#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e6 + 10;
vector<int> l1(maxn, maxn), l2(maxn, -maxn), c1(maxn, maxn), c2(maxn, -maxn), marc(maxn);
vector<int> i, j;
int resp;
void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
i = R; j = C;
for( int k = 1; k <= H*W; k++ ){
l1[k] = min(l1[k - 1], i[k - 1] );
l2[k] = max(l2[k - 1], i[k - 1] );
c1[k] = min(c1[k - 1], j[k - 1] );
c2[k] = max(c2[k - 1], j[k - 1] );
if( (l2[k] - l1[k] + 1)*(c2[k] - c1[k] + 1) == k ){ marc[k] = 1; resp++; }
}
}
int swap_seats(int a, int b) {
swap( i[a], i[b] ); swap( j[a], j[b] );
for( int k = a + 1; k <= b + 1; k++ ){
if( marc[k] ){ marc[k] = 0; resp--; }
l1[k] = min(l1[k - 1], i[k - 1] );
l2[k] = max(l2[k - 1], i[k - 1] );
c1[k] = min(c1[k - 1], j[k - 1] );
c2[k] = max(c2[k - 1], j[k - 1] );
if( (l2[k] - l1[k] + 1)*(c2[k] - c1[k] + 1) == k ){ marc[k] = 1; resp++; }
}
return resp;
}
