#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long unsigned long ull;
typedef double long ld;
int h, w, r[1000005], c[1000005];
pair<int, int> pref_mx[1000005], pref_mn[1000005];
int small_change = 0;
void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
h = H; w = W;
for (int i = 0; i < h * w; i++) r[i] = R[i];
for (int i = 0; i < h * w; i++) c[i] = C[i];
pref_mx[0] = pref_mn[0] = {r[0], c[0]};
for (int i = 1; i < h * w; i++) {
pref_mx[i].first = max(pref_mx[i - 1].first, r[i]);
pref_mx[i].second = max(pref_mx[i - 1].second, c[i]);
pref_mn[i].first = min(pref_mn[i - 1].first, r[i]);
pref_mn[i].second = min(pref_mn[i - 1].second, c[i]);
}
for (int i = 0; i < h * w; i++) {
if ((pref_mx[i].first - pref_mn[i].first + 1) * (pref_mx[i].second - pref_mn[i].second + 1) == i + 1) {
small_change++;
}
}
}
int swap_seats(int a, int b) {
if (h * w <= 10000) {
int ans = 0;
pair<int, int> mn, mx;
mx = mn = {r[0], c[0]};
for (int i = 0; i < h * w; i++) {
mx.first = max(mx.first, r[i]);
mx.second = max(mx.second, c[i]);
mn.first = min(mn.first, r[i]);
mn.second = min(mn.second, c[i]);
if ((mx.first - mn.first + 1) * (mx.second - mn.second + 1) == i + 1) {
ans++;
}
}
return ans;
}
if (abs(a - b) <= 10000) {
if (a > b) swap(a, b);
for (int i = a; i <= b; i++) {
if ((pref_mx[i].first - pref_mn[i].first + 1) * (pref_mx[i].second - pref_mn[i].second + 1) == i + 1) {
small_change--;
}
}
swap(r[a], r[b]);
swap(c[a], c[b]);
for (int i = a; i <= b; i++) {
if (i == 0) pref_mx[i] = pref_mn[i] = {r[i], c[i]};
else {
pref_mx[i].first = max(pref_mx[i - 1].first, r[i]);
pref_mx[i].second = max(pref_mx[i - 1].second, c[i]);
pref_mn[i].first = min(pref_mn[i - 1].first, r[i]);
pref_mn[i].second = min(pref_mn[i - 1].second, c[i]);
}
}
for (int i = a; i <= b; i++) {
if ((pref_mx[i].first - pref_mn[i].first + 1) * (pref_mx[i].second - pref_mn[i].second + 1) == i + 1) {
small_change++;
}
}
}
return 0;
}
