public class Solution
extends Object
1640 - Check Array Formation Through Concatenation\.
Easy
You are given an array of **distinct** integers `arr` and an array of integer arrays `pieces`, where the integers in `pieces` are **distinct**. Your goal is to form `arr` by concatenating the arrays in `pieces` **in any order**. However, you are **not** allowed to reorder the integers in each array `pieces[i]`.
Return `true` _if it is possible_ _to form the array_ `arr` _from_ `pieces`. Otherwise, return `false`.
**Example 1:**
**Input:** arr = [15,88], pieces = \[\[88],[15]]
**Output:** true
**Explanation:** Concatenate [15] then [88]
**Example 2:**
**Input:** arr = [49,18,16], pieces = \[\[16,18,49]]
**Output:** false
**Explanation:** Even though the numbers match, we cannot reorder pieces[0].
**Example 3:**
**Input:** arr = [91,4,64,78], pieces = \[\[78],[4,64],[91]]
**Output:** true
**Explanation:** Concatenate [91] then [4,64] then [78]
**Constraints:**
* `1 <= pieces.length <= arr.length <= 100`
* `sum(pieces[i].length) == arr.length`
* `1 <= pieces[i].length <= arr.length`
* `1 <= arr[i], pieces[i][j] <= 100`
* The integers in `arr` are **distinct**.
* The integers in `pieces` are **distinct** (i.e., If we flatten pieces in a 1D array, all the integers in this array are distinct).