#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define f first
#define s second
#define pii pair<ll,ll>
#define pll pair<ll,ll>
#define pb push_back
#define epb emplace_back
using namespace std;
/*
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
*/
int pos[100001][2];
ll compute_line(ll x1, ll y1, ll x2, ll y2, ll k){
ll u = (x1 / k) + (y1 / k);
ll v = (x2 / k) + )y2 / k);
ll a = (x2 - x1 + 1);
ll b = (y2 - y1 + 1);
ll cnt = 0;
if(u % 2 == v % 2){
if(u & 1){
cnt -= k * a;
}
else cnt += k * a;
}
ll c = k - (y2 % k);
if(u & 1){
cnt -= c * a;
}
else cnt += c * a;
ll d = y1 % k;
d++;
if(v & 1) cnt -= d * a;
else cnt += d * a;
return cnt;
}
ll C(ll x1, ll y1, ll x2, ll y2, ll k){
if(x1 / k == x2 / k){
if(y1 / k == y2 / k){
ll x = x1 / k + y1 / k;
if(x % 2) return -(x2 - x1 + 1) * (y2 - y1 + 1);
return (x2 - x1 + 1) * (y2 - y1 + 1);
}
return compute_line(x1, y1, x2, y2, k);
}
if(y1 / k == y2 / k)
return compute_line(y1, x2, y2, x2, k);
ll cnt = 0;
cnt += compute_line(x1, y1, x1 / k * k + (k - 1), y2, k);
cnt += compute_line(x2 / k * k, y1, x2, y2, k);
ll v = x2 / k;
v -= x1 / k;
v--;
if(v){
ll j = x1 / k * k + k;
ll nw = compute_line(j, y1, j + k, y2, k);
if(v & 1) cnt += nw;
}
return cnt;
}
int main(){
// freopen("school.in", "r", stdin);
// freopen("school.out", "w", stdout);
int n, k;
cin >> n >> k;
int x1[k + 1], x2[k + 1], y1[k + 1], y2[k + 1];
for(int i = 1; i <= k; ++i){
cin >> x1[i] >> y1[i] >> x2[i] >> y2[i];
x1[i]--;
y1[i]--;
x2[i]--;
y2[i]--;
}
ll ans = 1e18 + 1;
for(ll a = 1; a <n; a++){
if(n % a) continue;
ll v = n / a;
ll cnt = 0;
if(v % 2 == 1)
cnt += v * (v / 2) + (v + 1) / 2;
else cnt = v * v / 2;
cnt *= a * a;
for(int i = 1; i <= k; i++){
cnt -= C(x1[i], y1[i], x2[i], y2[i], a);
}
ans = min(ans, cnt);
}
for(ll a = 1; a <n; a++){
if(n % a) continue;
ll v = n / a;
ll cnt = -1;
if(v % 2 == 1)
cnt += v * (v / 2) + (v + 1) / 2;
else cnt = v * v / 2;
cnt *= a * a;
for(int i = 1; i <= k; i++)
cnt += C(x1[i], y1[i], x2[i], y2[i], a);
ans = min(ans, cnt);
}
cout << ans;
return 0;
}
Compilation message
chessboard.cpp: In function 'long long int compute_line(long long int, long long int, long long int, long long int, long long int)':
chessboard.cpp:27:23: error: expected primary-expression before ')' token
27 | ll v = (x2 / k) + )y2 / k);
| ^
chessboard.cpp:29:8: warning: unused variable 'b' [-Wunused-variable]
29 | ll b = (y2 - y1 + 1);
| ^
