static Star getMajorityGalaxyStarCandidate(List <Star> candidateGalaxy)
{
long loopCount = candidateGalaxy.Count - 1;
List <Star> toReturn = new List <Star>();
Star y = null;
if (candidateGalaxy.Count == 0)
{
return(null);
}
else if (candidateGalaxy.Count == 1)
{
return(candidateGalaxy[0]);
}
//else if(candidateGalaxy.Count == 2)
//{
// //candidateGalaxy.Pop();
// return candidateGalaxy.Pop();
//}
else
{
if (candidateGalaxy.Count % 2 != 0)
{
loopCount--;
//toReturn.Add(candidateGalaxy[0]);
y = candidateGalaxy[candidateGalaxy.Count - 1];
}
for (int i = 0; i <= loopCount; i += 2)
{
Star a = candidateGalaxy[i];
Star b = candidateGalaxy[i + 1];
if (a.inGalaxy(b))
{
//toReturn.Push(a);//TODO: Fix this, as pushing both on can form an infinite loop, but only pushing one can cause a false negative
toReturn.Add(b);
}
}
Star x = getMajorityGalaxyStarCandidate(toReturn);
if (x == null)
{
if (candidateGalaxy.Count % 2 != 0)
{
return(hasMajorityGalaxy(y, candidateGalaxy));
}
else
{
//Console.WriteLine("NO");
return(null);
}
}
else
{
return(hasMajorityGalaxy(x, candidateGalaxy));
}
}
}
static void Main(string[] args)
{
string variables = Console.ReadLine();
string[] tokens = variables.Split(' ');
Star.distance = long.Parse(tokens[0]);
long numStars = long.Parse(tokens[1]);
//Stack<Star> candidateGalaxy = new Stack<Star>();
List <Star> PU = new List <Star>();
//if(numStars % 2 != 0)
//{
// loopCount--;
//}
for (int i = 0; i < numStars; i++)
{
string star = Console.ReadLine();
string[] starCoordinates = star.Split(' ');
PU.Add(new Star(long.Parse(starCoordinates[0]), long.Parse(starCoordinates[1])));
}
//Star CandidateStar = getMajorityGalaxyStarCandidate(PU);
//Console.WriteLine("Candidate Star - x=" + CandidateStar.x + " y=" + CandidateStar.y);
//hasMajorityGalaxy(CandidateStar, PU);
Star result = getMajorityGalaxyStarCandidate(PU);
if (result == null)
{
Console.WriteLine("NO");
}
else
{
HashSet <Star> count = new HashSet <Star>();
foreach (Star s in PU)
{
if (result.inGalaxy(s))
{
count.Add(s);
}
}
if (count.Count > PU.Count / 2)
{
Console.WriteLine(count.Count);
}
else
{
Console.WriteLine("NO");
}
}
Console.Read();
}
static Star hasMajorityGalaxy(Star Candidate, List <Star> PU)
{
List <Star> toReturn = new List <Star>();
//toReturn.Push(Candidate);
foreach (Star s in PU)
{
if (Candidate.inGalaxy(s))
{
toReturn.Add(s);
}
}
if (toReturn.Count > PU.Count / 2)
{
//Console.WriteLine(toReturn.Count);
return(Candidate);
}
else
{
//Console.WriteLine("NO");
return(null);
}
}