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🌏 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