lhl2617

// NB written for Linux g++, replace the #include with indiv. headers if required. 
// C++11 used.

#include <bits/stdc++.h>

using namespace std;

#define LOG_DEBUG 0 // enable debug

#define debug if (!LOG_DEBUG) {} else cerr

lhl2617

// by lhreeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee (I don't remember how many e's)
// NOTE I might've edited sections for correctness/improvements/issues!

/*
    Please first copy & paste the contents, starting from line 5, from
    https://github.com/scijs/ode-rk4/blob/master/lib/index.js
    
    
    <for the motivated>
    ...alternatively you can use the npm package and install `ode-rk4` and use