#include "seats.h"
#include<bits/stdc++.h>
using namespace std;
const int N = 1e6 + 5, INF = 1e9, G = 5;
int n, m, len;
vector<int> x, y;
vector<vector<int>> num;
int mn[N * 4], ct[N * 4], up[N * 4];
void push(int v, int L, int R) {
if (up[v]) {
if (L != R) {
up[v * 2] += up[v];
up[v * 2 + 1] += up[v];
}
mn[v] += up[v];
up[v] = 0;
}
}
void upd(int l, int r, int x, int v, int L, int R) {
push(v, L, R);
if (l > r)
return;
if (l == L && r == R) {
up[v] += x;
push(v, L, R);
}
else {
int m = (L + R) >> 1;
upd(l, min(m, r), x, v * 2, L, m);
upd(max(m + 1, l), r, x, v * 2 + 1, m + 1, R);
mn[v] = mn[v * 2];
ct[v] = ct[v * 2];
if (mn[v * 2 + 1] < mn[v]) {
mn[v] = mn[v * 2 + 1];
ct[v] = 0;
}
if (mn[v * 2 + 1] == mn[v]) {
ct[v] += ct[v * 2 + 1];
}
}
}
pair<int, int> v[4];
void upd2times2(int a, int b, int d) {
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
v[i + i + j] = { a + i, b + j };
}
}
sort(v, v + 4, [&](pair<int, int> p, pair<int, int> q) {
return num[p.first][p.second] < num[q.first][q.second];
});
if (num[v[0].first][v[0].second] != INF)
upd(num[v[0].first][v[0].second], min(len - 1, num[v[1].first][v[1].second] - 1), d, 1, 0, len - 1);
if (num[v[2].first][v[2].second] != INF)
upd(num[v[2].first][v[2].second], min(len - 1, num[v[3].first][v[3].second] - 1), d * G, 1, 0, len - 1);
}
void change(int a, int b, int d) {
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
upd2times2(a - i, b - j, d);
}
}
}
// void que(int v, int L, int R) {
// push(v, L, R);
// if (L == R) {
// cout << t[v].mn << " ";
// }
// else {
// int m = (L + R) >> 1;
// que(v * 2, L, m);
// que(v * 2 + 1, m + 1, R);
// }
// }
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
n = H;
m = W;
x = R;
y = C;
len = n * m;
num.resize(n + 2, vector<int>(m + 2, INF));
fill(ct, ct + len * 4, 1);
for (int i = 0; i < len; i++) {
x[i]++;
y[i]++;
num[x[i]][y[i]] = i;
}
for (int i = 0; i <= n; i++) {
for (int j = 0; j <= m; j++) {
upd2times2(i, j, 1);
}
}
}
int swap_seats(int a, int b) {
change(x[a], y[a], -1);
num[x[a]][y[a]] = b;
change(x[a], y[a], 1);
change(x[b], y[b], -1);
num[x[b]][y[b]] = a;
change(x[b], y[b], 1);
swap(x[a], x[b]);
swap(y[a], y[b]);
push(1, 0, len - 1);
return mn[1] == 4 ? ct[1] : 0;
}
