Sometimes, I like to solve problems from competition programming. I will save some solutions here...
[LeetCode] 1974. Minimum Time to Type Word Using Special Typewriter
[LeetCode] 2816. Double a Number Represented as a Linked List
[LeetCode] 917. Reverse Only Letters
[LeetCode] 463. Island Perimeter
[LeetCode] 1700. Number of Students Unable to Eat Lunch
[LeetCode] 1249. Minimum Remove to Make Valid Parentheses
[LeetCode] 1614. Maximum Nesting Depth of the Parentheses
[LeetCode] 1221. Split a String in Balanced Strings
[LeetCode] 2958. Length of Longest Subarray With at Most K Frequency
[LeetCode] 6. Zigzag Conversion
[LeetCode] 4. Median of Two Sorted Arrays
[LeetCode] 3. Longest Substring Without Repeating Characters
[LeetCode] 2. Add Two Numbers
[LeetCode] 1. Two Sum
[LeetCode] 1759. Count Number of Homogenous Substrings
[LeetCode] 394. Decode String
[LeetCode] 8. String to Integer (atoi)
[LeetCode] 238. Product of Array Except Self
[LeetCode] 791. Custom Sort String
[LeetCode] 234. Palindrome Linked List
[LeetCode] 206. Reverse Linked List
[LeetCode] 3005. Count Elements With Maximum Frequency
[LeetCode] 224. Basic Calculator