OK, I give up. I don't understand what's wrong with my JavaScript code and testcase #5. I have tested locally and my output is exactly the same! but online is the only one it fails.

Could anyone please give me a piece of advice?

Here is my solution for this problem:

function processData(input) {
    input = input.trim().split('\n');
    var n = parseInt(input[0]);
    var numbers = [];
    for (var i = 0; i < 100; i++) {
        numbers[i] = [];
    }
    var half = n / 2;
    for (i = 1; i <= n; i += 1) {
        var obj = input[i].trim().split(' ');
        var number = parseInt(obj[0]);
        var string = obj[1];
        if (i <= half) {
            string = '-';
        }
        numbers[number].push(string);
    }
    var result = '';
    for (i = 0; i < 100; i += 1) {
        var len = numbers[i].length;
        for (var j = 0; j < len; j += 1) {
            result += numbers[i][j] + ' ';
        }
    }
    console.log(result.trim());
}

I will also say that I've submitted it four times by now, and the reason is that I've been having a lot of troubles lately with some algorithms, my solution is fine and for no reason it aborts or stops, then when I resubmit my solution without any changes then it passes all testcases. It happened with the counting-sort3:

https://www.hackerrank.com/challenges/countingsort3/submissions/code/24286586

https://www.hackerrank.com/challenges/countingsort3/submissions/code/24285109

and quicksort-in-place:

https://www.hackerrank.com/challenges/quicksort3/submissions/code/24275323

https://www.hackerrank.com/challenges/quicksort3/submissions/code/24275135

please, help! :(