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Link for the Problem – Sort Colors– LeetCode Problem
Sort Colors– LeetCode Problem
Problem:
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 either0
,1
, or2
.
Sort Colors– LeetCode Solutions
Sort Colors in C++:
class Solution { public: void sortColors(vector<int>& nums) { int l = 0; // next 0 should be put in l int r = nums.size() - 1; // next 2 should be put in r for (int i = 0; i <= r;) if (nums[i] == 0) swap(nums[i++], nums[l++]); else if (nums[i] == 1) ++i; else // we may swap a 0 to index i, but we're still not sure whether // this 0 is put in the correct index, so we can't move pointer i swap(nums[i], nums[r--]); } };
Sort Colors in Java:
class Solution { public void sortColors(int[] nums) { int l = 0; // next 0 should be put in l int r = nums.length - 1; // next 2 should be put in r for (int i = 0; i <= r;) if (nums[i] == 0) swap(nums, i++, l++); else if (nums[i] == 1) ++i; else // we may swap a 0 to index i, but we're still not sure whether // this 0 is put in the correct index, so we can't move pointer i swap(nums, i, r--); } private void swap(int[] nums, int i, int j) { final int temp = nums[i]; nums[i] = nums[j]; nums[j] = temp; } }
Sort Colors in Python:
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
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