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In-place Move Zeros to End of List in Python
Suppose we have a list of numbers nums, we have to put all the zeros to the end of the list by updating the list in-place. And the relative ordering of other elements should not be changed. We have to try to solve this in O(1) additional space.
So, if the input is like [2,0,1,4,0,5,6,4,0,1,7], then the output will be [2, 1, 4, 5, 6, 4, 1, 7, 0, 0, 0]
To solve this, we will follow these steps −
- if size of L is same as 0, then
- return a blank list
- k := 0
- for i in range 0 to size of L, do
- if L[i] is not same as 0, then
- L[k] := L[i]
- k := k + 1
- if L[i] is not same as 0, then
- for j in range k to size of L, do
- L[j] := 0
- return L
Let us see the following implementation to get better understanding −
Example
class Solution: def solve(self, L): if len(L) == 0: return [] k = 0 for i in range(len(L)): if L[i] != 0: L[k] = L[i] k+=1 for j in range(k,len(L)): L[j] = 0 return L ob = Solution() L = [2,0,1,4,0,5,6,4,0,1,7] print(ob.solve(L))
Input
[2,0,1,4,0,5,6,4,0,1,7]
Output
[2, 1, 4, 5, 6, 4, 1, 7, 0, 0, 0]
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