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;

//方法一：计数排序:您的程序使用了超过限制的内存,new Array(11111111+1)太大
// void async function(){
//     let n = await readline();
//     const cnt = new Array(11111111+1).fill(0);
//     while(n--){
//         const [index,value] = (await readline()).split(" ");
//         cnt[index-0]+=value-0;
//     }
//     for(let i = 0; i <= 11111111; i++ ){
//         if(cnt[i]) console.log(i,cnt[i]);
//     }
// }()

// 方法二：哈希表存储
void (async function () {
    let n = await readline();
    const map = new Map();
    while (n--) {
        const [index, value] = (await readline()).split(" ").map(Number);
        map.set(index,(map.get(index)||0)+value);
    }
    const res = [...map.entries()];
    // console.log(res);
    res.sort((a,b)=>a[0]-b[0]);
    res.forEach((item) => console.log(item[0],item[1]));
    
})();