Submission #878335

#	Time	Username	Problem	Language	Result	Execution time	Memory
878335		_unknown_2010	Chessboard (IZhO18_chessboard)	C++17	70 / 100	206 ms	4416 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;
    if(tub(n) && k>0){
        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--;
        if(a%2==b%2){
            s--;f++;
        }
        else {
            s++;f--;
        }
    }
    cout << min(s,f);
    }
    else {
        //vector<vector<int>> vec(n,vector<int>(n,0));
        vector<pair<int,int>> p;
        vector<int> mx;
        while(k--){
        int a,b,c,d;
        cin >> a >> b >> c >> d;
        a--;b--;c--;d--;
        p.pb({a,b});
    }
    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--;
            //             }
            //         }
            //     }
            // }
            for(int k=0; k<p.size(); k++){
                int fg=p[k].ff/i+1;
                int sg=p[k].ss/i+1;
                if(fg%2==sg%2){
                    s++;f--;
                }
                else {
                    f++;s--;
                }
            }
            mx.push_back(f);
            mx.push_back(s);
        }
    }
    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++)
      | 
chessboard.cpp: In function 'void solution()':
chessboard.cpp:90:27: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<std::pair<long int, long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   90 |             for(int k=0; k<p.size(); k++){
      |                          ~^~~~~~~~~

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