[Swift 알고리즘] 모의고사

https://programmers.co.kr/learn/courses/30/lessons/42840

func solution(_ answers:[Int]) -> [Int] {
    
    var student = [1:0,2:0,3:0]
    let firstStutdend = [1, 2, 3, 4, 5]
    let secondStutdend = [2, 1, 2, 3, 2, 4, 2, 5]
    let thirdStutdent = [3, 3, 1, 1, 2, 2, 4, 4, 5, 5]
    
    for i in 0..<answers.count {
        
        if firstStutdend[i % 5] == answers[i] {
            student[1]! += 1
        }
        if secondStutdend[i % 8] == answers[i] {
            student[2]! += 1
        }
        if thirdStutdent[i % 10] == answers[i] {
            student[3]! += 1
        }
    }
    
    let answer = student.filter{$0.value == student.values.max() }.map {$0.key}.sorted()
    
    return answer
}