Submission #898134

#	Time	Username	Problem	Language	Result	Execution time	Memory
898134		marcid	Chessboard (IZhO18_chessboard)	C++17	8 / 100	24 ms	5196 KiB

chessboard

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define vi vector<int>
#define ii pair<int,int>
#define iii tuple<int,int,int>
#define vii vector<ii>
#define viii vector<iii>
#define vb vector<bool>
#define pb push_back
#define eb emplace_back
const int maxn = 1e5+6;
const int inf = 1e18;
//010000 
//100000
//001101
//001100
//000010
//000000
//
//00000 
//00000
//00000
//00000
//00000
//
//what we need: number of painted black cells, number of cells, area of each square, 
void solve() { 
    int n, k; cin >> n >> k;
    if(!k){cout << n*n/2;exit(0);}
    int cells = n*n, bcells = 0, blacks = 0;
    vii top(k), bottom(k);
    set<int> factors; vi divs;
    for (int i = 0; i < k; i++) {
        cin >> top[i].first >> top[i].second >> bottom[i].first >> bottom[i].second;
        bcells += abs(top[i].first-bottom[i].first+1)*abs(top[i].second-bottom[i].second+1);
        blacks += (top[i].first+top[i].second)&1;
    } for (int i = 2; i*i<=n; i++) {
        if (n%i==0) factors.insert(i), factors.insert(n/i);
    } for (int i : factors) divs.eb(i);
    int mn = min(bcells+cells/2-2*blacks,cells-cells/2-bcells+2*blacks);
    for (int i = 0; i < divs.size(); i++) {
        int side = divs[i];
        int cntsq = n/side; // each
        
        //mn=min(mn,min(x,y));
    } cout << mn;// << ' ' << bcells << ' ' << blacks;
}
signed main() {
	cin.tie()->sync_with_stdio(0);
	int tc = 1;
	//cin >> tc;
	while (tc--) {
		solve(); 
        cout << '\n';
	}
}

Compilation message (stderr)

chessboard.cpp: In function 'void solve()':
chessboard.cpp:44:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |     for (int i = 0; i < divs.size(); i++) {
      |                     ~~^~~~~~~~~~~~~
chessboard.cpp:46:13: warning: unused variable 'cntsq' [-Wunused-variable]
   46 |         int cntsq = n/side; // each
      |             ^~~~~

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