Submission

Status:

PPPPPPPPPP

Score: 100

User: Nakornrat

Problemset: โชว์ของโลมา

Language: cpp

Time: 0.002 second

Submitted On: 2025-03-19 22:23:32

#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
int main()
{
    ios::sync_with_stdio(false);cin.tie(0);
    int n;cin>>n;
    int t = n;
    int sum = 0;
    int state = 0;
    for(int i=n-1;i>=2;i--){
        if(state%2==0){
            t = (t+(i*2)%10)%10;
            sum+=t%10;
            ++state;
        }else{
            sum+=(t+1)%10;
            t = (t+(i*2)%10)%10;
            ++state;
        }
    }
    sum+=(t+1)%10+(t+2)%10;
    cout<<sum<<endl;
}