER BAND 1-2: fino a 1.000$ a notte, tasse escluse•CAREER BAND 3-4: fino a 700$ a notte, tasse escluse•CAREER BAND 5-11: fino a 400$ a notte, tasse escluse•CAREER BAND 00: nessuna restrizione, il booker avrà già effettuato il processo autorizzativo interno. 
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(TARIFFE DEDICATE – si veda htl directory) code DSV•CAREER BAND 1-2: fino a 1.000$ a notte, tasse escluse•CAREER BAND 3-4: fino a 700$ a notte, tasse escluse•CAREER BAND 5-11: fino a 400$ a notte, tasse escluse•CAREER BAND 00: nessuna restrizione, il booker avrà già effettuato il processo autorizzativo interno. 
 - 415
(TARIFFE DEDICATE – si veda htl directory) code DSV•CAREER BAND 1-2: fino a 1.000$ a notte, tasse escluse•CAREER BAND 3-4: fino a 700$ a notte, tasse escluse•CAREER BAND 5-11: fino a 400$ a notte, tasse escluse•CAREER BAND 00: nessuna restrizione, il booker avrà già effettuato il processo autorizzativo interno. 
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Last Run:	1:00:03 am
Compile:	0.034s
Execute:	0.05s
Memory:	583.69kb
CPU:	0.084s

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