Submission

PPPPPPPPPP

Score: 100

User: admin

Problemset: โชว์ของโลมา

Language: cpp

Time: 0.002 second

Submitted On: 2024-11-25 09:12:53

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    if (n==1) {
        // special case
        cout << 1;
        return 0;
    }
    int k = 0;
    k+=n;
    int C = 0;
    int rnd = 0;
    for (int i=n-1;i>1;i--) {
        rnd++;
        if (rnd%2 == 1) {
            // left + down
            k+=2*i;
            k%=10;
            C += k;
        } else {
            // right
            C += (k+1)%10;
            // up + right
            k+=2*i;
        }
    }
    // last two numbers always added
    C += (k+1)%10;
    C += (k+2)%10;
    cout << C;
    return 0;
}