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var students: [[String: Any]] = [
    ["firstName": "John", "lastName": "Wilson", "gpa": 2.4],
    ["firstName": "Nancy", "lastName": "Smith", "gpa": 3.5],
    ["firstName": "Michael", "lastName": "Liu", "gpa": 3.1]
]

var highestGPAStudent: [String: Any]?

for student in students {
    if let currentGPA = student["gpa"] as? Double {
        if let maxGPAStudent = highestGPAStudent, let maxGPA = maxGPAStudent["gpa"] as? Double {
            if currentGPA > maxGPA {
                highestGPAStudent = student
            }
        } else {
            highestGPAStudent = student
        }
    }
}

if let highestGPAStudent = highestGPAStudent,
    let firstName = highestGPAStudent["firstName"] as? String,
    let lastName = highestGPAStudent["lastName"] as? String {
    print("Student with the highest GPA: \(firstName) \(lastName)")
} else {
    print("No student records found.")
}