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Program.cs
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Program.cs
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using System;
namespace RedundantConnection
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
public int[] FindRedundantConnection(int[][] edges)
{
int[] parent = new int[edges.Length + 1], rank = new int[edges.Length + 1];
for (int i = 0; i < parent.Length; i++)
parent[i] = i;
foreach (var edge in edges)
{
if (!Merge(edge[0], edge[1], parent, rank))
return edge;
}
return null;
}
public int Find(int x, int[] parent)
{
if (parent[x] != x)
parent[x] = Find(parent[x], parent);
return parent[x];
}
public bool Merge(int x, int y, int[] parent, int[] rank)
{
int rootX = Find(x, parent);
int rootY = Find(y, parent);
if (rootX == rootY) return false;
if (rank[rootX] > rank[rootY])
parent[rootY] = rootX;
else if (rank[rootX] < rank[rootY])
parent[rootX] = rootY;
else
{
parent[rootX] = rootY;
rank[rootY]++;
}
return true;
}
}
}