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Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for the Single Number II in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

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Link for the ProblemSingle Number II– LeetCode Problem

Single Number II– LeetCode Problem

Problem:

Given an integer array nums where every element appears three times except for one, which appears exactly onceFind the single element and return it.

You must implement a solution with a linear runtime complexity and use only constant extra space.

Example 1:

Input: nums = [2,2,3,2]
Output: 3

Example 2:

Input: nums = [0,1,0,1,0,1,99]
Output: 99

Constraints:

  • 1 <= nums.length <= 3 * 104
  • -231 <= nums[i] <= 231 - 1
  • Each element in nums appears exactly three times except for one element which appears once.
Single Number II– LeetCode Solutions
Single Number II Solution in C++:
class Solution {
 public:
  int singleNumber(vector& nums) {
    int ones = 0;
    int twos = 0;

    for (const int num : nums) {
      ones ^= (num & ~twos);
      twos ^= (num & ~ones);
    }

    return ones;
  }
};
Single Number II Solution in Java:
class Solution {
  public int singleNumber(int[] nums) {
    int ones = 0;
    int twos = 0;

    for (final int num : nums) {
      ones ^= (num & ~twos);
      twos ^= (num & ~ones);
    }

    return ones;
  }
}
Single Number II Solution in Python:
class Solution:
  def singleNumber(self, nums: List[int]) -> int:
    ones = 0
    twos = 0

    for num in nums:
      ones ^= (num & ~twos)
      twos ^= (num & ~ones)

    return ones

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