In this kata, the number 0 is infected. You are given a list. Every turn, any item in the list that is adjacent to a 0 becomes infected and transforms into a 0. How many turns will it take for the whole list to become infected?

```
[0,1,1,0] ==> [0,0,0,0] 
All infected in 1 turn.

[1,1,0,1,1] --> [1,0,0,0,1] --> [0,0,0,0,0]
All infected in 2 turns

[0,1,1,1] --> [0,0,1,1] --> [0,0,0,1] --> [0,0,0,0]
All infected in 3 turns.
```

All lists will contain at least one item, and at least one zero, and the only items will be 0s and 1s. Lists may be very very long, so pure brute force approach will not work.

```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 = 'from math import ceil\n\n\ndef infected_zeroes(lst):\n    # convert out list to a string for processing and split on "infected" zeroes\n    chunks_of_ones = \'\'.join([str(l) for l in lst]).split(\'0\')\n\n    longest_chunk_of_ones = max([len(c) for c in chunks_of_ones])\n\n    # if our longest run is the starting or ending chunk, num_turns is going to be the length of that chunk\n    # however, all other chunks will be getting infected from both sides, so in those cases we divide by two\n    num_turns = max(len(chunks_of_ones[0]), ceil(longest_chunk_of_ones / 2), len(chunks_of_ones[-1]))\n    \n    return num_turns'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'infected_zeroes'
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: 5790