Dynamic Array | HackerRank

Declare a 2-dimensional array, , of empty arrays. All arrays are zero indexed.
Declare an integer, , and initialize it to .
There are types of queries, given as an array of strings for you to parse:
1. Query: 1 x y
  1. Let .
  2. Append the integer to .
2. Query: 2 x y
  1. Let .
  2. Assign the value to .
  3. Store the new value of to an answers array.

Note: is the bitwise XOR operation, which corresponds to the ^ operator in most languages. Learn more about it on Wikipedia. is the modulo operator.
Finally, size(arr[idx]) is the number of elements in arr[idx]

Function Description

Complete the dynamicArray function below.

dynamicArray has the following parameters:
- int n: the number of empty arrays to initialize in
- string queries[q]: query strings that contain 3 space-separated integers

Returns

int[]: the results of each type 2 query in the order they are presented

Input Format

The first line contains two space-separated integers, , the size of to create, and , the number of queries, respectively.
Each of the subsequent lines contains a query string, .

Constraints

It is guaranteed that query type will never query an empty array or index.

Sample Input

Sample Output

7
3

Explanation

Initial Values:

= [ ]
= [ ]

Query 0: Append to .

= [5]
= [ ]

Query 1: Append to .
= [5]
= [7]

Query 2: Append to .

= [5, 3]
= [7]

Query 3: Assign the value at index of to , print .

= [5, 3]
= [7]

Query 4: Assign the value at index of to , print .

= [5, 3]
= [7]