Leetcode
2020.04.14 14:21

75. Sort Colors

조회 수 95 추천 수 0 댓글 0
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄

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/



?

List of Articles
번호 분류 제목 글쓴이 날짜 조회 수
74 Leetcode 692. Top K Frequent Words hooni 2020.04.15 87
73 Leetcode 2. Add Two Numbers hooni 2020.04.14 90
72 Leetcode 731. My Calendar II hooni 2020.04.15 94
» Leetcode 75. Sort Colors hooni 2020.04.14 95
70 Leetcode 347. Top K Frequent Elements hooni 2020.04.14 96
69 Leetcode 430. Flatten a Multilevel Doubly Linked List file hooni 2020.04.06 98
68 Leetcode 23. Merge k Sorted Lists hooni 2020.04.14 98
67 Leetcode 729. My Calendar I hooni 2020.04.15 98
66 Leetcode 253. Meeting Rooms II hooni 2020.04.15 98
65 Leetcode 20. Valid Parentheses hooni 2020.04.25 98
64 Leetcode 62. Unique Paths file hooni 2020.04.09 99
63 Leetcode 7. Reverse Integer hooni 2020.04.28 100
62 Leetcode 946. Validate Stack Sequences hooni 2020.04.08 101
61 Leetcode 973. K Closest Points to Origin hooni 2020.04.15 101
60 Leetcode 852. Peak Index in a Mountain Array hooni 2020.04.28 101
59 Leetcode 350. Intersection of Two Arrays II hooni 2020.04.28 102
58 Leetcode 443. String Compression hooni 2020.04.25 103
57 Leetcode 38. Count and Say hooni 2020.04.25 103
56 Leetcode 53. Maximum Subarray hooni 2020.04.28 106
55 Leetcode 3. Longest Substring Without Repeating Characters hooni 2020.04.09 107
Board Pagination Prev 1 2 3 4 Next
/ 4