import java.io.*;
class party
{
public static void main(String args[])throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("enter the number of friends ");
int n=Integer.parseInt(br.readLine());
int i,j;
int free[][]=new int[n][31];
if(n>1)
{
for(i=0;i<n;i++)
{
System.out.println("enter the freeb date of friend="+(i+1));
for(j=0;j<31;j++)
{
free[i][j]=Integer.parseInt(br.readLine());
if(free[i][j]==0)
{
break;
}}} int arr1[]=new int[31];int x=0;
for(i=0;i<31;i++)
{int temp=free[0][i];int c=0;
for(j=1;j<n;j++)
{
for(int k=0;k<31;k++)
{
if(temp==free[j][k]&&temp!=0)
{
c=c+1;
}
}
if(c==(n-1))
{
arr1[x]=temp;x++;
}
}
}
if(x>2)
{System.out.print("Suitable date for party is ");
for(i=0;i<x-2;i++)
{
System.out.print(arr1[i]+",");
}
System.out.print(arr1[x-1]+"and"+arr1[x-2]);
}
else if(x==2)
{
System.out.print("Suitable date for party is ");
System.out.print(arr1[0]+"and"+arr1[1]);
}
else
{
System.out.print("suitable date for party is "+arr1[0]);}}
else{
System.out.println("he may be always free on such date");
}
}}
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