Submission #334333

#	Time	Username	Problem	Language	Result	Execution time	Memory
334333		talant117408	Chessboard (IZhO18_chessboard)	C++17	0 / 100	25 ms	4332 KiB

chessboard

/*
    Code written by Talant I.D.
*/
  
#include <bits/stdc++.h>
  
using namespace std;
  
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
  
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
  
inline bool isvowel(char ch){
    ch = tolower(ch);
    return (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u');
}
  
inline bool isprime(int n){
    if(n < 2 || (n%2 == 0 && n != 2)) return false;
    for(int i = 3; i*i <= n; i++)
        if(n%i == 0) return false;
    return true;
}
 
class Union{
    private:
        vector <int> saizu, link;
    public:
        Union(int n){
            saizu.assign(n, 1); link.resize(n); 
            iota(all(link), 0);
        }
        int find(int n){
            if(link[n] == n) return n;
            return link[n] = find(link[n]);
        }
        int same(int a, int b){
            return find(a) == find(b);
        }
        void unite(int a, int b){
            if(same(a, b)) return;
             
            a = find(a); b = find(b);
            if(saizu[a] < saizu[b]) swap(a, b);
             
            saizu[a] += saizu[b];
            link[b] = a;
        }
        int getsize(int a){
            return saizu[find(a)];
        }
};
 
const int mod = 1e9+7;
 
ll mode(ll a){
    a %= mod;
    if(a < 0) a += mod;
    return a;
}
 
ll subt(ll a, ll b){
    return mode(mode(a)-mode(b));
}
 
ll add(ll a, ll b){
    return mode(mode(a)+mode(b));
}
 
ll mult(ll a, ll b){
    return mode(mode(a)*mode(b));
}
 
ll binpow(ll a, ll b){
    ll res = 1;
    while(b){
        if(b&1) res = mult(res, a);
        a = mult(a, a);
        b >>= 1;
    }
    return res;
}

#define vl vector <ll> 

const int N = 1e5+7;
ll n, k;

ll calc1(ll div, vl x1, vl y1, vl x2, vl y2){
    ll to_white = 0, to_black = ((n*n/div/div)&1 ? (n*n/div/div/2+1)*div*div : (n*n/2));
            
    for(ll j = 0; j < k; j++){
        for(ll w = x1[j]; w <= x2[j]; w++){
            for(ll o = y1[j]; o <= y2[j]; o++){
                   ll cnt = w/div+o/div;
                   if(cnt%2 == 0)   to_black--;
                   else             to_white++;
            }
        }
    }
    
    return to_white+to_black;
}

ll calc2(ll div, vl x1, vl y1, vl x2, vl y2){
    ll to_white = 0, to_black = (n*n/div/div/2);
    to_black *= div*div;
    
    for(ll j = 0; j < k; j++){
        for(ll w = x1[j]; w <= x2[j]; w++){
            for(ll o = y1[j]; o <= y2[j]; o++){
                   ll cnt = w/div+o/div;
                   if(cnt%2 == 0)  to_white++;
                   else            to_black--;
            }
        }
    }
    
    return to_white+to_black;
}

int main(){
    do_not_disturb
    
    ll ans = 9e18, i;
    cin >> n >> k;
    vector <ll> x1(k), y1(k), x2(k), y2(k);
    
    for(i = 0; i < k; i++){
        cin >> x1[i] >> y1[i] >> x2[i] >> y2[i];
        x1[i]--; y1[i]--; x2[i]--; y2[i]--;
    }
    
    for(i = 1; i*i <= n; i++){
        if(n%i == 0){
            ans = min(ans, calc1(i, x1, y1, x2, y2));
            if(i > 1)
                ans = min(ans, calc2(n/i, x1, y1, x2, y2));
        }
    }
    
    cout << ans << 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