Submission

Score: 100

User: erng

Problemset: โชว์ของโลมา

Language: cpp

Time: 0.003 second

Submitted On: 2026-03-11 21:52:36

#include <bits/stdc++.h>

using namespace std;

#define ll long long

ll n, res;

void solve(ll st, ll dim)
{
    if (dim==1)
    {
        res+=st%10;
        return;
    }
    if (dim==2)
    {
        res+=(st+2)%10+(st+3)%10;
        return;
    }
    res+=(st+dim*3-2)%10;
    res+=(st+dim*3-3)%10;
    solve(st+((dim*dim)-(dim-2)*(dim-2)), dim-2);
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    solve(1, n);
    cout<<res;
}