hoc sinh xuan dinh k64 co dam me voi tin hoc

.

include <iostream>

bool check(char arr[1001][1001],int i,int j);
int main(){
int n,m;
std::cin>>n>>m;
char arr[1001][1001];
for(int i=0; i<n; i++){ for(int j=0; j\<m; j++){ std::cin>>arr[i][j];
}
}
int rooms=0;
for(int i=0; i<n; i++){
for(int j=0; j<m; j++){
if(arr[i][j]=='.'){
if(check(arr, i, j)){
rooms++;
}
arr[i][j] = '1';
}
}
}
std::cout << rooms;
}
bool check(char arr[1001][1001],int i,int j){
if(arr[i-1][j]=='1'||arr[i+1][j]=='1'||arr[i][j-1]=='1'||arr[i][j+1]=='1'||arr[i-1][j-1]=='1'||arr[i+1][j+1]=='1'||arr[i-1][j+1]=='1'||arr[i+1][j-1]=='1'){
return false;
}else return true;
}

include<bits/stdc++.h>

using namespace std;
int main()
{
int n;
set<int> se;
while(cin >>n)
{
se.insert(n);
}
cout <<se.size();
}

là lá lá la la là