Submission #88085

#	Time	Username	Problem	Language	Result	Execution time	Memory
88085		cvetoslav	Chessboard (IZhO18_chessboard)	C++17	0 / 100	29 ms	508 KiB

chessboard

#include<bits/stdc++.h>
using namespace std;
void freesubtask1(int n)
{
    int minx=n*n;
    for(int d=2;d*d<=n;d++)
    {
        if(n%d==0)
        {
            int x=n/d;
            minx=min(minx,d*d/2*x*x);
        }
    }
    cout<<minx<<endl;
}
void freesubtask2(int n,int k)
{
    int br1=0,br2=0;
    for(int i=0;i<k;i++)
    {
        int x,y;
        cin>>x>>y>>x>>y;
        if(x%2==y%2) br1++;
        else br2++;
    }
    cout<<min(n*n/2-br2+br1,n*n/2+n%2-br1+br2)<<endl;
}
bool is_prime(int n)
{
    for(int i=2;i*i<=n;i++)
        if(n%i==0) return 0;
    return 1;
}
int main()
{
    ios_base::sync_with_stdio(0);
    srand(time(0));
    int n,k;
    cin>>n>>k;
    if(k==0) freesubtask1(n);
    else if(is_prime(n)) freesubtask2(n,k);
    else cout<<n*n/2<<endl;
    return 0;
}

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