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I'm getting WA. can anybody help me pls?

#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<cstring>
using namespace std;

int par[30];


void make_set(int i)
{
par[i] = i;
}

int find(int r)
{

if(par[r]==r) return r;
else
{
return par[r] = find(par[r ...

where to include "\n"
I am trying it in more & more in diff positions but getting WA.