//#pragma GCC optomize ("Ofast")
//#pragma GCC optomize ("unroll-loops")
//#pragma GCC target ("avx,avx2,fma")
#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define sz size
#define cl clear
#define ins insert
#define ers erase
#define pii pair < int , int >
#define pll pair< long long , long long >
#define all(x) x.begin() , x.end()
#define ios ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define tostr(x) to_string(x)
#define tonum(s) atoi(s.c_str())
#define seon(x) setprecision(x)
#define bpop(x) __builtin_popcount(x)
#define deb(x) cerr << #x << " = " << x << endl;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;
const double PI = 3.14159265;
const ll N = 1e6+5 , M = 2e3+5;
const ll mod = 1e9+7;
const ll inf = 1e9;
const ll INF = 1e18;
using namespace std;
int n;
bool u[N];
int dp[M][M];
ll check(int k){
int cnt0 = 0 , cnt1 = 0;
int cnt10 = 0 , cnt11 = 0;
for(int i = 0; i < n; i++){
for(int j = 0; j < n; j++){
if((i/k)%2==(j/k)%2) {
if(dp[i][j] == 1) cnt1++;
else cnt0++;
} else {
if(dp[i][j] == 1) cnt11++;
else cnt10++;
}
}
}
return min(cnt0+cnt11 , cnt10+cnt1);
}
void solve(){
ll k;
cin >> n >> k;
if(u[n] == 0){
ll cnt = 0 , cnt1 = 0;
for(int i = 1; i <= k; i++){
ll x , y , x1 , y1;
cin >> x >> y >> x1 >> y1;
if(x % 2 == y % 2) cnt++;
else cnt1++;
}
cout << min((n*n+1)/2-cnt+cnt1 , n*n/2-cnt1+cnt) <<"\n";
return;
} else {
for(int i = 1; i <= k; i++){
ll x , y , x1 , y1;
cin >> x >> y >> x1 >> y1;
x--;
y--;
dp[x][y] = 1;
}
ll mn = INF;
for(int i = 1; i <= sqrtl(n); i++){
if(n*n % i == 0){
mn = min(mn , check(i));
if(i > 1) mn = min(mn , check(n/i));
}
}
cout << mn <<"\n";
}
}
signed main(){
ios;
for(int i = 2; i <= N-5; i++){
if(u[i] == 1) continue;
for(ll j = i*i; j <= N-5; j+=i) u[j] = 1;
}
solve();
return 0;
}
/*
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
*/
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
3 ms |
2388 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
4 ms |
2388 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
3 ms |
2388 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
3 ms |
2388 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
4 ms |
2388 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
3 ms |
2388 KB |
Execution killed with signal 11 |
| 2 |
Halted |
0 ms |
0 KB |
- |
