题解 | #合并表记录#

import Foundation

while let line = readLine() {
    var count = Int(line)!

    var map = [Int: Int]()
    while count > 0 {
        let row = readLine()
        let array = row!.split(separator: " ")
        let key = Int(array[0])!
        var value = Int(array[1])!
        if let v = map[key] {
            value += v
        }
        map[key] = value
        count -= 1
    }

    let keys = map.keys.sorted(by: { $0 < $1 })
    for key in keys {
        print("\(key) \(map[key]!)")
    }
}