/// <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 sources = new string[dataGridView1.Rows.Count];
var destinations = new string[dataGridView1.Rows.Count];
var prices = new double[dataGridView1.Rows.Count];
for (var index = 0; index < dataGridView1.Rows.Count; index++)
{
sources[index] = Convert.ToString(dataGridView1[0, index].EditedFormattedValue);
destinations[index] = Convert.ToString(dataGridView1[1, index].EditedFormattedValue);
prices[index] = Convert.ToDouble(dataGridView1[2, index].EditedFormattedValue);
}
var stack = new Stack <BranchesAndBoundsPlan>();
var zero = new BranchesAndBoundsPlan();
zero.MinPrice = 0;
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 = double.MaxValue;
var foundPlan = zero;
while (stack.Any())
{
var item = stack.Pop();
do
{
if (item.bools.Count == dataGridView1.Rows.Count)
{
var s = new List <string>();
var d = new List <string>();
for (var j = 0; j < dataGridView1.Rows.Count; j++)
{
if (item.bools.ContainsKey(j) && item.bools[j])
{
continue;
}
s.Add(sources[j]);
d.Add(destinations[j]);
}
if (item.MaxPrice < foundPrice && IsAcyclic(s, d))
{
foundPrice = item.MaxPrice;
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.MaxPrice = item.MaxPrice;
b.MinPrice += prices[index];
if (b.MinPrice <= foundPrice)
{
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.MaxPrice -= prices[index];
}
} while (item != null);
}
for (var index = 0; index < dataGridView1.Rows.Count; index++)
{
dataGridView1[3, 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 sources = new string[dataGridView1.Rows.Count];
var destinations = new string[dataGridView1.Rows.Count];
var prices = new double[dataGridView1.Rows.Count];
var foundPrice = double.MaxValue;
for (var index = 0; index < dataGridView1.Rows.Count; index++)
{
sources[index] = Convert.ToString(dataGridView1[0, index].EditedFormattedValue);
destinations[index] = Convert.ToString(dataGridView1[1, index].EditedFormattedValue);
prices[index] = Convert.ToDouble(dataGridView1[2, index].EditedFormattedValue);
}
var list = new List <BranchesAndBoundsPlan>();
var list2 = new List <BranchesAndBoundsPlan>();
var zero = new BranchesAndBoundsPlan
{
MinPrice = 0,
MaxPrice = prices.Sum()
};
list.Add(zero);
for (var index = 0; index <= dataGridView1.Rows.Count; index++)
{
var list1 = new List <BranchesAndBoundsPlan>();
foreach (var item in list)
{
var s = new List <string>();
var d = new List <string>();
for (var j = 0; j < dataGridView1.Rows.Count; j++)
{
if (item.bools.ContainsKey(j) && item.bools[j])
{
continue;
}
s.Add(sources[j]);
d.Add(destinations[j]);
}
if (IsAcyclic(s, d))
{
var price = item.bools.Where(pair => pair.Value).Sum(pair => prices[pair.Key]);
foundPrice = Math.Min(foundPrice, price);
list2.Add(item);
}
else if (index < dataGridView1.Rows.Count)
{
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);
a.MaxPrice = item.MaxPrice - prices[index];
a.MinPrice = item.MinPrice;
b.bools.Add(index, true);
b.MaxPrice = item.MaxPrice;
b.MinPrice = item.MinPrice + prices[index];
list1.Add(a);
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) + list2.Sum(i => 1 + i.bools.Count));
}
}
list = list1.Where(i => i.MinPrice <= foundPrice + 0.0001).ToList();
textBox1.Text += string.Format("Memory: {0} items" + Environment.NewLine, list.Sum(i => 1 + i.bools.Count) + list2.Sum(i => 1 + i.bools.Count));
}
if (!list2.Any())
{
return;
}
textBox1.Text += string.Format("Memory: {0} items" + Environment.NewLine, list2.Sum(i => 1 + i.bools.Count));
var z = list2.First(i => Math.Abs(i.MinPrice - foundPrice) < 0.0001);
for (var index = 0; index < dataGridView1.Rows.Count; index++)
{
dataGridView1[3, index].Value = z.bools.ContainsKey(index) && z.bools[index];
}
UpdateTotal();
SystemSounds.Beep.Play();
}