PTA平台nodejs的输入输出控制

const readline = require('readline') //在这里引入

let testGroupNum = 0
let groupList = [] // { num: number, numArr: int[] }
let groupInfo = {}

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
})

let k = -1 //先给行数置-1,表示还没开始读取
let rows = [] //用于存储每行的输入

rl.on('line', function(line) {
  if (k < 0) {
    k = parseInt(line.trim()) * 2 //读取第一行，得到接下来输入的行数
  } else {
    rows.push(line.trim()) //将每次输入的行数据存入
    let arr = line
      .trim()
      .split(' ')
      .map(function(x) {
        return parseInt(x)
      })
    if (rows.length % 2 === 1) {
      groupInfo.num = arr[0] || 0
    } else {
      groupInfo.numArr = arr
      groupList.push(groupInfo)
      groupInfo = {} // 重置
    }
    if (k == rows.length) {
      main(groupList)
      rows = 0
      k = -1
    }
  }
})

// function exitinput() {
//   rl.on('close', function(cmd) {
//     // console.log(input.join('\n'))
//     process.exit(0)
//   })
// }
function main(list) {
  const t = +new Date()
  for (let i = 0, len = list.length; i < len; i++) {
    isInContan(list[i].numArr)
  }
  process.exit(0)
  //   console.log('cost', +new Date() - t)
}
// num
function isInContan(arr) {
  const min = Math.min.apply(null, arr)
  const max = Math.max.apply(null, arr)
  if (min == max) {
    console.log(min)
    return false
  }
  if (arr.indexOf(0) >= 0) {
    console.log('Impossible')
    return false
  }
  let minIndex = arr.indexOf(min)
  let maxIndex = arr.indexOf(max)
  arr[minIndex] = arr[maxIndex] = max - min
  isInContan(arr)
}