Help me in solving PARPER problem

help
,
1

My issue

what is wrong int this code ,plz explain…

My code

#include <bits/stdc++.h>
#define ll int long long
using namespace std;
int const mod=1e9+7;


int main() {
	// your code goes here
	ll t;
	cin>>t;
	while(t--){
	    ll n,k;
	    cin>>n>>k;
	    vector<ll>a(n);
	    for(ll i=0;i<n;i++){cin>>a[i];}
	    
	   vector<ll>fac(n+1);
	   fac[0]=1;
	   fac[1]=1;
	   for(ll i=2;i<=n;i++){
	       (fac[i]=i*fac[i-1])%=mod;
	   }
	   ll odd=0,even=0;
	    for(ll i=0;i<n;i++){
	       if(a[i]%2) odd++;
	       else even++;
	    }
	    if(k==0){
	        if(odd==n || even==n){
	            cout<<(fac[n]%mod)<<endl;
	        }
	        else cout<<0<<endl;
	    }
	    if(k==1){
	       if(odd==even){
	           ll ans=1;
	           (ans*=fac[odd])%=mod;
	           (ans*=fac[even])%=mod;
	           (ans*=2)%=mod;
	           cout<<ans<<endl;
	       } 
	   
	       if(odd > even ) swap(odd,even);
	       if(odd+1==even){
	             ll ans=1;
	           (ans*=fac[odd])%=mod;
	           (ans*=fac[even])%=mod;
	           cout<<ans<<endl;
	       }
	       else cout<<0<<endl;
	  
	    }
	}
	return 0;
}

Problem Link: PARPER Problem - CodeChef

2

@deepakjdh31
For test case
1
2 1
2 23
your code is printing
2
0
and the output should be only
2

3

In the code block if(k==1){…}, if (odd==even) holds true, it will print the answer. Further it will move to else statement and print 0 as well. This extra 0 is causing the issue.

Try the test case:

1
6 1
1 2 3 4 5 6

Expected O/P :
72

Your O/P:
72
0