/// <summary>
/// Метод поска с возвратом
/// При поиске не добавляются в стек плохие направления
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void branchesAndBoundsAndReturn_Click(object sender, EventArgs e)
{
var capacity = (double)numericUpDownCapacity.Value;
var weights = new double[dataGridView1.Rows.Count];
var prices = new double[dataGridView1.Rows.Count];
for (var index = 0; index < dataGridView1.Rows.Count; index++)
{
weights[index] = Convert.ToDouble(dataGridView1[0, index].EditedFormattedValue);
prices[index] = Convert.ToDouble(dataGridView1[1, index].EditedFormattedValue);
}
var stack = new Stack <BranchesAndBoundsPlan>();
var zero = new BranchesAndBoundsPlan();
zero.MinWeight = 0;
zero.MinPrice = 0;
zero.MaxWeight = weights.Sum();
zero.MaxPrice = prices.Sum();
stack.Push(zero);
textBox1.Text += string.Format("Memory: {0} items" + Environment.NewLine, stack.Sum(i => 1 + i.bools.Count));
var foundPrice = 0.0;
var foundPlan = zero;
while (stack.Any())
{
var item = stack.Pop();
do
{
if (item.bools.Count == dataGridView1.Rows.Count)
{
if (item.MinPrice >= foundPrice && item.MaxWeight <= capacity)
{
foundPrice = item.MinPrice;
foundPlan = item;
}
item = null;
}
else
{
var b = new BranchesAndBoundsPlan();
foreach (var pair in item.bools)
{
b.bools.Add(pair.Key, pair.Value);
}
var index = b.bools.Count;
b.bools.Add(index, true);
b.MaxWeight = item.MaxWeight;
b.MaxPrice = item.MaxPrice;
b.MinWeight = item.MinWeight + weights[index];
b.MinPrice = item.MinPrice + prices[index];
if (b.MaxPrice >= foundPrice && b.MinWeight <= capacity)
{
stack.Push(b); // отсечение границей
textBox1.Text += string.Format("Memory: {0} items" + Environment.NewLine, stack.Sum(i => 1 + i.bools.Count));
}
index = item.bools.Count;
item.bools.Add(index, false);
item.MaxWeight = item.MaxWeight - weights[index];
item.MaxPrice -= prices[index];
}
} while (item != null);
}
for (var index = 0; index < dataGridView1.Rows.Count; index++)
{
dataGridView1[2, index].Value = foundPlan.bools[index];
}
UpdateTotal();
SystemSounds.Beep.Play();
}
/// <summary>
/// Метод ветвей и границ
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void branchesAndBounds_Click(object sender, EventArgs e)
{
var capacity = (double)numericUpDownCapacity.Value;
var weights = new double[dataGridView1.Rows.Count];
var prices = new double[dataGridView1.Rows.Count];
var foundPrice = 0.0;
for (var index = 0; index < dataGridView1.Rows.Count; index++)
{
weights[index] = Convert.ToDouble(dataGridView1[0, index].EditedFormattedValue);
prices[index] = Convert.ToDouble(dataGridView1[1, index].EditedFormattedValue);
}
var list = new List <BranchesAndBoundsPlan>();
var zero = new BranchesAndBoundsPlan();
zero.MinWeight = 0;
zero.MinPrice = 0;
zero.MaxWeight = weights.Sum();
zero.MaxPrice = prices.Sum();
list.Add(zero);
for (var index = 0; index < dataGridView1.Rows.Count; index++)
{
foundPrice = list.Select(i => i.MinPrice).Max();
var list1 = new List <BranchesAndBoundsPlan>();
foreach (var item in list)
{
var a = new BranchesAndBoundsPlan();
var b = new BranchesAndBoundsPlan();
foreach (var pair in item.bools)
{
a.bools.Add(pair.Key, pair.Value);
b.bools.Add(pair.Key, pair.Value);
}
a.bools.Add(index, false);
b.bools.Add(index, true);
a.MaxWeight = item.MaxWeight - weights[index];
a.MaxPrice = item.MaxPrice - prices[index];
a.MinWeight = item.MinWeight;
a.MinPrice = item.MinPrice;
b.MaxWeight = item.MaxWeight;
b.MaxPrice = item.MaxPrice;
b.MinWeight = item.MinWeight + weights[index];
b.MinPrice = item.MinPrice + prices[index];
if (a.MaxPrice >= foundPrice)
{
list1.Add(a);
}
if (b.MinWeight <= capacity)
{
list1.Add(b);
}
textBox1.Text += string.Format("Memory: {0} items" + Environment.NewLine, list.Sum(i => 1 + i.bools.Count) + list1.Sum(i => 1 + i.bools.Count));
}
foundPrice = list1.Select(i => i.MinPrice).Max();
list = list1.Where(i => i.MaxPrice >= foundPrice).ToList();
textBox1.Text += string.Format("Memory: {0} items" + Environment.NewLine, list.Sum(i => 1 + i.bools.Count));
}
if (!list.Any())
{
return;
}
foundPrice = list.Select(i => i.MinPrice).Max();
var z = list.First(i => i.MinPrice == foundPrice);
for (var index = 0; index < dataGridView1.Rows.Count; index++)
{
dataGridView1[2, index].Value = z.bools[index];
}
UpdateTotal();
SystemSounds.Beep.Play();
}
