maxdepth

#include<bits/stdc++.h>
using namespace std;


// You should only implement the function given below

class node{
public:
    int val;
    node* left;
    node* right;

    node(int val):val(val),left(nullptr),right(nullptr){}
};

int solution(node* root){
            // write your code here
}


int main(){
        int n; cin >> n;
        vector<node*> vec(n+1);
        int root; cin >> root;
        for(int i = 1; i <= n; i++){
            vec[i] = new node(i);
        }
        for(int i = 1; i <= n; i++){
            int x,y; cin >> x >> y;
            if(x != -1){
                vec[i] -> left = vec[x];
            }if(y != -1){
                vec[i] -> right = vec[y];
            }
        }
        cout << solution(vec[root]) << endl;
}