Kakao 2023 New Graduate Recruitment Coding Test Round 1 Solutions Released

The Kakao 2023 New Graduate Recruitment Coding Test Round 1 was held on September 24, featuring 7 problems without efficiency tests. The difficulty level was similar to last year's, with problems arranged from easy to hard. Problem 1, 'Personal Information Collection Validity Period', determines whether the validity period has expired by converting dates to integer format for comparison or using a hash table. Problem 2, 'Emoticon Discount Event', optimizes sales revenue and subscriber count by exhaustively searching all combinations of discount rates applied to emoticons. Problem 6, 'Maze Escape Command', uses DFS to find the lexicographically smallest path, exploring directions in the order 'd', 'l', 'r', 'u'. Problem 7, 'Drop 1, 2, 3', uses a greedy strategy to find the minimum number of digits required to form the target sum for each leaf node, deriving the lexicographically smallest answer.