#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
typedef long long ll;
const int N = 1000006;
int n, m;
int x[N], y[N];
int** a;
struct ban
{
int s, minu;
int q;
ban()
{
s = minu = 0;
q = 0;
}
ban(int x)
{
s = x;
minu = x;
q = 1;
}
};
ban t[N * 4];
ban mer(const ban& l, const ban& r)
{
ban res;
res.s = l.s + r.s;
if (l.minu < l.s + r.minu)
{
res.minu = l.minu;
res.q = l.q;
}
else if (l.minu > l.s + r.minu)
{
res.minu = l.s + r.minu;
res.q = r.q;
}
else
{
res.minu = l.minu;
res.q = l.q + r.q;
}
return res;
}
void ubd(int tl, int tr, int x, int y, int pos)
{
if (tl == tr)
{
t[pos] = ban(y);
return;
}
int m = (tl + tr) / 2;
if (x <= m)
ubd(tl, m, x, y, pos * 2);
else
ubd(m + 1, tr, x, y, pos * 2 + 1);
t[pos] = mer(t[pos * 2], t[pos * 2 + 1]);
}
void ubdd(int j)
{
if (a[1][j] == n * m + 5)
return;
int q = 0;
if (a[1][j - 1] > a[1][j])
++q;
else
--q;
if (a[1][j + 1] > a[1][j])
++q;
else
--q;
ubd(1, n * m, a[1][j], q, 1);
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C)
{
n = H;
m = W;
for (int i = 0; i < n * m; ++i)
{
x[i + 1] = R[i] + 1;
y[i + 1] = C[i] + 1;
}
a = new int*[n + 5];
for (int i = 0; i < n + 5; ++i)
{
a[i] = new int[m + 5];
for (int j = 0; j < m + 5; ++j)
a[i][j] = n * m + 5;
}
for (int i = 1; i <= n * m; ++i)
{
a[x[i]][y[i]] = i;
}
for (int j = 1; j <= m; ++j)
{
ubdd(j);
}
}
int swap_seats(int u1, int u2)
{
++u1;
++u2;
swap(x[u1], x[u2]);
swap(y[u1], y[u2]);
a[x[u1]][y[u1]] = u1;
a[x[u2]][y[u2]] = u2;
ubdd(y[u1] - 1);
ubdd(y[u1]);
ubdd(y[u1] + 1);
ubdd(y[u1] - 1);
ubdd(y[u1]);
ubdd(y[u1] + 1);
return t[1].q;
}
