#include "seats.h"
#include "bits/stdc++.h"
using namespace std;
int n, m;
vector<vector<int>> a;
int ans;
vector<int> s;
vector<int> r, c;
vector<int> mxR, mnR, mxC, mnC;
void edit (int ll, int rr) {
if (ll == 0) {
mxR[0] = mnR[0] = r[0];
mxC[0] = mnC[0] = c[0];
ll = 1;
}
for (int i = ll; i <= rr; ++i) {
if (s[i]) {
s[i] = 0;
ans--;
}
mxR[i] = max(mxR[i - 1], r[i]);
mxC[i] = max(mxC[i - 1], c[i]);
mnR[i] = min(mnR[i - 1], r[i]);
mnC[i] = min(mnC[i - 1], c[i]);
if ((mxR[i] - mnR[i] + 1) * (mxC[i] - mnC[i] + 1) == i + 1) {
s[i] = 1;
ans++;
}
}
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
n = H, m = W;
r = R; c = C;
a.resize(n);
s.resize(n * m);
mxR.resize(n * m);
mxC.resize(n * m);
mnR.resize(n * m);
mnC.resize(n * m);
for (int i = 0; i < n; ++i) {
a[i].resize(m);
}
for (int i = 0; i < n * m; ++i) {
a[r[i]][c[i]] = i;
}
s[0] = 1;
mxR[0] = mnR[0] = r[0];
mxC[0] = mnC[0] = c[0];
edit(0, n * m - 1);
}
int swap_seats(int x, int y) {
swap(c[x], c[y]);
swap(r[x], r[y]);
edit(x, y);
return ans + 1;
}
