Add comprehensive LeetCode solutions index documentation

src/exercises/248.strobogrammatic-number-iii.py

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+from string import *
+from re import *
+from datetime import *
+from collections import *
+from heapq import *
+from bisect import *
+from copy import *
+from math import *
+from random import *
+from statistics import *
+from itertools import *
+from functools import *
+from operator import *
+from io import *
+from sys import *
+from json import *
+from builtins import *
+import string
+import re
+import datetime
+import collections
+import heapq
+import bisect
+import copy
+import math
+import random
+import statistics
+import itertools
+import functools
+import operator
+import io
+import sys
+import json
+from typing import *
+
+
+# @leet start
+class Solution:
+    def strobogrammaticInRange(self, low: str, high: str) -> int:
+        def gen_str(l):
+            if l == 0:
+                return [""]
+            if l == 1:
+                return ["0", "1", "8"]
+            sub_ans = []
+            for n in gen_str(l - 2):
+                for pair in ("11", "88", "69", "96"):
+                    sub_ans.append(pair[0] + n + pair[1])
+                if l != num_l:
+                    sub_ans.append("0" + n + "0")
+            return sub_ans
+
+        min_l, max_l = len(low), len(high)
+        low, high = int(low), int(high)
+        count = 0
+
+        for num_l in range(min_l, max_l + 1):
+            for num_str in gen_str(num_l):
+                if low <= int(num_str) <= high:
+                    count += 1
+        return count
+
+
+# @leet end
+