JSFiddle - React, Tailwind, and code Playground

by A A

HTML

<div id="root">

</div>

JavaScript

//подря идущие 1
//получить данные
let n = prompt("first line", 0);
let arr = []

const elem = document.getElementById("root");

for (let i = 0; i < n; i++) {
  arr[i] = prompt(`${i} line`, 0);
}

//работа с данными

let longest = 0;
let longestLength = 0;

for (let i = 1; i < arr.length; i++) {
  if (arr[i].indexOf("1") >= 0) {
    console.log("this value is = ", arr[i], "it's number is ", [i])
    let length = 0;
    for (let j = arr[i].indexOf("1"); j < arr[i].length; j++) {
      if (arr[i][j].indexOf("1") === 0) {
        ++length;
        console.log("this value is = ", arr[i][j], "length = ", length)
        longestLength = length;
      } else {
        console.log("this value is = ", arr[i][j], "length = ", length)
        length = 0;
      }
    }
    if (longestLength > longest) {
      longest = longestLength
    }
  }
}

console.log("longest = ", longest);
elem.innerHTML = longest;