Hello,

Here are my solutions for the second part of the card: Arrays 101, from LeetCode.

## Duplicate Zeroes#

Given an array of integers, remove duplicate zeroes and shift the remaining elements.

``````class Solution:
def duplicateZeros(self, arr: List[int]) -> None:
"""
Do not return anything, modify arr in-place instead.
"""
index = 0
arr_length = len(arr)
while index < arr_length:
if arr[index] == 0:
arr.insert(index, 0)
arr.pop()
index += 1
index += 1
``````

## Merge Sorted Array#

Given two sorted arrays, merge them together into nums1.

This problem wasn’t very Pythonic and I actually want to practice my problem solving skills together with my Python skills, so, I’ve took the liberty to modify the problem a little:

``````from typing import List

class Solution:
def merge(self, nums1: List[int], nums2: List[int]) -> None:
"""
Do not return anything, modify nums1 in-place instead.
"""
n = len(nums2)
# remove 0 from nums1
nums2_index = 0

for i, num in enumerate(nums1):
# We've reached the end of nums2, means we're merged.
if nums2_index == n:
break
if nums2[nums2_index] <= num:
nums1.insert(i, nums2[nums2_index])
nums2_index += 1

# If there's anything left in nums2 we'll add it to the end
for item in nums2[nums2_index:]:
nums1.append(item)

if __name__ == '__main__':
s = Solution()
a = [1,2,3]
s.merge(a, [2,5,6])
print(a)
``````

Thank you!

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