using System using System Collections Generic using System Linq using

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication7
{
class Program
{
static void Main(string[] args)
{
const int edge_count = 5;
int head_count = 4;
int[] edge_start = new int[edge_count] {1,0,3,0,3};
int[] edge_end = new int[edge_count] {2,3,1,1,2};
int[] head_list = new int[head_count];
int[] list_list = new int[edge_count];
int[] rez = new int[edge_start.Length+1];
for (int i = 0; i < edge_start.Length; i++)
{
rez[edge_start[i]+1]++;
}
for (int i = 1; i < rez.Length; i++)
{
rez[i] = rez[i] + rez[i - 1];
}
int[] sorted_edge_start = new int[edge_count];
int[] sorted_edge_end = new int[edge_count];
for (int i = 0; i < edge_start.Length; i++)
{
int offset = rez[edge_start[i]];
rez[edge_start[i]]++;
sorted_edge_start[offset] = edge_start[i];
sorted_edge_end[offset] = edge_end[i];
}
for (int i = 0; i < head_list.Length; i++)
{
head_list[i] = -1;
}
for (int i = 0; i < list_list.Length; i++)
{
list_list[i] = -1;
}
for (int i = 0; i < edge_start.Length; i++)
{
list_list[i] = head_list[edge_start[i]];
head_list[edge_start[i]] = i;
}
}
}
}