题解 | #合并表记录#

const readline = require('readline')

var rl = readline.createInterface({
    input:process.stdin,
    output:process.stdout
})
var length = 0
var arr = []
rl.on('line',(line)=>{
    if(length == 0){
         length = parseInt(line)
    }else{
        arr.push(line)
    }

})
rl.on('close',()=>{
    var res = []
    arr.forEach((val,index)=>{
        var item = val.split(' ')
        if(res[parseInt(item[0])]){
            res[parseInt(item[0])] = parseInt(res[parseInt(item[0])]) + parseInt(item[1])
        }else{
            res[parseInt(item[0])] = item[1]
        }
    })
    res.forEach((val,index)=>{
        if(val){
             console.log(index + ' ' + val)
        }
    })
})