#include "seats.h"
#include <iostream>
using namespace std;
const int MX = 1e6+5;
vector<pair<int,int>> pos(MX);
int n = 0;
vector<int> rmin(MX,0);
vector<int> rmax(MX,0);
vector<int> cmin(MX,0);
vector<int> cmax(MX,0);
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
n = H*W;
for(int i=0;i<H*W;i++)pos[i] = {R[i],C[i]};
}
int swap_seats(int a, int b) {
swap(pos[a],pos[b]);
rmin[0]=rmax[0]=pos[0].first;
cmin[0]=cmax[0]=pos[0].second;
for(int i=1;i<n;i++){
rmin[i] = min(rmin[i-1],pos[i].first);
rmax[i] = max(rmax[i-1],pos[i].first);
cmin[i] = min(cmin[i-1],pos[i].second);
cmax[i] = max(cmax[i-1],pos[i].second);
}
// cout << endl;
long long ans = 0;
for(int i=0;i<n;i++){
int box_size = (rmax[i]-rmin[i]+1)*(cmax[i]-cmin[i]+1);
// cout << "{" << rmin[i] << "," << rmax[i] << "} {" << cmin[i] << "," << cmax[i] << "} " << box_size << " " << i+1 << endl;
if(i+1 == box_size){
ans++;
}
}
// cout << " ans = " << ans << endl << endl;
return ans;
}
