Merge branch 'master' of github.com:manwar/perlweeklychallenge-club into challenges

1 files changed, 47 insertions, 0 deletions

diff --git a/challenge-249/packy-anderson/python/ch-1.py b/challenge-249/packy-anderson/python/ch-1.py
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+++ b/challenge-249/packy-anderson/python/ch-1.py
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+#!/usr/bin/env python
+
+from collections import Counter
+
+def equalPairs(nums):
+    pairs = []
+    num_count = Counter()
+    # count how many of each int we have
+    for num in nums:
+        num_count[num] += 1
+
+    # first, make sure we have even numbers of each integer
+    for k, v in dict(num_count).items():
+        if v % 2 == 0: # it's even, we can make pairs
+            continue
+        else:
+            return pairs # we have an odd number, no pairs
+
+    # now make pairs from those integers
+    for k, v in dict(num_count).items():
+        count = v # the values k, v are read-only
+        while count > 0:
+            pairs.append( [k, k] )
+            count -= 2
+
+    return pairs
+
+def comma_join(arr):
+    return ', '.join(map(lambda i: str(i), arr))
+
+def solution(nums):
+    print(f'Input: @ints = ({comma_join(nums)})')
+    pairs = equalPairs(nums)
+    if len(pairs) == 0:
+        print('Output: ()')
+    else:
+        pairs = [ f'({x[0]}, {x[1]})' for x in pairs ]
+        print(f"Output: { ', '.join(pairs) }")
+
+print('Example 1:')
+solution([3, 2, 3, 2, 2, 2])
+
+print('\nExample 2:')
+solution([1, 2, 3, 4])
+
+print('\nExample 3:')
+solution([1, 2, 3, 4, 4, 3, 2, 1])
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