Sort Colors In One Pass With Constant Extra Space
Sort Colors: Use Dutch National Flag algorithm with constant extra space. Initialize low, mid, high pointers. Swap nums[mid] with nums[low] if 0, move mid if 1, swap with nums[high] if 2. Continue until mid > high.
75. Sort Colors Medium Topics: Array, Two Pointers, Sorting Given an array nums with n objects colored red, white, or blue, sort them in-place so that objects of the same color are adjacent, with the colors in the order red, white, and blue. We will use the integers 0, 1, and 2 to represent the color red, white, and blue, respectively. You must solve this problem without using the library's sort function. Example 1: Input: nums = [2,0,2,1,1,0] Output: [0,0,1,1,2,2] Example 2: Input: nums = [2,0,1] Output: [0,1,2] Constraints: n == nums.length 1 <= n <= 300 nums[i] is either 0, 1, or 2....