题解 | #合并表记录#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void async function () {
    line = await readline();
    // Write your code here
    let kvArr = new Map();
     let numArr = [];
    while(line = await readline()){
        numArr = line.split(' ').filter(item => item !== '').map(Number);
        if(kvArr.get(numArr[0])){
            kvArr.set(numArr[0], kvArr.get(numArr[0])+numArr[1]);
        }else {
            kvArr.set(numArr[0],numArr[1]);
        }
    }
    // 按照键值对的key进行排序
    kvArr = new Map([...kvArr].sort((a,b)=>a[0]-b[0]))
    kvArr.forEach((value, key)=>{
        console.log(key+' ' +value);
    })
}()