Submission #896260

#	Time	Username	Problem	Language	Result	Execution time	Memory
896260		CyberCow	Chessboard (IZhO18_chessboard)	C++17	100 / 100	336 ms	2864 KiB

chessboard

#include <random>
#include <algorithm>
#include <bitset>
#include <chrono>
#include <cmath>
#include <deque>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <map>
#include <queue>
#include <set>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include <chrono>
#define fr first
#define sc second
#define ad push_back
using namespace std;
using ll = long long;
mt19937 rnd(348502);

const int N = 100005;

pair<ll, ll> ans[N];

void solve()
{
    ll n, i, j, x, y, x1, y1, k;
    cin >> n >> k;
    vector<ll> baj;
    baj.push_back(1);
    for (i = 2; i * i < n; i++)
    {
        if (n % i == 0)
        {
            baj.push_back(i);
            baj.push_back(n / i);
        }
    }
    if (i * i == n)
        baj.push_back(i);
    for (i = 0; i < baj.size(); i++)
    {
        if ((n / baj[i]) % 2 == 1)
        {
            ans[i] = { (n / baj[i]) * (n / baj[i]) / 2 * baj[i] * baj[i], ((n / baj[i]) * (n / baj[i]) / 2 + 1) * baj[i] * baj[i] };
        }
        else
        {
            ans[i] = { n * n / 2, n * n / 2 };
        }
    }
    for (i = 0; i < k; i++)
    {
        cin >> x >> y >> x1 >> y1;
        for (j = 0; j < baj.size(); j++)
        {
            ll sev, sptiak;
            sev = min((x - 1) / baj[j] * baj[j] + baj[j] + 1, x1 + 1) - x;
            sev += max((x1 / baj[j] * baj[j]) - ((x - 1) / baj[j] * baj[j] + baj[j]), 0LL) / baj[j] / 2 * baj[j];
            if ((max((x1 / baj[j] * baj[j]) - ((x - 1) / baj[j] * baj[j] + baj[j]), 0LL) / baj[j]) % 2 == 1)
            {
                sev += x1 - x1 / baj[j] * baj[j];
            }
            sptiak = x1 - x + 1 - sev;
            ll sevy, sptiaky;
            sevy = min((y - 1) / baj[j] * baj[j] + baj[j] + 1, y1 + 1) - y;
            sevy += max((y1 / baj[j] * baj[j]) - ((y - 1) / baj[j] * baj[j] + baj[j]), 0LL) / baj[j] / 2 * baj[j];
            if ((max((y1 / baj[j] * baj[j]) - ((y - 1) / baj[j] * baj[j] + baj[j]), 0LL) / baj[j]) % 2 == 1)
            {
                sevy += y1 - y1 / baj[j] * baj[j];
            }
            sptiaky = y1 - y + 1 - sevy;
            ll obshisev = sev * sevy + sptiaky * sptiak;
            ll obshisptiak = sevy * sptiak + sptiaky * sev;
            if (((x - 1) / baj[j] + (y - 1) / baj[j]) % 2 == 1)
            {
                ans[j].first -= obshisev - obshisptiak;
                ans[j].second -= obshisptiak - obshisev;
            }
            else
            {
                ans[j].first -= obshisptiak - obshisev;
                ans[j].second -= obshisev - obshisptiak;
            }
        }
    }
    ll anss = 1e18;
    for (i = 0; i < baj.size(); i++)
    {
        anss = min(anss, min(ans[i].first, ans[i].second));
    }
    cout << anss;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int tt = 1;
    //cin >> tt;
    while (tt--) {
        solve();
    }
    return 0;
}

Compilation message (stderr)

chessboard.cpp: In function 'void solve()':
chessboard.cpp:48:19: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |     for (i = 0; i < baj.size(); i++)
      |                 ~~^~~~~~~~~~~~
chessboard.cpp:62:23: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |         for (j = 0; j < baj.size(); j++)
      |                     ~~^~~~~~~~~~~~
chessboard.cpp:95:19: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |     for (i = 0; i < baj.size(); i++)
      |                 ~~^~~~~~~~~~~~

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