문제 - 1/5

[Godsenal]

• https://www.hackerrank.com/challenges/substring-diff/problem
• https://www.hackerrank.com/challenges/new-year-chaos/problem
• https://www.hackerrank.com/challenges/lego-blocks/problem

[jg116907]

unsolved

• https://www.hackerrank.com/challenges/substring-diff/problem
• https://www.hackerrank.com/challenges/lego-blocks/problem