Submission #172752

#	Time	Username	Problem	Language	Result	Execution time	Memory
172752		muhammad_hokimiyon	Chessboard (IZhO18_chessboard)	C++14	70 / 100	693 ms	7804 KiB

chessboard

#include <bits/stdc++.h>

//#pragma GCC optimize("Ofast")

#define fi first
#define se second
#define ll long long

using namespace std;

const int N = 2e5 + 7;
const int M = 23;
const int mod = 998244353;

ll n,k;
ll A[N];
ll B[N];
ll C[N];
ll D[N];

void solve1()
{
    cin >> n >> k;
    vector < ll > div;
    for( int i = 1; i < n; i++ ){
        if( n % i == 0 )div.push_back(i);
    }
    for( int i = 0; i < k; i++ ){
        cin >> A[i] >> B[i] >> C[i] >> D[i];
    }
    ll ans = 1e14;
    for( int i = 0; i < (int)div.size(); i++ ){
        ll nn = n / div[i];
        ll B1 = (nn + 1) / 2;
        ll B2 = nn / 2;
        B1 *= div[i] * div[i];
        B2 *= div[i] * div[i];
        B1 *= (nn + 1) / 2;
        B2 *= nn / 2;
        B1 += B2;
        ll B3 = (nn) / 2;
        ll B4 = (nn + 1) / 2;
        B3 *= div[i] * div[i];
        B4 *= div[i] * div[i];
        B3 *= (nn + 1) / 2;
        B4 *= (nn) / 2;
        B3 += B4;
        vector < ll > w(k , 0);
        vector < ll > b(k , 0);
        for( int j = 0; j < k; j++ ){
            //ll x = f(C[j] , D[j] , div[i]) - f(C[j] , B[j] - 1 , div[i]) -
            //f(A[j] - 1, D[j] , div[i]) + f(A[j] - 1 , B[j] - 1 , div[i]);
            //ll y = (C[j] - A[j]) * (D[j] - B[j]);
            ll x = 0;
            ll y = 1;
            if( (A[j] - 1) / div[i] % 2 == 0 && (B[j] - 1) / div[i] % 2 == 0 ){
                x = 1;
            }
            if( (A[j] - 1) / div[i] % 2 == 1 && (B[j] - 1) / div[i] % 2 == 1 ){
                x = 1;
            }
            w[j] = y - x;
            b[j] = x;
        }
        ll x = 0;
        ll y = 0;
        //cout << B1 << " " << B3 << " ";
        for( int j = 0; j < k; j++ ){
            B1 -= b[j];
            x += 1 - b[j];
            y += b[j];
            B3 -= 1 - b[j];
        }
        //cout << B1 + x << " " << B3 + y << " " << div[i] << "\n";
        ans = min(ans , B1 + x);
        ans = min(ans , B3 + y);
    }
    cout << ans;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    //freopen( "input.txt" , "r" , stdin );
    //freopen( "output.txt" , "w" , stdout );

    int cghf = 1;//cin >> cghf;
    while( cghf-- ){
        solve1();
    }
}

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