algorithm playground

• leetcode
• several coding tests
• etc..

• start from swift 5
• patterns

• linear queue
• circular queue
• linked list
• factorial
• binomial coefficient
• fibonacci
• how many case to pay
• integer partition
• n-bit gray code
• path finder
• find prime number
• find subset
• thief's knapsack
• find comboset
• check alphametic
• self descriptive