public void StressTest()
{
for (var ph = 0; ph < 10000; ph++)
{
var n = Utilities.RandomInteger(1, 20);
var m = Utilities.RandomInteger(1, 100);
var expected = new bool[n].Select(_ => Utilities.RandomBool()).ToArray();
var ts = new TwoSatisfiability(n);
var xs = new int[m];
var ys = new int[m];
var types = new int[m];
for (var i = 0; i < m; i++)
{
var x = Utilities.RandomInteger(0, n - 1);
var y = Utilities.RandomInteger(0, n - 1);
var type = Utilities.RandomInteger(0, 2);
xs[i] = x;
ys[i] = y;
types[i] = type;
switch (type)
{
case 0:
ts.AddClause(x, expected[x], y, expected[y]);
break;
case 1:
ts.AddClause(x, !expected[x], y, expected[y]);
break;
default:
ts.AddClause(x, expected[x], y, !expected[y]);
break;
}
}
Assert.That(ts.IsSatisfiable, Is.True);
var actual = ts.Answer;
for (var i = 0; i < m; i++)
{
var(x, y, type) = (xs[i], ys[i], types[i]);
switch (type)
{
case 0:
Assert.That(actual[x] == expected[x] || actual[y] == expected[y], Is.True);
break;
case 1:
Assert.That(actual[x] != expected[x] || actual[y] == expected[y], Is.True);
break;
default:
Assert.That(actual[x] == expected[x] || actual[y] != expected[y], Is.True);
break;
}
}
}
}
public static void Solve()
{
var ND = Console.ReadLine().Split(" ").Select(int.Parse).ToArray();
var(N, D) = (ND[0], ND[1]);
var X = new int[N];
var Y = new int[N];
for (var i = 0; i < N; i++)
{
var XY = Console.ReadLine().Split(" ").Select(int.Parse).ToArray();
(X[i], Y[i]) = (XY[0], XY[1]);
}
var ts = new TwoSatisfiability(N);
for (var i = 0; i < N; i++)
{
for (var j = i + 1; j < N; j++)
{
if (Math.Abs(X[i] - X[j]) < D)
{
ts.AddClause(i, false, j, false);
}
if (Math.Abs(X[i] - Y[j]) < D)
{
ts.AddClause(i, false, j, true);
}
if (Math.Abs(Y[i] - X[j]) < D)
{
ts.AddClause(i, true, j, false);
}
if (Math.Abs(Y[i] - Y[j]) < D)
{
ts.AddClause(i, true, j, true);
}
}
}
if (!ts.IsSatisfiable())
{
Console.WriteLine("No");
return;
}
Console.WriteLine("Yes");
var answer = ts.Answer;
for (var i = 0; i < N; i++)
{
Console.WriteLine(answer[i] ? X[i] : Y[i]);
}
}
public void OneTest()
{
var ts = new TwoSatisfiability(1);
ts.AddClause(0, true, 0, true);
ts.AddClause(0, false, 0, false);
Assert.That(ts.IsSatisfiable(), Is.False);
ts = new TwoSatisfiability(1);
ts.AddClause(0, true, 0, true);
Assert.That(ts.IsSatisfiable(), Is.True);
Assert.That(new[] { true }, Is.EqualTo(ts.Answer));
ts = new TwoSatisfiability(1);
ts.AddClause(0, false, 0, false);
Assert.That(ts.IsSatisfiable(), Is.True);
Assert.That(new[] { false }, Is.EqualTo(ts.Answer));
}
public void InvalidArgumentsTest(int i, int j)
{
var ts = new TwoSatisfiability(2);
Assert.Throws <ArgumentOutOfRangeException>(() => ts.AddClause(i, true, j, true));
}