#include <bits/stdc++.h>
#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define all(s) s.begin(),s.end()
#define int long long
using namespace std;
const int N = (1e5 + 12);
const int mod = (1e9 + 7);
const int INF = (0x3f3f3f3f);
int ans = 1e16;
int n, k, x[2][N], y[2][N];
void calc(int div){
int bl = n / div, cnt = 0, x1, y1;
if(bl & 1){
cnt += div * div * ((bl + 1) / 2) * ((bl + 1) / 2);
cnt += div * div * (bl / 2) * (bl / 2);
for(int i = 1;i <= k; i++){
x1 = x[0][i];
y1 = y[0][i];
x1 = (x1 + bl - 1) / bl;
y1 = (y1 + bl - 1) / bl;
if((x1 + y1) % 2 == 1){
cnt++;
}
else{
cnt--;
}
}
ans = min(ans, cnt);
cnt = 0;
cnt += div * div * ((bl + 1) / 2) * ((bl + 1) / 2);
cnt += div * div * (bl / 2) * (bl / 2);
for(int i = 1;i <= k; i++){
x1 = x[0][i];
y1 = y[0][i];
x1 = (x1 + bl - 1) / bl;
y1 = (y1 + bl - 1) / bl;
if((x1 + y1) % 2 == 0){
cnt++;
}
else{
cnt--;
}
}
ans = min(ans, cnt);
}
else{
cnt += div * div * (bl / 2) * bl;
for(int i = 1;i <= k; i++){
x1 = x[0][i];
y1 = y[0][i];
x1 = (x1 + bl - 1) / bl;
y1 = (y1 + bl - 1) / bl;
if((x1 + y1) % 2 == 1){
cnt++;
}
else{
cnt--;
}
}
ans = min(ans, cnt);
cnt = 0;
cnt += div * div * (bl / 2) * bl;
for(int i = 1;i <= k; i++){
x1 = x[0][i];
y1 = y[0][i];
x1 = (x1 + bl - 1) / bl;
y1 = (y1 + bl - 1) / bl;
if((x1 + y1) % 2 == 0){
cnt++;
}
else{
cnt--;
}
}
ans = min(ans, cnt);
}
}
main()
{
cin >> n >> k;
for(int i = 1;i <= k; i++){
scanf("%lld%lld%lld%lld", &x[0][i], &y[0][i], &x[1][i], &y[1][i]);
}
if(n % 2 == 1){
int x1, y1;
int cnt = n * n / 2ll + 1ll, cnt1 = n * n / 2ll;
for(int i = 1;i <= k; i++){
x1 = x[0][i];
y1 = y[0][i];
if((x1 + y1) % 2 == 0){
cnt--;
cnt1++;
}
else{
cnt++;
cnt1--;
}
}
ans = min(ans, cnt);
ans = min(ans, cnt1);
cnt = n * n / 2ll + 1ll, cnt1 = n * n / 2ll;
for(int i = 1;i <= k; i++){
x1 = x[0][i];
y1 = y[0][i];
if((x1 + y1) % 2 == 1){
cnt--;
cnt1++;
}
else{
cnt++;
cnt1--;
}
}
ans = min(ans, cnt);
ans = min(ans, cnt1);
}
else{
int x1, y1;
int cnt = n * n / 2ll;
for(int i = 1;i <= k; i++){
x1 = x[0][i];
y1 = y[0][i];
if((x1 + y1) % 2 == 0){
cnt--;
}
else{
cnt++;
}
}
ans = min(ans, cnt);
cnt = n * n / 2ll;
for(int i = 1;i <= k; i++){
x1 = x[0][i];
y1 = y[0][i];
if((x1 + y1) % 2 == 1){
cnt--;
}
else{
cnt++;
}
}
ans = min(ans, cnt);
}
//for(int i = 2;i * i <= n; i++){
//if(n % i == 0){
//calc(i);
//calc(n / i);
//}
//}
cout << ans;
}
Compilation message
chessboard.cpp:86:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main()
^
chessboard.cpp: In function 'int main()':
chessboard.cpp:90:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%lld%lld%lld%lld", &x[0][i], &y[0][i], &x[1][i], &y[1][i]);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
256 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
33 ms |
2268 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
376 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
376 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
33 ms |
2268 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
256 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
