connected components

unordered_map<int,vector<int>> adj;
vector<int> vis;

void dfs(int root){
vis[root] = 1;
    for(int v : adj[root]){
        if(vis[v] == 0)dfs(v);
    }

}

int main(){
    int cnt =0;
    for(int node = 0;node < n; node++){
        if(vis[node] == 0){
        dfs(node);
            cnt++;
        }
    }

    cout << "Connected components : " << cnt ;
    return 0;
}