**In-Place Move Zeros to End of List - Amazon Top Interview Questions**

### Problem Statement :

Given a list of integers nums, put all the zeros to the back of the list by modifying the list in-place. The relative ordering of other elements should stay the same. Can you do it in \mathcal{O}(1)O(1) additional space? Constraints 0 ≤ n ≤ 100,000 where n is the length of nums Example 1 Input nums = [0, 1, 0, 2, 3] Output [1, 2, 3, 0, 0] Explanation Note that [1, 2, 3] appear in the same order as in the input.

### Solution :

` ````
Solution in C++ :
vector<int> solve(vector<int>& nums) {
int count = 0;
for (int i = 0; i < nums.size(); ++i) {
if (nums[i] != 0) {
swap(nums[i], nums[count]);
count++;
}
}
```

` ````
Solution in Java :
class Solution {
public int[] solve(int[] nums) {
int i = 0, j = 0;
while (j < nums.length) {
if (nums[j] == 0)
j++;
else
swap(nums, i++, j++);
}
return nums;
}
public void swap(int[] a, int i, int j) {
if (i == j)
return;
int temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
```

` ````
Solution in Python :
class Solution:
def solve(self, nums):
j = 0
for i in range(len(nums)):
if nums[i] != 0:
if j != i:
nums[j], nums[i] = nums[i], nums[j]
j += 1
return nums
```

## View More Similar Problems

## Array Manipulation

Starting with a 1-indexed array of zeros and a list of operations, for each operation add a value to each of the array element between two given indices, inclusive. Once all operations have been performed, return the maximum value in the array. Example: n=10 queries=[[1,5,3], [4,8,7], [6,9,1]] Queries are interpreted as follows: a b k 1 5 3 4 8 7 6 9 1 Add the valu

View Solution →## Print the Elements of a Linked List

This is an to practice traversing a linked list. Given a pointer to the head node of a linked list, print each node's data element, one per line. If the head pointer is null (indicating the list is empty), there is nothing to print. Function Description: Complete the printLinkedList function in the editor below. printLinkedList has the following parameter(s): 1.SinglyLinkedListNode

View Solution →## Insert a Node at the Tail of a Linked List

You are given the pointer to the head node of a linked list and an integer to add to the list. Create a new node with the given integer. Insert this node at the tail of the linked list and return the head node of the linked list formed after inserting this new node. The given head pointer may be null, meaning that the initial list is empty. Input Format: You have to complete the SinglyLink

View Solution →## Insert a Node at the head of a Linked List

Given a pointer to the head of a linked list, insert a new node before the head. The next value in the new node should point to head and the data value should be replaced with a given value. Return a reference to the new head of the list. The head pointer given may be null meaning that the initial list is empty. Function Description: Complete the function insertNodeAtHead in the editor below

View Solution →## Insert a node at a specific position in a linked list

Given the pointer to the head node of a linked list and an integer to insert at a certain position, create a new node with the given integer as its data attribute, insert this node at the desired position and return the head node. A position of 0 indicates head, a position of 1 indicates one node away from the head and so on. The head pointer given may be null meaning that the initial list is e

View Solution →## Delete a Node

Delete the node at a given position in a linked list and return a reference to the head node. The head is at position 0. The list may be empty after you delete the node. In that case, return a null value. Example: list=0->1->2->3 position=2 After removing the node at position 2, list'= 0->1->-3. Function Description: Complete the deleteNode function in the editor below. deleteNo

View Solution →