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 "grader.cpp"
#include "rect.h"
#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
int n,m;
const int N=2500;
int a[N][N],l[N][N],r[N][N];
int mx[N];
int L[N],R[N];
int x[N],y[N];
ll count_rectangles(vector<vector<int> > vv) {
n=vv.size(),m=vv[0].size();
for (int i=1;i<=n;i++){
for (int j=1;j<=m;j++){
a[i][j]=vv[i-1][j-1];
}
}
for (int i=1;i<=n;i++){
for (int j=1;j<=m;j++){
l[i][j]=0;
for (int t=j-1;t>=1;t=l[i][t]){
if (a[i][t]>=a[i][j]){
l[i][j]=t;
break;
}
}
}
for (int j=m;j>=1;j--){
r[i][j]=m+1;
for (int t=j+1;t<=m;t=r[i][t]){
if (a[i][t]>=a[i][j]){
r[i][j]=t;
break;
}
}
}
}
ll res=0ll;
for (int i=1;i<=n;i++){
for (int j=1;j<=m;j++) mx[j]=0,L[j]=1,R[j]=m;
for (int j=i+2;j<=n;j++){
for (int t=1;t<=m;t++) {
mx[t]=max(mx[t],a[j-1][t]);
L[t]=max(L[t],l[j-1][t]);
R[t]=min(R[t],r[j-1][t]);
}
vector<int>bad;
bad.push_back(0);
for (int t=1;t<=m;t++){
if (mx[t]>=min(a[i][t],a[j][t])) bad.push_back(t);
}
bad.push_back(m+1);
for (int t=1;t<bad.size();t++){
for (int k=bad[t-1];k<bad[t];k++){
y[k]=min(R[k],bad[t]);
}
for (int k=bad[t-1]+1;k<=bad[t];k++){
x[k]=max(L[k],bad[t-1]);
}
}
for (int t=1;t<=m;t++){
if (x[y[t]]<=t) res++;
for (int k=t+2;k<y[t];k++){
if (t>=x[k]) res++;
}
}
}
}
return res;
}
Compilation message (stderr)
rect.cpp: In function 'll count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:54:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
54 | for (int t=1;t<bad.size();t++){
| ~^~~~~~~~~~~
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