#include "rect.h"
#include <iostream>
using namespace std;
const int N = 25e2;
const int inf = N + 1;
int nxt[4][N][N];
int prv[N][N];
int na[N][N];
int v2[N], cnt = 0;
int n, m;
pair<int,int> rot(int x, int y, int deg, int n2 = n,int m2 = m){
for(int i = 0;i < deg;i++){
swap(x,y);
y = n2 - 1 - y;
swap(n2,m2);
}
return {x,y};
}
bool check(int x, int y, int x2, int y2){
if(x == 0 || y == 0 || x2 == n - 1 || y2 == m - 1)return 0;
for(int i = y;i <= y2;i++){
pair<int,int> f = rot(x - 1, i, 3);
pair<int,int> f2 = rot(x2 + 1, i, 1);
if(rot(0, nxt[3][f.first][f.second], 1, m, n).first <= x2)return 0;
if(rot(0, nxt[1][f2.first][f2.second], 3, m, n).first >= x)return 0;
}
for(int i = x;i <= x2;i++){
pair<int,int> f = rot(i,y - 1,0);
pair<int,int> f2 = rot(i,y2 + 1,2);
if(nxt[0][f.first][f.second] <= y2)return 0;
if(rot(0,nxt[2][f2.first][f2.second],2).second >= y)return 0;
}
return 1;
}
long long count_rectangles(std::vector<std::vector<int>> a) {
n = a.size();
m = a[0].size();
int n2 = n;
int m2 = m;
for(int deg = 0;deg < 4;deg++){
for(int i = 0;i < n;i++){
for(int j = 0;j < m;j++){
pair <int,int> f = rot(i, j, deg);
na[f.first][f.second] = a[i][j];
nxt[deg][i][j] = inf;
}
}
for(int i = 0;i < n2;i++){
cnt = 0;
for(int j = 0;j < m2;j++){
int nr = na[i][j];
while(cnt > 0 && na[i][v2[cnt - 1]] <= na[i][j]){
nxt[deg][i][v2[cnt - 1]] = j;
cnt--;
}
v2[cnt++] = j;
}
}
swap(n2,m2);
}
int ans = 0;
//check(2,3,2,3);
for(int i = 0;i < n;i++){
for(int j = 0;j < m;j++){
for(int k = i;k < n;k++){
for(int p = j;p < m;p++){
if(check(i,j,k,p)){
ans++;
//cout<<i<<' '<<j<<' '<<k<<' '<<p<<'\n';
}
}
}
}
}
return ans;
}
/**
6 5
4 8 7 5 6
7 4 10 3 5
9 7 20 14 2
9 14 7 3 6
5 7 5 2 7
4 5 13 5 6
**/
