Add comprehensive LeetCode solutions index documentation

src/exercises/66.plus-one.py

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+# @leet imports start
+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 imports end
+
+
+# @leet start
+class Solution:
+    def plusOne(self, digits: List[int]) -> List[int]:
+        def sumDigits(arr, con, i):
+            if i < 0:
+                arr.insert(0, con)
+                return arr
+            if con != None:
+                n = arr[i] + con
+            else:
+                n = arr[i] + 1
+            if n < 10:
+                arr[i] = n
+            else:
+                ci = n % 10
+                con = n // 10
+                arr[i] = ci
+                return sumDigits(arr, con, i - 1)
+            return arr
+
+        return sumDigits(digits, None, len(digits) - 1)
+
+
+# @leet end
+