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Leetcode: happy number

Leetcode: happy number

CodeWars: highest and lowest

CodeWars: highest and lowest

CodeWars: square every digit

CodeWars: square every digit

CodeWars: sum of a sequence

CodeWars: sum of a sequence

CodeWars: sum of digits / digital root(02/21更新)

CodeWars: sum of digits / digital root(02/21更新)

CodeWars: credit card mask

CodeWars: credit card mask

Leetcode挑戰: Day15 excel sheet column title

Leetcode挑戰: Day15 excel sheet column title

Leetcode挑戰: Day14 sqrtx

Leetcode挑戰: Day14 sqrtx

Leetcode挑戰: Day13 search insert position

Leetcode挑戰: Day13 search insert position

Leetcode挑戰: Day12 plus one

Leetcode挑戰: Day12 plus one