题解 | #合并表记录#

import java.util.Scanner

fun main(args: Array<String>) {
    val read = Scanner(System.`in`)
        val res = read.nextLine().toInt()
    val map = HashMap<Int, Long>(res)
    for (i in 1..res) {
        val line = read.nextLine()
        val pair = line.split(' ').map {
            it.toInt()
        }
        map[pair[0]] = pair[1] + (map[pair[0]]?:0L)
    }
    map.forEach {
        it.apply {
            println("$key $value")
        }
    }
}