🌏 Problem solving solutions in Swift

• Marathoners — solution
• Kth Number — solution
• String Compression — solution
• Lock and Key — solution

• Reverse Integer — solution
• Happy Number — solution
• Single Number — solution
• Roman to Integer — solution
• Valid Parentheses — solution

• Ascending Sort
  • solution in Swift (TIMEOUT)
  • solution in C
• Tree Traversal — solution

• New Year Chaos — solution
• Climbing the Leaderboard — solution
• Dynamic Array — solution
• Sparse Arrays — solution
• Balanced Brackets — solution
• Queens Attack II — solution
• Sherlock and the Valid String — solution
• Sales by match - solution