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LeetCode Solutions

75. Sort Colors

Time: $O(n)$

Space: $O(1)$

			


class Solution {
 public:
  void sortColors(vector<int>& nums) {
    int zero = -1;
    int one = -1;
    int two = -1;

    for (const int num : nums)
      if (num == 0) {
        nums[++two] = 2;
        nums[++one] = 1;
        nums[++zero] = 0;
      } else if (num == 1) {
        nums[++two] = 2;
        nums[++one] = 1;
      } else {
        nums[++two] = 2;
      }
  }
};




			


class Solution {
  public void sortColors(int[] nums) {
    int zero = -1;
    int one = -1;
    int two = -1;

    for (final int num : nums)
      if (num == 0) {
        nums[++two] = 2;
        nums[++one] = 1;
        nums[++zero] = 0;
      } else if (num == 1) {
        nums[++two] = 2;
        nums[++one] = 1;
      } else {
        nums[++two] = 2;
      }
  }
}




			


class Solution:
  def sortColors(self, nums: List[int]) -> None:
    zero = -1
    one = -1
    two = -1

    for num in nums:
      if num == 0:
        two += 1
        one += 1
        zero += 1
        nums[two] = 2
        nums[one] = 1
        nums[zero] = 0
      elif num == 1:
        two += 1
        one += 1
        nums[two] = 2
        nums[one] = 1
      else:
        two += 1
        nums[two] = 2