Submission

Score: 50

User: theem1502

Problemset: โชว์ของโลมา

Language: cpp

Time: 0.010 second

Submitted On: 2026-02-15 11:12:07

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

int main() {
    long long num;
    cin >> num;
    long long sum = 0;
    long long counter = 1;
    long long thenum = 1;
    if (num % 2 == 0) {


    while(thenum < num * num) {
       //     cout << "num = " <<sum << "\n";

        //thenum += (num - (counter-1) * 2) - 1;

      // thenum++;

      long long a = num - (counter - 1) * 2;
long long b = num - counter * 2;

thenum +=  a;

     if (thenum > num * num) {
            break;
        }


        if ((counter == num / 2 && num % 2 ==0) || (counter == num / 2 + 1 && num % 2 == 1)) {
             //   cout << "f";
            sum += thenum % 10;
        //    cout << "thenum " << thenum << "\n";
          //  cout << "aded " << thenum % 10;
        }
        thenum += a - 1;

/*
        if (counter == num / 2) {
                cout << "f";
            sum += thenum % 10;
            cout << "tthenum " << thenum << "\n";
            cout << "added " << thenum % 10;
        }
*/

thenum += b;




      //  thenum += (num - (counter-1) * 2) - 1;
        if (thenum > num * num) {
            break;
        }
        /*
         if (counter == num / 2) {
             cout << "n";
            sum += thenum % 10;
        }
        */

        //thenum + num - counter * 2;

    //    thenum += 2*(num - (counter - 1) * 2) - 1 + num - counter * 2;
        if (thenum > num * num) {
            break;
        }
      //  cout << "first " << thenum << " ";
        sum += thenum % 10;
        thenum++;
        if (thenum > num * num) {
            break;
        }
        sum += thenum % 10;
        thenum += num - (counter * 2);
        if (thenum > num * num) {
            break;
        }
    //    cout << "second " << thenum << " ";
        counter++;
    }


    }
    if (num % 2 == 1) {
         while(thenum < num * num) {
          // cout << "num = " <<sum << "\n";

        //thenum += (num - (counter-1) * 2) - 1;

      // thenum++;

      long long a = num - (counter - 1) * 2;
long long b = num - counter * 2;

thenum +=  a;

     if (thenum > num * num) {
            break;
        }


        if ((counter == num / 2 && num % 2 ==0) || (counter == num / 2 + 1 && num % 2 == 1)) {
             //   cout << "f";
            sum += thenum % 10;
        //   cout << "thenum " << thenum << "\n";
         //   cout << "aded " << thenum % 10;
        }
        thenum += a - 1;


//cout << "yes";
        if (num - counter - b < 2) {
                cout << "yes";
            for (long long i = 1; i < num + 1; i++) {
                cout<< "debug " << thenum  + i << "\n";
                sum += thenum + i;
            }
            break;
        }
/*
        if (counter == num / 2) {
                cout << "f";
            sum += thenum % 10;
            cout << "tthenum " << thenum << "\n";
            cout << "added " << thenum % 10;
        }
*/

thenum += b;




      //  thenum += (num - (counter-1) * 2) - 1;
        if (thenum > num * num) {
            break;
        }
        /*
         if (counter == num / 2) {
             cout << "n";
            sum += thenum % 10;
        }
        */

        //thenum + num - counter * 2;

    //    thenum += 2*(num - (counter - 1) * 2) - 1 + num - counter * 2;
        if (thenum > num * num) {
            break;
        }
       // cout << "first " << thenum << " ";
        sum += thenum % 10;
        thenum++;
        if (thenum > num * num) {
            break;
        }
        sum += thenum % 10;
        thenum += num - (counter * 2);
        if (thenum > num * num) {
            break;
        }
       // cout << "second " << thenum << " ";
        counter++;
    }
    }


    if (num == 1) {
        cout << 1;
        return 0;

    }
    cout << sum;

}