题解 | #合并表记录# JavaScript node

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
    let num = parseInt(await readline()); //第一个数,表示要输入的键值对个数
    let obj = {};
    for (let i = 0; i < num; i++) {
        let str = await readline();
        let [k, v] = str.split(" ");
        if (obj[k]) {
            //如果存在就加
            obj[k] = obj[k] + parseInt(v);
        } else {
            //如果不存在就赋值
            obj[k] = parseInt(v);
        }
    }
    //console.log(obj) //这里打印发现js对象会自动按照键的值排序
    for (let j in obj) {
        console.log(j + " " + obj[j]);
    }
})();