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 <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <array>
using namespace std;
typedef long long ll;
const int maxn=2503, Log=12, pot=(1<<Log);
const int inf=1e9;
ll sol;
int svi[maxn][maxn][4];
int n, m;
map < ll, bool > bio;
int svi1[maxn][maxn][4];
struct tmin{
int t[pot*2];
void update(int x, int val){
t[x]=val;
}
void gradi(){
for(int x=pot-1; x>0; x--){
t[x]=min(t[x*2], t[x*2+1]);
}
}
int query(int l, int r){
int sol=inf;
for(l+=pot, r+=pot; l<r; l>>=1, r>>=1){
if(l&1){
sol=min(sol, t[l++]);
}
if(r&1){
sol=min(sol, t[--r]);
}
}
return sol;
}
};
struct tmax{
int t[pot*2];
void update(int x, int val){
t[x]=val;
}
void gradi(){
for(int x=pot-1; x>0; x--){
t[x]=max(t[x*2], t[x*2+1]);
}
}
int query(int l, int r){
int sol=0;
for(l+=pot, r+=pot; l<r; l>>=1, r>>=1){
if(l&1){
sol=max(sol, t[l++]);
}
if(r&1){
sol=max(sol, t[--r]);
}
}
return sol;
}
};
tmin R1[maxn], C1[maxn];
tmax R2[maxn], C2[maxn];
ll count_rectangles(vector < vector < int > > a){
n=a.size();
m=a[0].size();
vector < pair <int, int > > v;
for(int i=0; i<n; i++){
for(int j=0; j<m; j++){
while(!v.empty() && v.back().first<a[i][j]){
v.pop_back();
}
if(v.empty()){
svi1[i][j][2]=0;
}
else{
svi1[i][j][2]=v.back().second+1;
}
while(!v.empty() && v.back().first<=a[i][j]){
v.pop_back();
}
if(v.empty()){
svi[i][j][2]=0;
}
else{
svi[i][j][2]=v.back().second+1;
}
v.push_back({a[i][j], j});
}
v.clear();
for(int j=m-1; j>-1; j--){
while(!v.empty() && v.back().first<a[i][j]){
v.pop_back();
}
if(v.empty()){
svi1[i][j][3]=m-1;
}
else{
svi1[i][j][3]=v.back().second-1;
}
while(!v.empty() && v.back().first<=a[i][j]){
v.pop_back();
}
if(v.empty()){
svi[i][j][3]=m-1;
}
else{
svi[i][j][3]=v.back().second-1;
}
v.push_back({a[i][j], j});
}
v.clear();
}
for(int j=0; j<m; j++){
for(int i=0; i<n; i++){
while(!v.empty() && v.back().first<a[i][j]){
v.pop_back();
}
if(v.empty()){
svi1[i][j][0]=0;
}
else{
svi1[i][j][0]=v.back().second+1;
}
while(!v.empty() && v.back().first<=a[i][j]){
v.pop_back();
}
if(v.empty()){
svi[i][j][0]=0;
}
else{
svi[i][j][0]=v.back().second+1;
}
v.push_back({a[i][j], i});
}
v.clear();
for(int i=n-1; i>-1; i--){
while(!v.empty() && v.back().first<a[i][j]){
v.pop_back();
}
if(v.empty()){
svi1[i][j][1]=n-1;
}
else{
svi1[i][j][1]=v.back().second-1;
}
while(!v.empty() && v.back().first<=a[i][j]){
v.pop_back();
}
if(v.empty()){
svi[i][j][1]=n-1;
}
else{
svi[i][j][1]=v.back().second-1;
}
v.push_back({a[i][j], i});
}
v.clear();
}
for(int i=0; i<n; i++){
for(int j=0; j<m; j++){
R1[i].update(j+pot, svi1[i][j][1]);
R2[i].update(j+pot, svi1[i][j][0]);
C1[j].update(i+pot, svi1[i][j][3]);
C2[j].update(i+pot, svi1[i][j][2]);
}
}
for(int i=0; i<n; i++){
R1[i].gradi();
R2[i].gradi();
}
for(int i=0; i<m; i++){
C1[i].gradi();
C2[i].gradi();
}
int c[4];
ll br;
for(int i=1; i<n-1; i++){
for(int j=1; j<m-1; j++){
br=0;
for(int k=0; k<4; k++){
c[k]=svi[i][j][k];
br*=maxn;
br+=c[k];
}
if(c[0]==0 || c[2]==0 || c[1]==n-1 || c[3]==m-1 || bio.find(br)!=bio.end()){
continue;
}
if(c[0]<R2[c[1]+1].query(c[2], c[3]+1)){
continue;
}
if(c[1]>R1[c[0]-1].query(c[2], c[3]+1)){
continue;
}
if(c[2]<C2[c[3]+1].query(c[0], c[1]+1)){
continue;
}
if(c[3]>C1[c[2]-1].query(c[0], c[1]+1)){
continue;
}
bio[br]=1;
// cout << c[0] << ' '<< c[2] << ' ' << c[1] << ' ' << c[3] << endl;
sol++;
}
}
return sol;
}
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