Submission #878198

#	Time	Username	Problem	Language	Result	Execution time	Memory
878198		_unknown_2010	Chessboard (IZhO18_chessboard)	C++17	39 / 100	102 ms	262144 KiB

chessboard

//#ifndef LOCAL
//#pragma GCC optimize ("Ofast")
//#pragma GCC optimize ("unroll-loops")
//#endif

#include <bits/stdc++.h>
using namespace std;
using vecp = vector<pair<int,int>>;
#define vecm(a,n,m) vector<vector<int>>a(n,vector<int>(m,0));
#define int int64_t
#define pb  push_back
#define pii pair<int,int>
#define vi vector<int>
#define vii vector<pii>
#define mpii map<int,int>
#define lb lower_bound
#define ub upper_bound
#define foor(i,a,b) for(int i=a;i<b; i++)
#define foor(i,a) foor(i,0,a)
#define ins insert
#define ss second
#define ff first
#define until(x, a) for (auto x : a)
#define ln(x) int(x.size())
#define all(x) (x).begin(), (x).end()
#define seea(a,n) for(int i=0;i<n;i++){cin>>a[i];}
#define seev(v,n) for(int i=0;i<n;i++){int x; cin>>x; v.push_back(x);}
const int mod = 1E9+7;
bool tub(int n){
    for(int i=2; i*i<=n; i++){
        if(n%i==0)return false;
    }
    return true;
}
void solution(){
    int n,k;
    cin >> n >> k;
    vector<vector<int>> vec(n,vector<int>(n,0));
    vector<int> mx;
    int cnt=0;
    int x=k;
    int f=n/2*(n/2+1)*2;
    int s=(n/2+1)*(n/2+1)+(n/2)*(n/2);
    while(k--){
        int a,b,c,d;
        cin >> a >> b >> c >> d;
        a--;b--;c--;d--;
        if(a%2==b%2){
            s--;f++;
        }
        else {
            s++;f--;
        }
        for(int i=a; i<=c; i++){
            for(int j=b; j<=d; j++){
                vec[i][j]=1;
            }
        }
        if(a==c && b==d)cnt++;
    }
    if(tub(n) && cnt==x && cnt!=0)cout << min(s,f);
    else {
    cnt=0;
    for(int i=1; i<=n/2; i++){
        if(n%i==0){
            int x=n/i;
            int f=1e18,s=1e18;
            if(x%2==0){
                f=s=(i*i)*x/2*n/i;
            }
            else {
                s=x/2*(x/2+1)*2*(i*i);
                f=(i*i)*((x/2+1)*(x/2+1)+(x/2)*(x/2));
            }
            for(int k=0; k<n; k++){
                for(int j=0; j<n; j++){
                    int fg=k/i+1;
                    int sg=j/i+1;
                    if(vec[k][j]==1){
                        cnt++;
                        if(fg%2==sg%2){
                            s++;f--;
                        }
                        else {
                            f++;s--;
                        }
                    }
                }
            }
            mx.push_back(f);
            mx.push_back(s);
        }
        cnt=0;
    }
    sort(all(mx));
    cout << mx[0];
    }
}
int32_t main(){
    clock_t tStart = clock();
    std::ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int q = 1; // cin >> q;
    while(q--) {
        solution();
        cout << '\n';
    }
    cerr<<fixed<<setprecision(3)<<"\nTime Taken: "<<(double)(clock()- tStart)/CLOCKS_PER_SEC<<endl;
}
/*

██╗  ██╗ █████╗  ██████╗     ██╗██╗   ██╗ ██████╗████████╗
██║░░██║██╔══██╗██╔════╝░░░░░██║██║░░░██║██╔════╝╚══██╔══╝
███████║██║░░██║╚█████╗░░░░░░██║██║░░░██║╚█████╗░░░░██║░░░
██╔══██║██║░░██║░╚═══██╗██╗░░██║██║░░░██║░╚═══██╗░░░██║░░░
██║░░██║╚█████╔╝██████╔╝╚█████╔╝╚██████╔╝██████╔╝░░░██║░░░
╚═╝░░╚═╝░╚════╝░╚═════╝░░╚════╝░░╚═════╝░╚═════╝░░░░╚═╝░░░
*/

Compilation message (stderr)

chessboard.cpp:19: warning: "foor" redefined
   19 | #define foor(i,a) foor(i,0,a)
      | 
chessboard.cpp:18: note: this is the location of the previous definition
   18 | #define foor(i,a,b) for(int i=a;i<b; i++)
      |

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