Submission #844042

#	Time	Username	Problem	Language	Result	Execution time	Memory
844042		Darren0724	Chessboard (IZhO18_chessboard)	C++17	39 / 100	53 ms	1884 KiB

chessboard

#include <bits/stdc++.h>
using namespace std;
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n,q;cin>>n>>q;
    
    vector<int> v;
    vector<int> a[2];
    for(int i=1;i<n;i++){
        if(n%i==0){
            v.push_back(i);
            int p=n/i;
            if(p&1){
                a[0].push_back((p*p-1)*i*i/2);
                a[1].push_back((p*p+1)*i*i/2);
            }
            else{
                a[0].push_back(n*n/2);
                a[1].push_back(n*n/2);
            }
        }
    }
    int sz=v.size();
    for(int i=0;i<q;i++){
        int c,d;
        cin>>c>>d>>c>>d;
        c--;d--;
        for(int j=0;j<sz;j++){
            int k=v[j];
            int c1=c/k;
            int d1=d/k;
            c1%=2;
            d1%=2;
            c1^=d1;
            if(c1){
                a[0][j]--;
                a[1][j]++;
            }
            else{
                a[0][j]++;
                a[1][j]--;
            }
        }
    }
    int ans=n*n;
    for(int j=0;j<sz;j++){
        ans=min(ans,a[0][j]);
        ans=min(ans,a[1][j]);
    }
    cout<<ans<<endl;


    return 0;
}
/*
6 8
3 3 3 3
1 2 1 2
3 4 3 4
5 5 5 5
4 3 4 3
4 4 4 4
2 1 2 1
3 6 3 6
*/

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