Leetcode
2020.04.14 14:21

75. Sort Colors

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Given an array 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.

Here, we will use the integers 0, 1, and 2 to represent the color red, white, and blue respectively.

Note: You are not suppose to use the library's sort function for this problem.

Example:

Input: [2,0,2,1,1,0]
Output: [0,0,1,1,2,2]

Follow up:

  • A rather straight forward solution is a two-pass algorithm using counting sort.
    First, iterate the array counting number of 0's, 1's, and 2's, then overwrite array with total number of 0's, then 1's and followed by 2's.
  • Could you come up with a one-pass algorithm using only constant space?


class Solution {
    public void sortColors(int[] nums) {
        if(nums == null || nums.length == 0){
            return;
        }
        
        int left = 0;
        int right = nums.length - 1;
        
        for(int i=0; i<=right; i++){
            if(nums[i] == 0){
                int tmp = nums[left];
                nums[left] = nums[i];
                nums[i] = tmp;
                left++;
            }else if(nums[i] == 2){
                int tmp = nums[right];
                nums[right] = nums[i];
                nums[i] = tmp;
                i--;
                right--;
            }
        }
    }
}

[문제] https://leetcode.com/problems/sort-colors/



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