Submission

PPPPPPPPPP

Score: 100

User: namnueng_good

Problemset: โชว์ของโลมา

Language: cpp

Time: 0.002 second

Submitted On: 2025-03-25 08:02:02

#include <bits/stdc++.h>
using namespace std;
long long s,re,n;

int main(){
    cin>>n;
    while(true){
        if(n==2){
            re+=(s+4)%10+(s+3)%10;
            break;
        }if(n==1){
            re+=(s+1)%10;
            break;
        }
        s+=n*3-2;
        re+=s%10+(s+1)%10;
        n-=2;
        s+=n;
    }cout<<re;
}