Submission #1122503

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122503		kirakosyan	Chessboard (IZhO18_chessboard)	C++20	0 / 100	0 ms	328 KiB

chessboard

#include<algorithm>
#include<iostream>
#include<vector>
#include<string>
#include<random>
#include<cmath>
#include<stack>
#include<map>
#include <iomanip> 
#include <queue>
#include <set>
using namespace std;
using ll = long long;
using ull = unsigned long long;
ll mod = 1e9 + 7;
ll pv(ll a, ll b) {
    if (b == 0)return 1;
    ll res = (pv(a, b / 2));
    if (b % 2) {
        return (((res * res) % mod) * (a % mod)) % mod;
    }
    else {
        return (res * res) % mod;
    }
}
ll gcd(ll n1, ll n2)
{
    if (n2 != 0)
        return gcd(n2, n1 % n2);
    else
        return n1;
}


void solve() {
    ll n, k; cin >> n >> k;
    if (n % 2 == 0) {
        cout << (n / 2) * n << endl;;
    }
    else {
        ll cnt = (n + 1) / 2;
        cout << cnt * (n / 2) + (n - cnt) * cnt << endl;
    }

}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cin.tie(nullptr);

    ll _ = 1;
    //cin >> _;
    while (_--)
    {
        solve();
    }
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 8
• Subtask 3: 0 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 23
• Subtask 6: 0 / 30