Problem: 2063B - Subsequence Update
Language: C++20 (GCC 13-64)

Previous submission (verdict: Wrong answer on test 2):
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
typedef long long int ll;


using namespace std;
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define mod 1000000007



ll lcm(ll a,ll b)
{
    return (a*b)/__gcd(a,b);
}


ll binExp(ll a,ll b)
{
    if(b==0)
        return 1;

    ll res=binExp(a,b/2);

    if(b&1)
    {
        return (a*res*res)%mod;

    }
    else
    {
        return (res*res)%mod;
    }
}


bool isPrime(long long  n)
{
    if (n <= 1)
        return false;
    if (n <= 3)
        return true;
    if (n % 2 == 0 || n % 3 == 0)
        return false;

    for (long long i = 5; i * i <= n; i += 6)
    {
        if (n % i == 0 || n % (i + 2) == 0)
            return false;
    }

    return true;
}

class DisjointSet
{

public:
    vector<ll> parent,rnk,sz;
    DisjointSet(ll n)
    {
        rnk.resize(n+1,0);
        parent.resize(n+1);
        sz.resize(n+1);

        for(ll i=0; i<=n; i++)
        {
            parent[i]=i;
            sz[i]=1;
        }
    }

    ll findUPar(ll node)
    {
        if(node==parent[node])
        {
            return node;
        }
        return parent[node]=findUPar(parent[node]);
    }

    bool unionByRank(ll u,ll v)
    {
        ll ulp_u=findUPar(u);
        ll ulp_v=findUPar(v);

        if(ulp_u==ulp_v)
        {
            return false;
        }
        if(rnk[ulp_u]==rnk[ulp_v])
        {
            parent[ulp_u]=ulp_v;
            rnk[ulp_v]++;
        }
        else if(rnk[ulp_u]<rnk[ulp_v])
        {
            parent[ulp_u]=ulp_v;
        }
        else if(rnk[ulp_v]<rnk[ulp_u])
        {
            parent[ulp_v]=ulp_u;
        }
        return true;
    }

    bool unionBYSize(ll u,ll v)
    {
        ll ulp_u=findUPar(u);
        ll ulp_v=findUPar(v);
        if(ulp_u==ulp_v)
            return false;

        if(sz[ulp_u]<sz[ulp_v])
        {
            parent[ulp_u]=ulp_v;
            sz[ulp_v]+=sz[ulp_u];
        }
        else
        {
            parent[ulp_v]=ulp_u;
            sz[ulp_v]+=sz[ulp_u];
        }
        return true;
    }




};

class segmentTree
{

    vector<ll> segArray;

public:
    segmentTree(ll n)
    {
        segArray.resize(4*n);
    }

    void build(ll index,ll low,ll high,vector<ll> &arr)
    {
        if(low==high)
        {
            segArray[index]=arr[low];
            return;
        }

        ll mid = (low+high)/2;

        build(2*index+1,low,mid,arr);
        build(2*index+2,mid+1,high,arr);

        segArray[index] = min(segArray[2*index+1],segArray[2*index+2]);
    }

    ll query(ll index,ll low,ll high,ll l,ll r)
    {
        // no overlap
        ///[low high l r] or [l r low high]

        if(high<l || low>r)
        {
            return LONG_MAX;
        }


        // Complete Overlap
        /// [l low high r]

        if(low>=l && high<=r)
        {
            return segArray[index];
        }

        /// Partial overlap

        ll mid = (low+high)/2;

        ll left=query(2*index+1,low,mid,l,r);
        ll right=query(2*index+2,mid+1,high,l,r);

        return min(left,right);


    }

    void update(ll index,ll low,ll high,ll updateIndex,ll value)
    {
        if(low==high)
        {
            segArray[index]=value;
            return;
        }

        ll mid=(low+high)/2;

        if(updateIndex<=mid)
            update(2*index+1,low,mid,updateIndex,value);
        else
            update(2*index+2,mid+1,high,updateIndex,value);

        segArray[index]=min(segArray[2*index+1],segArray[2*index+2]);
    }

    void display()
    {
        for(auto s:segArray)
        {
            cout<<s<<" ";
        }
        cout<<endl;
    }


};





void solve()
{
   ll n,a,b;
   cin>>n>>a>>b;


   ll arr[n];

   for(ll i=0; i<n; i++)
   {
       cin>>arr[i];
   }

   ll len=(b-a)+1;

   ll ans=0;

   sort(arr,arr+n);

   ll i=0;

   ll temp=len;

   while(temp--)
   {
       ans+=arr[i];
       i++;

   }





   cout<<ans<<endl;


}





















int main()
{


    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);





    ll t;
    cin>>t;
   // t=1;








    ll caseNo=1;



    while(t--)
    {
        // cout<<"Case "<<caseNo<<": ";
        // caseNo++;


        solve();


    }
    return 0;




}









Submission (verdict: Wrong answer on test 2):
#include<bits/stdc++.h>

#include <ext/pb_ds/assoc_container.hpp>

#include <ext/pb_ds/tree_policy.hpp>

typedef long long int ll;





using namespace std;

using namespace __gnu_pbds;

#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>

#define mod 1000000007







ll lcm(ll a,ll b)

{

    return (a*b)/__gcd(a,b);

}





ll binExp(ll a,ll b)

{

    if(b==0)

        return 1;



    ll res=binExp(a,b/2);



    if(b&1)

    {

        return (a*res*res)%mod;



    }

    else

    {

        return (res*res)%mod;

    }

}





bool isPrime(long long  n)

{

    if (n <= 1)

        return false;

    if (n <= 3)

        return true;

    if (n % 2 == 0 || n % 3 == 0)

        return false;



    for (long long i = 5; i * i <= n; i += 6)

    {

        if (n % i == 0 || n % (i + 2) == 0)

            return false;

    }



    return true;

}



class DisjointSet

{



public:

    vector<ll> parent,rnk,sz;

    DisjointSet(ll n)

    {

        rnk.resize(n+1,0);

        parent.resize(n+1);

        sz.resize(n+1);



        for(ll i=0; i<=n; i++)

        {

            parent[i]=i;

            sz[i]=1;

        }

    }



    ll findUPar(ll node)

    {

        if(node==parent[node])

        {

            return node;

        }

        return parent[node]=findUPar(parent[node]);

    }



    bool unionByRank(ll u,ll v)

    {

        ll ulp_u=findUPar(u);

        ll ulp_v=findUPar(v);



        if(ulp_u==ulp_v)

        {

            return false;

        }

        if(rnk[ulp_u]==rnk[ulp_v])

        {

            parent[ulp_u]=ulp_v;

            rnk[ulp_v]++;

        }

        else if(rnk[ulp_u]<rnk[ulp_v])

        {

            parent[ulp_u]=ulp_v;

        }

        else if(rnk[ulp_v]<rnk[ulp_u])

        {

            parent[ulp_v]=ulp_u;

        }

        return true;

    }



    bool unionBYSize(ll u,ll v)

    {

        ll ulp_u=findUPar(u);

        ll ulp_v=findUPar(v);

        if(ulp_u==ulp_v)

            return false;



        if(sz[ulp_u]<sz[ulp_v])

        {

            parent[ulp_u]=ulp_v;

            sz[ulp_v]+=sz[ulp_u];

        }

        else

        {

            parent[ulp_v]=ulp_u;

            sz[ulp_v]+=sz[ulp_u];

        }

        return true;

    }









};



class segmentTree

{



    vector<ll> segArray;



public:

    segmentTree(ll n)

    {

        segArray.resize(4*n);

    }



    void build(ll index,ll low,ll high,vector<ll> &arr)

    {

        if(low==high)

        {

            segArray[index]=arr[low];

            return;

        }



        ll mid = (low+high)/2;



        build(2*index+1,low,mid,arr);

        build(2*index+2,mid+1,high,arr);



        segArray[index] = min(segArray[2*index+1],segArray[2*index+2]);

    }



    ll query(ll index,ll low,ll high,ll l,ll r)

    {

        // no overlap

        ///[low high l r] or [l r low high]



        if(high<l || low>r)

        {

            return LONG_MAX;

        }





        // Complete Overlap

        /// [l low high r]



        if(low>=l && high<=r)

        {

            return segArray[index];

        }



        /// Partial overlap



        ll mid = (low+high)/2;



        ll left=query(2*index+1,low,mid,l,r);

        ll right=query(2*index+2,mid+1,high,l,r);



        return min(left,right);





    }



    void update(ll index,ll low,ll high,ll updateIndex,ll value)

    {

        if(low==high)

        {

            segArray[index]=value;

            return;

        }



        ll mid=(low+high)/2;



        if(updateIndex<=mid)

            update(2*index+1,low,mid,updateIndex,value);

        else

            update(2*index+2,mid+1,high,updateIndex,value);



        segArray[index]=min(segArray[2*index+1],segArray[2*index+2]);

    }



    void display()

    {

        for(auto s:segArray)

        {

            cout<<s<<" ";

        }

        cout<<endl;

    }





};











void solve()

{

   ll n,a,b;

   cin>>n>>a>>b;





   ll arr[n];



   for(ll i=0; i<n; i++)

   {

       cin>>arr[i];

   }



   ll len=(b-a)+1;









   ll sum=0;



   if(len==n)

   {

       for(ll i=0; i<n; i++)

       {

           sum+=arr[i];

       }

       cout<<sum<<endl;

       return;

   }



   for(ll i=a-1; i<b; i++)

   {

       sum+=arr[i];

   }



   ll ans=0;



   sort(arr,arr+n);



   ll i=0;



   ll temp=len;



   while(temp--)

   {

       ans+=arr[i];

       i++;



   }



   if(ans==sum)

   {

       ans-=arr[len-1];

       ans+=arr[len];

   }











   cout<<ans<<endl;





}











































int main()

{





    ios_base::sync_with_stdio(false);

    cin.tie(NULL);

    cout.tie(NULL);











    ll t;

    cin>>t;

   // t=1;

















    ll caseNo=1;







    while(t--)

    {

        // cout<<"Case "<<caseNo<<": ";

        // caseNo++;





        solve();





    }

    return 0;









}