Help me in solving CNDY problem

help
,
1

My issue

Why segmentation error is coming?

My code

#include <bits/stdc++.h>
using namespace std;
int main() 
{
    int t;
    cin>>t;
    int n;
    int a[2*n];
    for(int i=1;i<=t;i++)
    {
        cin>>n;
        for(int j=0;j<2*n;j++)
        {
            cin>>a[j];
        }
        int l=0;
        int count=0;
        for(int k=i+1;k<2*n;k++)
        {
            if(a[l]==a[k])
            {
                count++;
            }
            if(k==2*n-1)
            {
                l++;
            }
            if(count>2)
            {
                cout<<endl<<"no";
                break;
            }
        }
        cout<<endl<<"yes";
    }
}

Problem Link: Candies Practice Coding Problem

2

@nikhilagarwal2
plzz refer my c++ code

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

int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        int n;
        cin >> n;
        int size = 2 * n;
        int a[size];
        for (int i = 0; i < size; i++)
        {
            cin >> a[i];
        }

        sort(a,a+size);
        string s = "YES";
        
        for (int i = 0; i < size-2; i++)
        {
            if(a[i]==a[i+1] && a[i+1]==a[i+2]){
                s="NO";
            }
        }
        cout<<s<<"\n";
        
    }
    return 0;
}