#include "rect.h"
#include <bits/stdc++.h>
using namespace std;
#define sz(x) ((int)(x).size())
typedef long long ll;
vector<vector<int>> fen;
void add(bool b, int i, int x){
for(i++; i < sz(fen[0]); i+=i&-i) fen[b][i] += x;
}
int qry(bool b, int i){
int ans = 0;
for(i++; i > 0; i-=i&-i) ans += fen[b][i];
return ans;
}
int qry(bool b, int i, int j){
if(i > 0) return qry(b, j)-qry(b, i-1);
else return qry(b, j);
}
long long count_rectangles(vector<vector<int>> a) {
int n = sz(a), m = sz(a[0]);
vector<vector<short>> r1(n, vector<short>(m, -1)), r2(n, vector<short>(m, -1));
for(int i = 1; i < n-1; i++){
stack<pair<int, int>> st({{a[i][0], 0}});
for(int j = 1; j < m; j++){
while(!st.empty() && a[i][j] > st.top().first){
auto [h, k] = st.top();
st.pop();
r2[i][k] = j-1;
}
if(!st.empty()) {
if(st.top().first > a[i][j]) r1[i][j] = st.top().second+1;
else r1[i][j] = r1[i][st.top().second];
}
st.emplace(a[i][j], j);
}
}
vector<vector<short>> c1(n, vector<short>(m, -1)), c2(n, vector<short>(m, -1));
for(int j = 1; j < m-1; j++){
stack<pair<int, int>> st({{a[0][j], 0}});
for(int i = 1; i < n; i++){
while(!st.empty() && a[i][j] > st.top().first){
auto [h, k] = st.top(); st.pop();
c2[k][j] = i-1;
}
if(!st.empty()){
if(st.top().first > a[i][j]) c1[i][j] = st.top().second+1;
else c1[i][j] = c1[st.top().second][j];
}
st.emplace(a[i][j], i);
}
}
a.clear();
a.shrink_to_fit();
int mx = max(n, m);
fen.resize(2, vector<int>(mx+1));
vector<bool> valid;
vector<vector<tuple<bool, short, short, int>>> queries(mx*mx);
unordered_set<ll> noDupl;
int q = 0;
int ans = 0;
for(int i = 1; i < n-1; i++){
for(int j = 1; j < m-1; j++){
// cerr << "\n" << i << " " << j << " " << r1[i][j] << " " << r2[i][j] << " " << c1[i][j] << " " << c2[i][j] << "\n";
if(r1[i][j] != -1 && r2[i][j] != -1 && c1[i][j] != -1 && c2[i][j] != -1){
int x = c1[i][j]*mx + c2[i][j], y = r1[i][j]*mx + r2[i][j];
queries[x].emplace_back(0, j, 0, -1);
queries[y].emplace_back(1, i, 0, -1);
ll t = (ll)x*mx*mx+y;
if(noDupl.count(t)) continue;
noDupl.insert(t);
valid.push_back(true);
queries[x].emplace_back(0, r1[i][j], r2[i][j], q);
queries[y].emplace_back(1, c1[i][j], c2[i][j], q);
q++;
}
}
}
vector<vector<bool>> used(2, vector<bool>(mx));
for(int id = 1; id < mx*mx; id++){
for(auto [b, i, j, ind] : queries[id]){
if(ind == -1){
if(!used[b][i]) add(b, i, 1);
used[b][i] = true;
}
}
for(auto [b, i, j, ind] : queries[id]){
if(ind != -1){
if(qry(b, i, j) != j-i+1) valid[ind] = false;
}
}
for(auto [b, i, j, ind] : queries[id]){
if(ind == -1){
if(used[b][i]) add(b, i, -1);
used[b][i] = false;
}
}
}
for(bool b : valid) ans += b;
return ans;
}
