#include <bits/stdc++.h>
#include "rect.h"
using namespace std;
#define flash ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define debug(x) cerr << " - " << #x << ": " << x << endl;
#define debugs(x, y) cerr << " - " << #x << ": " << x << " " << #y << ": " << y << endl;
#define all(x) (x).begin(),(x).end()
#define sz(x) (ll)x.size()
#define ll long long
#define INF 1000000000
#define pb push_back
struct greateri
{
template<class T>
bool operator()(T const &a, T const &b) const { return a > b; }
};
ll floodfill[2500][2500];
ll topx,topy,botx,boty;
ll last;
ll n,m;
ll dir[4][2]={{0,1},{1,0},{-1,0},{0,-1}};
void dfs(ll x,ll y)
{
topx=max(topx,x),topy=max(topy,y),botx=min(botx,x),boty=min(boty,y);
floodfill[x][y]=last;
for (ll i = 0; i < 4; ++i)
{
ll nextx=x+dir[i][0],nexty=y+dir[i][1];
if(floodfill[nextx][nexty]==0)
dfs(nextx,nexty);
}
}
ll count_rectangles(ll X[][2501])
{
//flash;
n = sizeof X / sizeof X[0]; // 2 rows
m = sizeof X[0] / sizeof(int);
for (ll i = 0; i < n; ++i)
{
for (ll j = 0; j < m; ++j)
{
if(i==0 || j==0 || i==n-1 || j==m-1)floodfill[i][j]=1;
}
}
last=1;
ll ans=0;
for (ll i = 1; i < n-1; ++i)
{
for (ll j = 1; j < m-1; ++j)
{
if(floodfill[i][j]==0)
{
last++;
topy=boty=j,topx=botx=i;
dfs(i,j);
ll topi = floodfill[topx][topy];
ll yopi = floodfill[topx][boty];
ll dopi = floodfill[botx][boty];
ll kopo = floodfill[botx][topy];
if(topi==yopi && yopi==dopi && dopi==kopo)ans++;
}
}
}
return ans;
}
//code the AC sol !
// BS/queue/map
Compilation message
rect.cpp: In function 'long long int count_rectangles(long long int (*)[2501])':
rect.cpp:36:15: warning: 'sizeof' on array function parameter 'X' will return size of 'long long int (*)[2501]' [-Wsizeof-array-argument]
n = sizeof X / sizeof X[0]; // 2 rows
^
rect.cpp:33:32: note: declared here
ll count_rectangles(ll X[][2501])
^
/tmp/ccuCxbE7.o: In function `main':
grader.cpp:(.text.startup+0x89e): undefined reference to `count_rectangles(std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > >)'
collect2: error: ld returned 1 exit status
