Submission #894704

#	Time	Username	Problem	Language	Result	Execution time	Memory
894704		CyberCow	Chessboard (IZhO18_chessboard)	C++17	0 / 100	18 ms	600 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<int, int> ans[N];

void solve()
{
    int n, i, j, x, y, x1, y1, k;
    cin >> n >> k;
    vector<int> 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 < k; i++)
    {
        cin >> x >> y >> x1 >> y1;
        if (x != x1 || y != y1)
        {
            while (1)
            {
                x = x;
            }
        }
        for ( j = 0; j < baj.size(); j++)
        {
            if (((x - 1) / baj[j] + (y - 1) / baj[j]) % 2 == 1)
            {
                ans[j].first--;
                ans[j].second++;
            }
            else
            {
                ans[j].first++;
                ans[j].second--;
            }
        }
    }
    ll anss = 1e18;
    for ( i = 0; i < baj.size(); i++)
    {
        anss = min(anss, ll(n) * n / 2 + 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:58:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |         for ( j = 0; j < baj.size(); j++)
      |                      ~~^~~~~~~~~~~~
chessboard.cpp:73:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |     for ( i = 0; i < baj.size(); i++)
      |                  ~~^~~~~~~~~~~~

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