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"""
Make sure you have graphviz and pygraphviz installed.
By default this draws undirected graphs.

Draw directed graphs like below.
python3 gen_graph.py --directed

Input format:
- First line consists of 2 integers, number of nodes (n), number of edges (m)
- Next m lines contains

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### Five rarely used HTML tags


<abbr title="Computer Science">CS</abbr>

<bdo dir="rtl">Appaji</bdo>

<kbd>Ctrl</kbd>

<!-- System Output Font -->

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#include <bits/stdc++.h>

using namespace std;

struct Node {
    int val;
    shared_ptr<Node> next;
    Node(int _val) {
        val = _val;
        next = nullptr;

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#include <iostream>

template <typename T>
class Comparator {
    bool result;
    T last;

public:
    Comparator(bool _result, T _last) : result(_result), last(_last) {}
    operator bool() const {

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

/*
Memory is managed by Smart Pointers, So, Explicit delete is not necessary.
Hence, No memory leak. Check solve() for usage.
*/

struct NodeC {
    shared_ptr<NodeC> left, right;