#include "seats.h"
#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define all(x) x.begin(), x.end()
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
template<typename T>
using matrix = vector<vector<T>>;
vector<pii> v;
int resp = 0;
vector<pii> mini, maxi;
vector<int> isgood;
int n;
void calc(int id, pii nmin, pii nmax){
resp-=isgood[id];
isgood[id] = (nmax.ff-nmin.ff+1)*(nmax.ss-nmin.ss+1) == id+1;
resp+=isgood[id];
mini[id] = nmin;
maxi[id] = nmax;
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
n = H*W;
v = vector<pii>(n);
mini = vector<pii>(n);
maxi = vector<pii>(n);
isgood = vector<int>(n);
for(int i = 0; i < n; i++){
v[i] = {R[i], C[i]};
}
calc(0,v[0],v[0]);
for(int i = 1; i < n; i++){
pii nmin = mini[i-1], nmax = maxi[i-1];
nmin.ff = min(nmin.ff,v[i].ff);
nmin.ss = min(nmin.ss,v[i].ss);
nmax.ff = max(nmax.ff,v[i].ff);
nmax.ss = max(nmax.ss,v[i].ss);
calc(i,nmin,nmax);
}
}
int swap_seats(int a, int b) {
if(a > b)
swap(a,b);
swap(v[a],v[b]);
if(a == 0){
mini[a] = v[a];
maxi[a] = v[a];
a++;
}
for(int i = a; i <= b; i++){
pii nmin = mini[i-1], nmax = maxi[i-1];
nmin.ff = min(nmin.ff,v[i].ff);
nmin.ss = min(nmin.ss,v[i].ss);
nmax.ff = max(nmax.ff,v[i].ff);
nmax.ss = max(nmax.ss,v[i].ss);
calc(i,nmin,nmax);
}
return resp;
}
