Leetcode Problem 1640. Check Array Formation Through Concatenation

1640. Check Array Formation Through Concatenation

Leetcode Solutions

HashMap Approach

  1. Create a hashmap mapping to store the first integer of each piece as the key and the entire piece as the value.
  2. Initialize an index i to 0 to track the current position in arr.
  3. While i is less than the length of arr, do the following: a. Check if arr[i] is in the hashmap mapping. b. If not, return false as no piece starts with arr[i]. c. Retrieve the piece from mapping using arr[i] as the key. d. Check if the piece matches the subarray of arr starting at index i. e. If it matches, increment i by the length of the piece. f. If it does not match, return false.
  4. If the end of arr is reached, return true.
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One by One Approach

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