Submission #633908

#	Time	Username	Problem	Language	Result	Execution time	Memory
633908		drkarlicio2107	Chessboard (IZhO18_chessboard)	C++14	100 / 100	1360 ms	5804 KiB

chessboard

#include <bits/stdc++.h>
using namespace std;
struct c {
	 long long int x1, y1, x2, y2;
};
c coor [100010];
vector <int> di;
 long long int uk1=0;  long long int sol=0;
 long long int uk2=0;  long long int sol2=0;
 long long int D;
 long long int solve ( long long int x,  long long int y,  long long int p){
	if (x<0 || y<0) return 0;
	 long long int ans=0;  long long int r1, r2;
	 long long int t1=x/D;  long long int t2=y/D;
	if (t1%2==1) r1=(t1/2+1)*D;
	else r1=(t1/2)*D+(x%D);
	if (t1%2==1) r2=(t1/2)*D+(x%D);
	else r2=(t1/2)*D;

	if (t2%2==1) ans=(t2/2+1)*r1*D+(t2/2)*r2*D+r2*(y%D);
	else ans=(t2/2)*r1*D+(t2/2)*r2*D+r1*(y%D);
	
	if (p) ans=(x*y)-ans;
	return ans;
}
void check (c s,  long long int d){
	D=d;
	 long long int x1=s.x1;  long long int x2=s.x2;  long long int y1=s.y1;  long long int y2=s.y2;  long long int poc=sol, poc2=sol2; //x1--; x2--; y1--; y2--;
	sol+=solve (x2, y2, 0)-solve (x2, y1-1, 0)-solve (x1-1, y2, 0)+solve (y1-1, x1-1, 0); uk1+=((x2-x1+1)*(y2-y1+1)-(sol-poc));
	sol2+=solve (x2, y2, 1)-solve (x2, y1-1, 1)-solve (x1-1, y2, 1)+solve (y1-1, x1-1, 1); uk2+=((x2-x1+1)*(y2-y1+1)-(sol2-poc2));
	//cout << sol << " " << sol2 << endl;
	return ;
}
int main(){
	 long long int n, k; cin >> n >> k;
	for ( long long int i=0; i<k; i++){
		cin >> coor [i].x1 >> coor [i].y1 >> coor [i].x2 >> coor [i].y2;
	}
	for ( long long int i=1; i<n; i++){
		if (n%i==0) di.push_back (i);
	}
	 long long int ans=1e18;
	for ( long long int i=0; i<di.size (); i++){
		sol=0; sol2=0; uk1=0; uk2=0;
		for ( long long int j=0; j<k; j++){
			check (coor [j], di [i]);
		}
		 long long int u1, u2;
		u1=(((n/di[i])*(n/di[i]))/2*di[i]*di[i]);
		u2=n*n-u1;
		ans=min(ans, min(u1-uk1+sol, u2-uk2+sol2));
		//cout << u1 << " " << u2 << endl;
		//cout << min(u1-uk1+sol, u2-uk2+sol2) << endl;
	}
	cout << ans;
	return 0;
}

Compilation message (stderr)

chessboard.cpp: In function 'int main()':
chessboard.cpp:43:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |  for ( long long int i=0; i<di.size (); i++){
      |                           ~^~~~~~~~~~~

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