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feat: add MoveZeroes algorithm with tests #7738

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369d6b8
feat: add move-zeroes algorithm with tests
roshankumar447 Nov 7, 2026
1d052ed
Merge branch 'master' into feat/move-zeroes
roshankumar447 Nov 10, 2026
8849578
Merge remote-tracking branch 'upstream/master' into feat/move-zeroes
roshankumar447 Nov 10, 2026
0dbe729
Merge branch 'feat/move-zeroes' of https://github.com/roshankumar447/…
roshankumar447 Nov 10, 2026
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28 changes: 28 additions & 0 deletions src/main/java/com/thealgorithms/misc/MoveZeroes.java
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package com.thealgorithms.misc;

/**
* Moves all zeroes in an array to the end while maintaining the relative
* order of non-zero elements. The operation is performed in-place.
*
* <p>Example: [0, 1, 0, 3, 12] -> [1, 3, 12, 0, 0]
*
* <p>Time complexity: O(n), Space complexity: O(1)
*
* @see <a href="https://leetcode.com/problems/move-zeroes/">LeetCode #283</a>
*/
public final class MoveZeroes {
private MoveZeroes() {
}

public static void moveZeroes(int[] nums) {
int insertPos = 0;
for (int num : nums) {
if (num != 0) {
nums[insertPos++] = num;
}
}
while (insertPos < nums.length) {
nums[insertPos++] = 0;
}
}
}
36 changes: 36 additions & 0 deletions src/test/java/com/thealgorithms/misc/MoveZeroesTest.java
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package com.thealgorithms.misc;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;

import org.junit.jupiter.api.Test;

public class MoveZeroesTest {

@Test
public void testMoveZeroes() {
int[] nums = {0, 1, 0, 3, 12};
MoveZeroes.moveZeroes(nums);
assertArrayEquals(new int[] {1, 3, 12, 0, 0}, nums);
}

@Test
public void testNoZeroes() {
int[] nums = {1, 2, 3};
MoveZeroes.moveZeroes(nums);
assertArrayEquals(new int[] {1, 2, 3}, nums);
}

@Test
public void testAllZeroes() {
int[] nums = {0, 0, 0};
MoveZeroes.moveZeroes(nums);
assertArrayEquals(new int[] {0, 0, 0}, nums);
}

@Test
public void testSingleElement() {
int[] nums = {0};
MoveZeroes.moveZeroes(nums);
assertArrayEquals(new int[] {0}, nums);
}
}
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