题解 | #合并表记录#

let obj = {}
let arr = []

let line
while(line = readline()){
   let res = line.split(' ')
   let idx = res[0]
   let val = res[1]
   if(parseInt(val)){
       obj[idx] = obj[idx] ?  obj[idx] + +val : +val
   }
   
}
console.log(Object.entries(obj).sort((a,b)=>+a[0] - +b[0]).reduce((acc,[key,val])=>{
    return acc += key + ' ' + val + '\n'
},''))
// console.log(n)