题解 | #合并表记录#

const rl = require("readline").createInterface({ input: process.stdin });

let result = []
rl.on('line', function(line){
    let arr = line.split(' ')
    if(arr.length == 2){
        if(result[arr[0]]){
            result[arr[0]] = result[arr[0]] + Number(arr[1])
        }else{
            result[arr[0]] = Number(arr[1])
        }
    }
})

rl.on('close', function(){
    for(let i =0; i< result.length; i++){
        if(result[i]){
            console.log(i + ' ' + result[i])
        }
    }
})