Sort an Array LeetCode Solution

Problem – Sort an Array

Given an array of integers nums, sort the array in ascending order.

Example 1:

Input: nums = [5,2,3,1]
Output: [1,2,3,5]

Example 2:

Input: nums = [5,1,1,2,0,0]
Output: [0,0,1,1,2,5]

Constraints:

• 1 <= nums.length <= 5 * 104
• -5 * 104 <= nums[i] <= 5 * 104

Sort an Array LeetCode Solution in C++

void outPlaceMerge(vector<int> &nums, int low, int mid, int high) {
	if (low >= high) return;
	int l = low, r = mid + 1, k = 0, size = high - low + 1;
	vector<int> sorted(size, 0);
	while (l <= mid and r <= high)
		sorted[k++] = nums[l] < nums[r] ? nums[l++] : nums[r++];
	while (l <= mid) 
		sorted[k++] = nums[l++];
	while (r <= high) 
		sorted[k++] = nums[r++];
	for (k = 0; k < size; k++)
		nums[k + low] = sorted[k];
}

void mergeSort(vector<int> &nums, int low, int high) {
	if (low >= high) return;
	int mid = (high - low) / 2 + low;
	mergeSort(nums, low, mid);
	mergeSort(nums, mid + 1, high);
	outPlaceMerge(nums, low, mid, high);
}

Sort an Array LeetCode Solution in Java

class Solution {
    public List<Integer> sortArray(int[] nums) {
        List<Integer> res = new ArrayList<>();
        if (nums == null || nums.length == 0) return res;
        quickSort(nums, 0, nums.length - 1);
        for (int i : nums) res.add(i);
        return res;
    }
    private void quickSort(int[] nums, int l, int r) {
        if (l >= r) return;
        int mid = partition(nums, l, r);
        quickSort(nums, l, mid);
        quickSort(nums, mid + 1, r);
    }
    private int partition(int[] nums, int l, int r) {
        int pivot = nums[l];
        while (l < r) {
            while (l < r && nums[r] >= pivot) r--;
            nums[l] = nums[r];
            while (l < r && nums[l] <= pivot) l++;
            nums[r] = nums[l];
        }
        nums[l] = pivot;
        return l;
    }
}

Sort an Array LeetCode Solution in Python

def quicksort(self, nums):
    if len(nums) <= 1:
        return nums

    pivot = random.choice(nums)
    lt = [v for v in nums if v < pivot]
    eq = [v for v in nums if v == pivot]
    gt = [v for v in nums if v > pivot]

    return self.quicksort(lt) + eq + self.quicksort(gt)

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