#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;
const int MAXN = 1e6+5;
int h, w, n;
pii points[MAXN];
set<int> occ[2][1000];
void make_occ(int i) {
occ[0][points[i].first].insert(i);
occ[1][points[i].second].insert(i);
}
void un_make(int i) {
occ[0][points[i].first].erase(i);
occ[1][points[i].second].erase(i);
}
void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
h = H;
w = W;
n = h*w;
for (int i = 0; i < n; i++) {
points[i] = pii(R[i], C[i]);
make_occ(i);
}
}
int swap_seats(int a, int b) {
un_make(a);
un_make(b);
swap(points[a], points[b]);
make_occ(a);
make_occ(b);
set<int> relevant;
for (int i = 0; i < h; i++) relevant.insert(*occ[0][i].begin());
for (int i = 0; i < w; i++) relevant.insert(*occ[1][i].begin());
int l = h, r = 0, u = w, d = 0;
int ans = 1;
for (int v: relevant) {
ans += ((r-l+1)*(d-u+1) == v);
l = min(l, points[v].first);
r = max(r, points[v].first);
u = min(u, points[v].second);
d = max(d, points[v].second);
}
return ans;
}
