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set<int> cat; // store info about the cat 
vector<vector<int>>v; // graph
int ans = 0; // final answer 
vector<int>visited; // keep track of visited nodes , have size (n)
void dfs(int start /*current node */,int anc /* ancestor */ ,int m /*total cats*/ ,int counter =0 /* cats on path*/){
    if(cat.find(start)!=cat.end()){ 
        counter++;
    }else{
        counter=0;
    }
    if(counter==m+1){ // condition failed 
        return;
    }
    bool o=true; // will be true if leaf node 
    for(auto itr:v[start]){
        if(itr!=anc){
            o=false;
            dfs(itr,start , m , counter);
        }
    }
    if(o){
        ans++;
    }
    return ;
}
 
 

prog.cpp:1:1: error: no template named 'set'
set<int> cat; // store info about the cat 
^
prog.cpp:2:1: error: no template named 'vector'
vector<vector<int>>v; // graph
^
prog.cpp:2:8: error: use of undeclared identifier 'vector'
vector<vector<int>>v; // graph
       ^
prog.cpp:2:18: error: expected '(' for function-style cast or type construction
vector<vector<int>>v; // graph
              ~~~^
prog.cpp:4:1: error: no template named 'vector'
vector<int>visited; // keep track of visited nodes , have size (n)
^
prog.cpp:15:18: error: use of undeclared identifier 'v'
    for(auto itr:v[start]){
                 ^
6 errors generated.

Standard output is empty