# include <bits/stdc++.h>
# include "seats.h"
using namespace std;
const int N = 1e6 + 2;
int t[4][N * 4], ans;
vector <int> R, C;
void upd(int pos, int v = 1, int tl = 1, int tr = R.size()){
if(tl == tr){
t[0][v] = R[tl - 1];
t[1][v] = C[tl - 1];
t[2][v] = R[tl - 1];
t[3][v] = C[tl - 1];
} else {
int tm = (tl + tr) >> 1;
if(pos <= tm)
upd(pos, v << 1, tl, tm);
else
upd(pos, v << 1 | 1, tm + 1, tr);
t[0][v] = max(t[0][v << 1], t[0][v << 1 | 1]);
t[1][v] = max(t[1][v << 1], t[1][v << 1 | 1]);
t[2][v] = min(t[2][v << 1], t[2][v << 1 | 1]);
t[3][v] = min(t[3][v << 1], t[3][v << 1 | 1]);
}
}
int get(int l, int r, int tp, int v = 1, int tl = 1, int tr = R.size()){
if(l > tr || tl > r){
if(tp <= 1)
return 0;
else
return 1e9;
}
if(l <= tl && tr <= r)
return t[tp][v];
int tm = (tl + tr) >> 1;
if(tp <= 1)
return max(get(l, r, tp, v << 1, tl, tm),
get(l, r, tp, v << 1 | 1, tm + 1, tr));
else
return min(get(l, r, tp, v << 1, tl, tm),
get(l, r, tp, v << 1 | 1, tm + 1, tr));
}
int check(int x){
int ret = (get(1, x, 0) - get(1, x, 2) + 1) * (get(1, x, 1) - get(1, x, 3) + 1);
return ret;
}
void give_initial_chart(int H, int W, vector<int> r, vector<int> c) {
R = r, C = c;
for(int i = 0; i < R.size(); i ++){
upd(i + 1);
}
}
int swap_seats(int a, int b) {
if(a > b)
swap(a, b);
swap(R[a], R[b]);
swap(C[a], C[b]);
upd(a + 1);
upd(b + 1);
int ans = 1, cur = 1;
while(cur < R.size()){
int ret = check(cur + 1);
if(ret == cur + 1){
cur ++, ans ++;
} else {
cur = ret - 1;
}
}
return ans;
}
