Unique Element In Sorted Array

Nobita wants to impress Shizuka by correctly guessing her lucky number. Shizuka provides a sorted list where every number appears twice, except for her lucky number, which appears only once. Your task is to find this unique lucky number for Nobita.

Example:

Input:
T = 2
N = 7
list = [1, 1, 2, 2, 3, 4, 4]
N = 5
list = [5, 5, 7, 8, 8]
Output:
3
7
Explanation:

For the first test case, the number 3 appears only once in the list, whereas others appear twice. Similarly, for the second test case, the number 7 is the lucky number.

Constraints:

  • 1 <= T <= 5
  • 1 <= N <= 105
  • 0 <= data <= 109 where ‘data’ is the value of elements in Shizuka’s list.
  • Time Limit: 1 sec
Note:
You do not need to print anything; the output should be returned by implementing the function provided.
AnswerBot
2d

Find the unique element in a sorted array where all other elements appear twice.

  • Iterate through the array and XOR all elements to find the unique element.

  • Use a hash set to keep track of elements and f...read more

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