题解 | #整数与IP地址间的转换#

while(line = readline()) {
  if(line.includes(".")) {
    toNum(line)
  } else {
    toIp(line)
  }
}
function toIp(num) {
  const str = Number(num).toString(2).padStart(32, "0")
  const arr = [str.slice(0,8), str.slice(8,16), str.slice(16,24), str.slice(24,32)]
  const ip = arr.map(ele => parseInt(ele, 2)).join(".")
  print(ip)
}

function toNum(ip) {
  const arr = ip.split(".").map(ele => Number(ele).toString(2)).map(ele => ele.padStart(8, "0"))
  const num = arr.join("")
  print(parseInt(num, 2))
}

// const a = "10"
// const b = "10".padStart(8, "0")
// print(b)