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Subset.cs
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Subset.cs
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using System;
using System.Collections.Generic;
using System.Linq;
public class Subset{
static void Main(string [] args){
int [] arr = new int [] {1,2,3,4,5};
int r = 3;
int len = arr.Length;
combination(arr,len,r);
}
static void combinationUtil(int [] arr,int n,int r,int [] data,int index,int i,IList<IList<int>> res){
if(index ==r){
// for(int j=0;j<r;j++)
// Console.Write(data[j]+" ");
// Console.WriteLine("");
res.Add(data.ToList());
return;
}
if(i>=n)
return;
data[index]=arr[i];
combinationUtil(arr,n,r,data,index+1,i+1,res);
combinationUtil(arr,n,r,data,index,i+1,res);
}
static void combination(int [] arr,int n,int r){
IList<IList<int>> res = new List<IList<int>>();
IList<int> temp = new List<int>();
res.Add(temp);
res.Add(arr.ToList());
for(int i=1;i<n;i++){
int [] data = new int [i];
combinationUtil(arr,n,i,data,0,0,res);
}
Console.WriteLine(res[1][1]);
}
}