Submission

PPPPPPPPPP

Score: 100

User: qwerty

Problemset: โชว์ของโลมา

Language: cpp

Time: 0.002 second

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

#include<bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    if (n == 1) {
        cout << 1;
        return 0;
    }
    int curr = n;
    int ans = 0;
    int c = 0;
    for (int i = n-1 ; i > 1 ; i--) {
        c++;
        if (c%2==1) {
            curr+=2*i;
            curr%=10;
            ans+=curr;
        } else {
            ans+=(curr+1)%10;
            curr+=2*i;
        }
    }
    ans+=(curr+1)%10;
    ans+=(curr+2)%10;
    cout << ans;
}