Skip to main content

6 Zigzag Conversion Leetcode Problem Javascript Solution

Zigzag conversion from leetcode in Javascript

Solution

const zigzag = (str, num) => {
  if (num === 1) {
    return str;
  }
  let check = true;
  let result = [];
  let i = 0;
  while (i < str.length) {
    result.push([]);
    let j = 0;
    while (j < num) {
      if (check){
        result[result.length-1].push(str[i]);
        i++;
      } else {
        if (j == 0) {
          result[result.length-1].push(null);
        } else if (j === num-1) {
          result[result.length-1].unshift(null);
        } else {
          result[result.length-1].unshift(str[i]);
          i++;
        }
      }
      j++;
    }
    check = !check;
  }
  let zigzag = [];
  for (let k = 0; k < num; k++){
    for(let l = 0; l < result.length; l++) {
      zigzag.push(result[l][k]);
    }
  }
  return zigzag.join("");
}

Example Input

zigzag("ABCD", 3)

Output

ABDC

Run

Comments

Post a Comment

Popular posts from this blog

Difference between .exec() and .execPopulate() in Mongoose?

Here I answer what is the difference between .exec() and .execPopulate() in Mongoose? .exec() is used with a query while .execPopulate() is used with a document Syntax for .exec() is as follows: Model.query() . populate ( 'field' ) . exec () // returns promise . then ( function ( document ) { console . log ( document ); }); Syntax for .execPopulate() is as follows: fetchedDocument . populate ( 'field' ) . execPopulate () // returns promise . then ( function ( document ) { console . log ( document ); }); When working with individual document use .execPopulate(), for model query use .exec(). Both returns a promise. One can do without .exec() or .execPopulate() but then has to pass a callback in populate.
1 comment
Read more

Two Ways of rendering in React Examples

Two Ways of rendering in React Examples 1 - Render twice HTML < div id = "p1" ></ div > < div id = "p2" ></ div > CSS . person { display : inline - block ; margin : 10px ; border : 1px solid # eee ; box - shadow : 0 2px 2px # ccc ; } JAVASCRIPT (Babel) function Person ( props ) { return ( < div className = ' person "> < h1 >{ props . name }</ h1 > < p > Age :{ props . age }</ p > </ div > ); } ReactDOM . render (< Person name = "VK" age = "29" />, document . querySselector ( '#p1' )); ReactDOM . render (< Person name = "HK" age = "28" />, document . querySselector ( '#p2' )); 2 Render all at once HTML < div id = "app" ></ div > CSS . person { display : inline - block ; margin : 1...
Post a Comment
Read more

Resolve: Uncaught TypeError: firebase.database is not a function

If you are getting the error: Uncaught TypeError: firebase.database is not a function Resolve it by including firebase-database.js in your html page as follows: <!-- The core Firebase JS SDK is always required and must be listed first --> <script defer src = "https://www.gstatic.com/firebasejs/6.2.4/firebase-app.js" ></script> <script defer src = "https://www.gstatic.com/firebasejs/3.1.0/firebase-database.js" ></script> That is it. Let me know if this was helpful.
Post a Comment
Read more