>When no more interesting kata can be resolved, I just choose to create the new kata, to solve their own, to enjoy the process  --myjinxin2015 said

# Description:
 
 Give you two arrays `arr1` and `arr2`. They have the same length(length>=2). The elements of two arrays always be integer.
 
 Sort `arr1` according to the ascending order of arr2; Sort `arr2` according to the ascending order of arr1. Description is not easy to understand, for example:
 ```
 arr1=[5,4,3,2,1], 
 arr2=[6,5,7,8,9]
 ```
 Let us try to sorting arr1. 
 First, we need know the ascending order of arr2:
 ```
 [5,6,7,8,9]
 ```
 We can see, after sort arr2 to ascending order, some elements' index are changed:
 ```
 unsort arr2      ascending order arr2
 [6,5,7,8,9]--->      [5,6,7,8,9]
 
 index0(6)  --->      index1
 index1(5)  --->      index0
 index2(7)            index2(no change)
 index3(8)            index3(no change)
 index4(9)            index4(no change)
 ```
 So, wo need according to these changes to sorting arr1:
 ```
 unsort arr1          sorted arr1
 [5,4,3,2,1]--->      [4,5,3,2,1]
 
 index0(5)  --->      index1
 index1(4)  --->      index0
 index2(3)            index2(no change)
 index3(2)            index3(no change)
 index4(1)            index4(no change)
 
 So: sorted arr1= [4,5,3,2,1]
 ```
 And then, we sorting arr2 with the same process:
 ```
 unsort arr1      ascending order arr1
 [5,4,3,2,1]--->      [1,2,3,4,5]
 
 index0(5)  --->      index4
 index1(4)  --->      index3
 index2(3)            index2(no change)
 index3(2)  --->      index1
 index4(1)  --->      index0
 
 unsort arr2          sorted arr2
 [6,5,7,8,9]--->      [9,8,7,5,6]
 
 index0(6)  --->      index4
 index1(5)  --->      index3
 index2(7)            index2(no change)
 index3(8)  --->      index1
 index4(9)  --->      index0
 
 So: sorted arr2= [9,8,7,5,6]
 
 ```
 Finally, returns the sorted arrays by a 2D array: `[sorted arr1, sorted arr2]`
 
 Note: In ascending order sorting process(not the final sort), if some elements have same value, sort them according to their index; You can modify the original array, but I advise you not to do that. ;-)

```if:haskell
 Note: In Haskell, you are expected to return a tuple of arrays, and good luck trying to modifiy the original array. :]
```

# Some Examples and explain

```
sortArrays([5,4,3,2,1],[6,5,7,8,9]) should return
[[4,5,3,2,1],[9,8,7,5,6]]

sortArrays([2,1,3,4,5],[5,6,7,8,9]) should return
[[2,1,3,4,5],[6,5,7,8,9]]

sortArrays([5,6,9,2,6,5],[3,6,7,4,8,1]) should return
[[5,5,2,6,9,6],[4,3,1,6,8,7]]
```

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = "import numpy as np\n\ndef sort_two_arrays(arr1, arr2):\n    idx2 = np.argsort(arr2, kind='mergesort')\n    idx1 = np.argsort(arr1, kind='mergesort')\n    return [[arr1[i] for i in idx2], [arr2[i] for i in idx1]]"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'sort_two_arrays'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 13152