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C.cpp
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C.cpp
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#include<bits/stdc++.h>
using namespace std;
#define fastio ios::sync_with_stdio(0);cin.tie(0)
char ara[1005][1005];
long long vis[1000005];
vector<long long> adj[1000005];
map<pair<long long,long long>,long long> mp;
void DFS(long long v)
{
vis[v]=1;
for(long long i=0;i<adj[v].size();i++)
{
if(vis[adj[v][i]]==0){
//cout<<adj[v][i]<<"\n";
DFS(adj[v][i]);
}
}
}
int main()
{
fastio;
long long h,w,i,j,cnt=0,ans=0;
cin>>h>>w;
for(i=0;i<h;i++)
{
for(j=0;j<w;j++)
cin>>ara[i][j];
}
for(i=0;i<h;i++)
{
for(j=0;j<w;j++)
{
if(ara[i][j]=='#')
{
if(mp[{i,j}]==0)
{
mp[{i,j}]=cnt+1;
cnt++;
}
long long v=mp[{i,j}];
if(i>0)
{
if(j>0 && ara[i-1][j-1]=='#')
{
adj[v].push_back(mp[{i-1,j-1}]);
}
if(ara[i-1][j]=='#')
{
adj[v].push_back(mp[{i-1,j}]);
}
if(j<w-1 && ara[i-1][j+1]=='#')
{
adj[mp[{i,j}]].push_back(mp[{i-1,j+1}]);
}
}
if(j>0 && ara[i][j-1]=='#')
{
if(mp[{i,j-1}]==0)
{
mp[{i,j-1}]=cnt+1;
cnt++;
}
adj[v].push_back(mp[{i,j-1}]);
}
if(j<w-1 && ara[i][j+1]=='#')
{
if(mp[{i,j+1}]==0)
{
mp[{i,j+1}]=cnt+1;
cnt++;
}
adj[v].push_back(mp[{i,j+1}]);
}
if(i<h-1)
{
if(j>0 && ara[i+1][j-1]=='#')
{
if(mp[{i+1,j-1}]==0)
{
mp[{i+1,j-1}]=cnt+1;
cnt++;
}
adj[v].push_back(mp[{i+1,j-1}]);
}
if(ara[i+1][j]=='#')
{
if(mp[{i+1,j}]==0)
{
mp[{i+1,j}]=cnt+1;
cnt++;
}
adj[v].push_back(mp[{i+1,j}]);
}
if(j<w-1 && ara[i+1][j+1]=='#')
{
if(mp[{i+1,j+1}]==0)
{
mp[{i+1,j+1}]=cnt+1;
cnt++;
}
adj[v].push_back(mp[{i+1,j+1}]);
}
}
}
}
}
//cout<<cnt<<"\n";
for(i=1;i<=cnt;i++)
{
if(!vis[i])
{
//cout<<i<<"\n";
ans++;
DFS(i);
}
}
cout<<ans<<"\n";
return 0;
}