#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
#define X first
#define Y second
#define mp make_pair
#define pb push_back
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <int, pii> pip;
typedef pair <pii, int> ppi;
typedef pair <ll, ll> pll;
const int INF=0x3f3f3f3f;
const int N=1e6+5;
int n, r, c;
int sol=0;
pii p[N], maxi[N], mini[N];
int ok(int i) {
return (maxi[i].X-mini[i].X+1)*(maxi[i].Y-mini[i].Y+1)==i+1;
}
void upd(int i) {
maxi[i].X=mini[i].X=p[i].X;
maxi[i].Y=mini[i].Y=p[i].Y;
if (i) maxi[i].X=max(maxi[i-1].X, p[i].X), maxi[i].Y=max(maxi[i-1].Y, p[i].Y);
if (i) mini[i].X=min(mini[i-1].X, p[i].X), mini[i].Y=min(mini[i-1].Y, p[i].Y);
if (ok(i)) sol++;
}
void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
n=H*W; r=H; c=W;
for (int i=0; i<n; ++i) {
p[i]=mp(R[i], C[i]);
upd(i);
}
}
int swap_seats(int a, int b) {
if (a>b) swap(a, b);
for (int i=a; i<b; ++i) if (ok(i)) sol--;
swap(p[a], p[b]);
for (int i=a; i<b; ++i) upd(i);
return sol;
}
