staircase.js

'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
    inputString += inputStdin;
});

process.stdin.on('end', _ => {
    inputString = inputString.replace(/\s*$/, '')
        .split('\n')
        .map(str => str.replace(/\s*$/, ''));

    main();
});

function readLine() {
    return inputString[currentLine++];
}

// Complete the staircase function below.
function staircase(n) {
    
   for(let i=1;i<=n;i++){
       
       //print no of spaces n - i times
       for(let j=0;j<n-i;j++)
            process.stdout.write(' ');
            
       for(let k=0;k<i;k++)
            process.stdout.write('#');
            
        process.stdout.write('\n');
              
   }


}

function main() {
    const n = parseInt(readLine(), 10);

    staircase(n);
}