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This approach uses two pointers: one to track the position for the next non-zero element and the other to iterate through the array. We move all non-zero elements to the beginning of the array using these two pointers and fill the remaining positions with zeroes.
Time Complexity: O(n), where n is the length of the array. We make a single pass through the array.
Space Complexity: O(1), as we perform the operation in place.
1#include <stdio.h>
2
3void moveZeroes(int* nums, int numsSize) {
4 int lastNonZeroFoundAt = 0;
5 for (int i = 0; i < numsSize; i++) {
6 if (nums[i] != 0) {
7 nums[lastNonZeroFoundAt++] = nums[i];
8 }
9 }
10 for (int i = lastNonZeroFoundAt; i < numsSize; i++) {
11 nums[i] = 0;
12 }
13}The code defines a function moveZeroes that takes an array nums and its size numsSize. The function maintains a pointer lastNonZeroFoundAt to keep track of the position to place the next non-zero element. As we iterate through nums, we shift non-zero elements to the front and then fill the remaining elements with zeroes.
This method uses a two-pointer technique where we place one pointer at the beginning of the array and the other to iterate through the array. Whenever we encounter a non-zero element, we swap it with the first pointer's position, allowing us to effectively move zeroes to the end by swapping.
Time Complexity: O(n), single iteration with swaps.
Space Complexity: O(1), in-place swaps.
1defThe Python version leverages tuple unpacking to swap elements at positions j and i. The j pointer ensures that swaps occur only with zeros, keeping all non-zero elements ordered.