#include "seats.h"
#include<bits/stdc++.h>
using namespace std;
#define in insert
#define all(x) x.begin(),x.end()
#define pb push_back
#define eb emplace_back
#define ff first
#define ss second
#define x first
#define y second
const int mxn = 1e6 + 10;
int n, m, k, ans;
int dp[mxn];
pair<int, int> p[mxn];
pair<pair<int, int>, pair<int, int>> rec[mxn];
void mnn(int &x, int y) {
if(x > y) x = y;
}
void mxx(int &x, int y) {
if(x < y) x = y;
}
void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
n = H;
m = W;
k = R.size();
for(int i = 0; i < k; i++) {
p[i + 1] = {R[i], C[i]};
}
rec[0] = {{1e9, 1e9}, {-1e9, -1e9}};
for(int i = 1; i <= k; i++) {
rec[i] = rec[i - 1];
mnn(rec[i].ff.x, p[i].x);
mnn(rec[i].ff.y, p[i].y);
mxx(rec[i].ss.x, p[i].x);
mxx(rec[i].ss.y, p[i].y);
if((rec[i].ss.x - rec[i].ff.x + 1) * (rec[i].ss.y - rec[i].ff.y + 1) == i) ans++, dp[i] = 1;
}
}
int swap_seats(int a, int b) {
a++;
b++;
if(a > b) swap(a, b);
swap(p[a], p[b]);
for(int i = a; i <= b; i++) {
ans -= dp[i];
dp[i] = 0;
rec[i] = rec[i - 1];
mnn(rec[i].ff.x, p[i].x);
mnn(rec[i].ff.y, p[i].y);
mxx(rec[i].ss.x, p[i].x);
mxx(rec[i].ss.y, p[i].y);
if((rec[i].ss.x - rec[i].ff.x + 1) * (rec[i].ss.y - rec[i].ff.y + 1) == i) ans++, dp[i] = 1;
}
return ans;
}
