题解 | #合并表记录#

import Foundation

while let line = readLine() {

    var dict = [Int:Int]()
    
    for i in 0..<Int(String(line))! {
         let input = readLine()!.components(separatedBy:" ")
        //  print(Int(String(input.first!)))


       let index = Int(String(input.first!))!

        //  let index = Int(String(input.first!)!)!
         let values = Int(String(input.last!))!

         if let old = dict[index] { 
            dict[index] = values + old
          } else {
            dict[index] = values
          }
    }

     for key in dict.keys.sorted() {
        print("\(key) \(dict[key]!)")
    }

}