oj.uz

Submission #342870

# Submission time Handle Problem Language Result Execution time Memory
342870 2021-01-03T05:01:12 Z Rakhmand Chessboard (IZhO18_chessboard) C++14
0 / 100
 25 ms 1260 KB 
//
//  main.cpp
//  torelax
//
//  Created by Rakhman on 11/15/20.
//

#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>
#include <iterator>

#define ios ios_base::sync_with_stdio(0), cout.tie(0), cin.tie(0);
#define S second
#define F first
#define pb push_back
#define nl '\n'
#define NL cout << '\n';
#define EX exit(0)
#define all(s) s.begin(), s.end()
#define no_answer {cout << "NO"; exit(0);}
#define FOR(i, start, finish, k) for(llong i = start; i <= finish; i += k)

const long long mxn = 2e6 + 110;
const long long mnn = 1e3 + 2;
const long long mod = 1e9 + 7;
const long long inf = 1e18;
const long long OO = 1e9;

typedef long long llong;
typedef unsigned long long ullong;

using namespace std;

int n, k;
llong ans = inf;

struct dot{
    int left, up, right, down;
}b[mxn];

llong get_color(int x, int y, int d){
    return (((x - 1) / d) + ((y - 1) / d)) % 2;
}

llong get(llong d){
    //left-corner is black
    llong blacks = d * d * (n / d) * (n / d / 2);
    if((n / d) % 2 == 1){
        blacks += d * d * (n / d / 2 + 1);
    }
    llong paint = 0;
    llong whites = blacks;
    for(int i = 1; i <= k; i++){
        int x = b[i].left, y = b[i].up;
        if(get_color(x, y, d) == 0){
            blacks--;
        }else{
            paint++;
        }
    }
    llong cnt1 = blacks + paint;
    paint = 0;
    for(int i = 1; i <= k; i++){
        int x = b[i].left, y = b[i].up;
        if(get_color(x, y, d) == 1){
            paint++;
        }else{
            whites--;
        }
    }
    llong cnt2 = whites + paint;
    return min(cnt1, cnt2);
}

int main() {
    ios;
    cin >> n >> k;
    for(int i = 1; i <= k; i++){
        cin >> b[i].left >> b[i].up >> b[i].right >> b[i].down;
    }
    for(int i = 1; i <= sqrt(n); i++){
        if(n % i == 0){
            ans = min(ans, get(i));
            if(n / i != i && i != 1){
                ans = min(get(n / i), ans);
            }
        }
    }
    
    cout << ans;
}


/*
 6 8
 3 3 3 3
 1 2 1 2
 3 4 3 4
 5 5 5 5
 4 3 4 3
 4 4 4 4
 2 1 2 1
 3 6 3 6
 
 */

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Incorrect 0 ms 364 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 1260 KB Output is correct
2 Incorrect 7 ms 620 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 1260 KB Output is correct
2 Incorrect 7 ms 620 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Incorrect 0 ms 364 KB Output isn't correct
3 Halted 0 ms 0 KB -