Generate a random tree and print it like 'tree' format

print.tree.cpp

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

struct node{
    int id;
    vector<node*>children;
};

int create_tree(node * &root, int max_node){
    root->id = rand()%100;
    int result = 1;
    if (max_node <= 0) return result;
    
    int n = min(rand()%max_node, 4) + 1;
    for(int i = 0; i < n; i++){
        root->children.push_back(new node);
        max_node--;
    }
    for(auto &i : root->children){
        create_tree(i, max_node/n);
    }
}

#define LENPAD  3
void print(node * root, string padding, int flag = 0){
    string x;
    if (flag == 0){
        x = padding + string(LENPAD, ' ');
    } else if (flag == 2) {
        x = padding + string (LENPAD, '.'); 
    }  else if (flag == 1) {
        // padding.back() = '|';
        x = padding;
        x.back() = '|';
        x += string (LENPAD, '.'); 
    }
    cout << x 
        //  << (lvl ? "...." : "    ")
        << root->id << endl;
    for(auto x  = root->children.begin(); x != root->children.end(); x++){
        
        string npad = padding + "    ";
        int a;
        if ( x == root->children.end()- 1 ){
            npad += " " ;
            a = 1;
        }
        else {
            npad += "|";
            a = 2;
        }
        print(*x, npad, a);
    }
}

int main(){
    
    int n;
    cin >> n;

    node *root = new node;
    int i = create_tree(root, n);
    cout << n << endl;
    print(root, "");
}