Zeros To The End (Main Thread)

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Here is the interview question prompt, presented for reference.

Write a method that moves all zeros in an array to its end. You should maintain the order of all other elements. Here's an example:

zerosToEnd([1, 0, 2, 0, 4, 0])
// [1, 2, 4, 0, 0, 0]

Here's another one:

zerosToEnd([1, 0, 2, 0, 4, 0])
// [1, 2, 4, 0, 0, 0]

Fill in the following function signature:

function zerosToEnd(nums) {
  return;
};

Can you do this without instantiating a new array?

Length of the array <= 100000
The array will always contain integer values between -1000000000 and 1000000000
Expected time complexity : O(n)
Expected space complexity : O(1)

You can see the full challenge with visuals at this link.

Challenges • Asked about 5 years ago by Anonymous

Jake from AlgoDaily Commented on May 26, 2020:

This is the main discussion thread generated for Zeros To The End.

Anonymous Commented on May 26, 2020:

The coding language choices are only javascript and python. It would be really nice if we could have C++ too.

Anonymous Commented on May 27, 2020:

[deleted]

Jake from AlgoDaily Commented on Aug 11, 2020:

C++ is coming soon, probably this spring 2021.

Vits94 Commented on Apr 08, 2021:

// Time - O(n), Space - O(1) :

public int[] zeroesToEnd(int[] A){
int n = A.length;
int pos = 0;

for (int i = 0; i < n; i++){
if (A[i] == 0){
pos++;
} else if (pos > 0){
A[i - pos] = A[i]
A[i] = 0;
}
}

return A;
}