Given a string text, we are allowed to swap two of the characters in the string. Find the length of the longest substring with repeated characters.
 
Example 1:
Input: text = "ababa"
Output: 3
Explanation: We can swap the first 'b' with the last 'a', or the last 'b' with the first 'a'. Then, the longest repeated character substring is "aaa", which its length is 3.

Example 2:
Input: text = "aaabaaa"
Output: 6
Explanation: Swap 'b' with the last 'a' (or the first 'a'), and we get longest repeated character substring "aaaaaa", which its length is 6.

Example 3:
Input: text = "aaabbaaa"
Output: 4

Example 4:
Input: text = "aaaaa"
Output: 5
Explanation: No need to swap, longest repeated character substring is "aaaaa", length is 5.

Example 5:
Input: text = "abcdef"
Output: 1

 
Constraints:

1 <= text.length <= 20000
text consist of lowercase English characters only.

```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 = 'class Solution:\n    def maxRepOpt1(self, text: str) -> int:\n        # Group letters by occurence\n        # Ex: \\"aaabaaa\\" -> [[\'a\', 3], [\'b\', 1], [\'a\', 3]]\n        groups = []\n        for key, group in itertools.groupby(text):\n            groups.append([key,len(list(group))])\n            \n        # We need a counter to check if we can extend by one letter\n        # Ex: \\"aaa\\" in \\"aaabba\\" can be extended to \\"aaaa\\" because we have another \\"a\\" at the end.\n        count = collections.Counter(text)\n        \n        for index in range(len(groups)):\n            # Check if we can merge two groups.\n            # Ex \\"aaa\\" and \\"aa\\" in aaabaa\\" can be merged to \\"aaaaa\\"\n            if index <= len(groups) - 3: # Make sure to dont go out of bounds\n                # The next groups\'s length must be 1 to be able to merge\n                if groups[index+1][1] == 1 and groups[index+2][0] == groups[index][0]:\n                    groups[index][1] += groups[index+2][1]\n                    \n            # Length will be extend by 1 if there are more letters in available, as explained above.\n            if count[groups[index][0]] > groups[index][1]:\n                groups[index][1] += 1\n                \n        # Return the maximum length that exists\n        maxlength = 0\n        for group in groups:\n            if group[1] > maxlength:\n                maxlength = group[1]\n        return maxlength'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'maxRepOpt1'
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: 10976