My solution considered correct and it's solved now, but I don't think so.

public class Solution {
    public static int[][] multiArray;

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int input = scanner.nextInt();
        if (input > 0) {
            int times = input; // not needed
            multiArray = new int[input][]; // all good up till here
            // redundant and probably introduced due to weird coding later on that'll throw an exception without
            /*
            for (int i = 0; i < input; i++) {
                multiArray[i] = new int[i + 1];
            }
            */

            while (times-- > 0 && scanner.hasNext()) { // better use a for loop from 0 to multiArray.length
                // cause with counting backward you'll need ro reverse addressing of the array later
                // an exception inside your nested loop. That's probably why you have
                int second = scanner.nextInt(); // OK
                if (second > 0)
                    multiArray[multiArray.length - times - 1] = new int[second]; // that's cause of looping backwards
                // but you do a nested loop and all rows get initialized with row + 1 cells, that's not asked and wrong
                // so I'd say you're correct with your assumption, the code shouldn't validate. I think CG just tests
                // if you read the correct number of values and if you create a valid array (without counting the cells)
                /*
                if (second > 0) {
                    for (int i = 0; i < multiArray.length; i++) {
                        for (int j = 0; j < multiArray[i].length; j++) {
                            multiArray[i] = new int[i+1]; // 1.
                        }
                    }
                }
                */
            }
        }
    }
}

Scanner console = new Scanner(System.in);
int rows = console.nextInt();

multiArray = new int[rows][];
for (int row = 0; row < rows; row++) {
    multiArray[row] = new int[console.nextInt()];
}