题解 | #合并表记录#

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});
let temp = 0;
let arr = [];
let key;
let value;
let sign = true;
rl.on('line', function (line) {
    sign=true
    if(temp>0){
        key=line.split(' ')[0]-0;
        value=line.split(' ')[1]-0;
        for(let i = 0;i<arr.length;i++){
            if(arr[i].key == key){
                arr[i].value+=value
                sign = false
            }
        }
        sign && arr.push({key,value})
    }
    temp++;
});
rl.on('close', function () {
arr.sort((a,b)=>{
    return a.key - b.key
});
  arr.map((item)=>{
    console.log(item.key+' '+item.value)
  })
})