题解 | #整数与IP地址间的转换#

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});
let index = 0
rl.on('line', function (line) {
    index ++
    solution(line)
});
function solution(line: string) {
    if(index === 1){

        let nums = line.split(".").map(x=>Number(x))
        let binStr = nums.map(x=>x.toString(2).padStart(8,'0')).join("")
        let num = parseInt(binStr,2)
        console.log(num);
        return
    }
    if(index === 2){
        let num = Number(line)
        let binStr = num.toString(2).padStart(32,"0")
        let pat = /.{8}/g
        let strs:string[] = []
        while(true){
            let res = pat.exec(binStr)
            if(res){
                strs.push(res[0])
            }else{
                break
            }
        }
        let res = strs.map(x=>parseInt(x,2))
            .map(x=>x.toString()).join(".")
        console.log(res);
    }
}