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 () {
    // Write your code here
	// 键值对首推new Map()
    const xp = new Map(); // 存储键值对
    const indexArr = [];
    while(line = await readline()){
        let tokens = line.split(' ');
        let a = tokens[0];
        let b = tokens[1];
        if(a && b){
            if(xp.has(a)){
                // 如果存在相同的键，则值相加
                xp.set(a, parseInt(b) + parseInt(xp.get(a)))
            }else{
                xp.set(a, b);
                // 如果不相同的键，则单独存储并键放入排序数组中
                indexArr.push(parseInt(a));
            }
        }
    }
    // Map的索引值排序
    indexArr.sort((a, b)=>a-b);
    for(var s of indexArr){
        console.log(s+' '+ xp.get(s+''));
    }
}()