#include <bits/stdc++.h>
#include "seats.h"
#define FOR(i,n) for(int i=0;i<n;i++)
#define FORE(i,a,b) for(int i = a;i<=b;i++)
#define ll long long int
#define pb push_back
#define vi vector<int>
#define ff first
#define ss second
#define ii pair<int,int>
#define il pair<int,ll>
using namespace std;
const int MAXN = 10000;
vi grid[MAXN];
ii id[MAXN];
int h;int w;
int l[MAXN];
int r[MAXN];
int u[MAXN];
int d[MAXN];
bool ok[MAXN];
int cnt = 0;
void update(int a,int b){
swap(id[a],id[b]);
FORE(i,a,b){
if(i == 0){
l[i] = r[i] = id[i].ss;
u[i] = d[i] = id[i].ff;
}else{
l[i] = min(l[i-1],id[i].ss);
r[i] = max(r[i-1],id[i].ss);
u[i] = min(l[i-1],id[i].ff);
d[i] = max(r[i-1],id[i].ff);
}
cnt -= ok[i];
ok[i] = (r-l+1)*(d-u+1) == i+1;
cnt += ok[i];
}
}
void give_initial_chart(int h,int w,vi r,vi c){
::h = h;::w = w;
FOR(i,h*w){
id[i] = {r[i],c[i]};
}
}
int swap_seats(int a,int b){
update(a,b);
return cnt;
}
