Package g1601_1700.s1640_check_array_formation_through_concatenation

Class Solution

  • 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).

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • canFormArray

        public boolean canFormArray​(int[] arr,
                            int[][] pieces)