#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 1e6 + 3;
int m,n,ans[N];
vector<int> x,y,mnx(N),mxx(N),mny(N),mxy(N);
int fw[N+1];
void update(int idx,int val){ idx++; while(idx<N) fw[idx]+=val,idx+=(idx & -idx); }
int read(int idx){ idx++; int val = 0; while(idx>0) val+=fw[idx],idx-=(idx & -idx); return val; }
void give_initial_chart(int H, int W,vector<int> R,vector<int> C)
{
m = H,n = W,x = R,y = C;
for(int i = 0;i < m*n;i++)
{
if(!i) mnx[i] = mxx[i] = x[i],mny[i] = mxy[i] = y[i];
else mnx[i] = min(mnx[i-1],x[i]),mxx[i] = max(mxx[i-1],x[i]),mny[i] = min(mny[i-1],y[i]),mxy[i] = max(mxy[i-1],y[i]);
if((mxx[i]-mnx[i]+1)*(mxy[i]-mny[i]+1)==i+1) update(i,1);
}
}
int swap_seats(int a,int b)
{
swap(x[a],x[b]),swap(y[a],y[b]);
for(int i = min(a,b);i <= max(a,b);i++)
{
if(read(i)-read(i-1)) update(i,-1);
if(!i) mnx[i] = mxx[i] = x[i],mny[i] = mxy[i] = y[i];
else mnx[i] = min(mnx[i-1],x[i]),mxx[i] = max(mxx[i-1],x[i]),mny[i] = min(mny[i-1],y[i]),mxy[i] = max(mxy[i-1],y[i]);
if((mxx[i]-mnx[i]+1)*(mxy[i]-mny[i]+1)==i+1) update(i,1);
}
return read(m*n-1);
}
