# HackerRank ‘Missing Numbers’ Solution

##### Short Problem Definition:

Numeros, the Artist, had two lists A and B, such that B was a permutation of A. Numeros was very proud of these lists. Unfortunately, while transporting them from one exhibition to another, some numbers from A got left out. Can you find the numbers missing?

Sherlock and Array

##### Complexity:

time complexity is O(n)

space complexity is O(n)

##### Execution:

The problem statement informs us, that there are only 100 different values. This calls for a counting sort.0

##### Solution:
```#!/usr/bin/py
def solveMissing(n, m):
n_cnt = [0] * 101
m_cnt = [0] * 101
offset = min(m)

for ele in m:
m_cnt[ele-offset] += 1

for ele in n:
n_cnt[ele-offset] += 1

for idx in xrange(101):
if m_cnt[idx] != n_cnt[idx]:
print idx + offset,

if __name__ == '__main__':
n = int(raw_input())
arr = map(int, raw_input().split())
m = int(raw_input())
arr2 = map(int, raw_input().split())
solveMissing(arr, arr2)
```

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