This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "rect.h"
#include <bits/stdc++.h>
#define FOR(i,p,k) for(int i=(p);i<=(k);++i)
#define REP(i,n) FOR(i,0,(n)-1)
#define ssize(x) (int((x).size()))
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
ll count_rectangles(vector<vector<int>> wej){
int n = ssize(wej);
int m = ssize(wej[0]);
if(n<3 || m<3) return 0ll;
vector poziomo(m, vector(m, vector<int>()));
FOR(i, 1, n-2){
vector<int> stos;
REP(j, m){
while(ssize(stos) && wej[i][stos.back()] <= wej[i][j]){
int t = stos.back();
if(t+1 <= j-1) poziomo[t+1][j-1].emplace_back(i);
stos.pop_back();
}
if(ssize(stos)){
int t = stos.back();
if(t+1 <= j-1) poziomo[t+1][j-1].emplace_back(i);
}
stos.emplace_back(j);
}
}
//~ vector pionowo(n, vector(n, vector<int>()));
vector pionowo(n, vector(m, vector<int>()));
FOR(i, 1, m-2){
vector<int> stos;
REP(j, n){
while(ssize(stos) && wej[stos.back()][i] <= wej[j][i]){
int t = stos.back();
if(t+1 <= j-1) pionowo[j-1][i].emplace_back(t+1);
stos.pop_back();
}
if(ssize(stos)){
int t = stos.back();
if(t+1 <= j-1) pionowo[j-1][i].emplace_back(t+1);
}
stos.emplace_back(j);
}
}
//~ REP(j, m) FOR(i, 0, j){
//~ printf("%d %d: ", i, j);
//~ for(int x : poziomo[i][j]) printf("%d ", x);
//~ printf("\n");
//~ }
//~ REP(j, n) FOR(i, 0, j){
//~ printf("%d %d: ", i, j);
//~ for(int x : pionowo[i][j]) printf("%d ", x);
//~ printf("\n");
//~ }
vector<int> jest(n, 0);
ll wyn = 0ll;
REP(j, m) FOR(i, 0, j){
int maks_gora = 0, pop = -1;
for(int dol : poziomo[i][j]){
if(dol != pop+1) maks_gora = dol;
pop = dol;
FOR(poz, i, j) for(int &x : pionowo[dol][poz]){
if(x < maks_gora) break;
if(++jest[x] == j-i+1) ++wyn;
}
FOR(poz, i, j) for(int &x : pionowo[dol][poz]){
if(x < maks_gora) break;
jest[x] = 0;
}
}
}
return wyn;
}
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