Friends Pairing Problem

#1

Here is my code :

Its showing wrong ans.

#include<bits/stdc++.h>
#define ll long long
using namespace std;

int pairFriends(int n) {
if(n == 0 || n == 1) {
return 1;
}
return pairFriends(n - 1) + (n - 1) * pairFriends(n-2);
}

int main()
{
int t; cin >> t;
while(t–) {
int n; cin >> n;
cout << pairFriends(n) << endl;
}
return 0;
}

#2

Hi @deep_01,
Chane the return type of pairFriends from int to ll

ll pairFriends(int n) {

#3

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