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 pieces0.

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).