题解 | #合法IP#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void async function () {
    // Write your code here
    while(line = await readline()){
        console.log(getResult(line))
    }
}()
function getResult(data) {
    if (data.match(/[.]/g).length != 3) {
        return "NO"
    }
    let arr = data.split(".");
    for (let i = 0; i < arr.length; i++) {
        if (isNaN(arr[i]) || arr[i] == "") {
            return "NO"
        } else {
            if (!(arr[i] >= 0 && arr[i] <= 255)) {
                return "NO"
            }
             if(parseInt(arr[i]) + "" != arr[i]){
                return "NO"
            }
        }
    }
    return "YES"
}