Submission

PPPPPPPPPP

Score: 100

User: FotoFatTurtle

Problemset: โชว์ของโลมา

Language: cpp

Time: 0.002 second

Submitted On: 2025-03-19 23:18:15

#include <bits/stdc++.h>
using namespace std;
int main(void)
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    long long num,mwit,ans=0;
    //cout<<o<<" "<<k<<"\n";
    cin>>num;
    if(num==1)
    {
        cout<<"1";
        return 0;
    }
    mwit=num;
    long long k=(num/2)*2,o=num-1;
    k-=4;
    if(num%2==0)
    {
        mwit-=2;
        ans+=(num*num)%10;
        ans+=(num*num-1)%10;
        k--;
    }
    else
    {
        mwit-=3;
        ans+=(num*num)%10;
        ans+=(num*num-1)%10;
        ans+=(num*num-2)%10;
    }
    long long kha;
    if(mwit!=0)
    {
        mwit-=2;
        ans+=((num*2)+(num-2))%10;
        ans+=((num*2)+(num-2)+1)%10;
        kha=(num*2)+(num-2)+1;
        //cout<<(num*2)+(num-2)<<"\n"<<(num*2)+(num-2)+1<<"\n";
        while(mwit!=0)
        {
            kha+=(2*o);
            kha+=(2*k);
            kha++;
            //cout<<o<<" "<<k<<"\n";
            ans+=(kha)%10;
            ans+=(kha+1)%10;
            kha++;
            //cout<<kha<<"\n"<<kha+1<<"\n";
            o-=2;
            mwit-=2;
            k-=2;
        }
    }
    cout<<ans;
}