Merge pull request #10860 from pauloscustodio/master

Add Python solutions

2 files changed, 93 insertions, 0 deletions

diff --git a/challenge-060/paulo-custodio/python/ch-1.py b/challenge-060/paulo-custodio/python/ch-1.py
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+++ b/challenge-060/paulo-custodio/python/ch-1.py
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+#!/usr/bin/env python3
+
+# Challenge 060
+#
+# TASK #1 > Excel Column
+# Reviewed by: Ryan Thompson
+# Write a script that accepts a number and returns the Excel Column Name it
+# represents and vice-versa.
+#
+# Excel columns start at A and increase lexicographically using the 26 letters
+# of the English alphabet, A..Z. After Z, the columns pick up an extra "digit",
+# going from AA, AB, etc., which could (in theory) continue to an arbitrary
+# number of digits. In practice, Excel sheets are limited to 16,384 columns.
+#
+# Example
+# Input Number: 28
+# Output: AB
+#
+# Input Column Name: AD
+# Output: 30
+
+import re
+import sys
+
+def col2num(col):
+    num = 0
+    for digit in col:
+        num = 26*num + ord(digit)-ord('A') + 1
+    return num
+
+def num2col(num):
+    col = ""
+    while num > 0:
+        digit = (num-1) % 26
+        num = int((num-1) / 26)
+        col = chr(ord('A')+digit) + col
+    return col
+
+arg = sys.argv[1]
+if re.search(r'^\d+$', arg):
+    print(num2col(int(arg)))
+else:
+    print(col2num(arg))
diff --git a/challenge-060/paulo-custodio/python/ch-2.py b/challenge-060/paulo-custodio/python/ch-2.py
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+#!/usr/bin/env python3
+
+# Challenge 060
+#
+# TASK #2 > Find Numbers
+# Reviewed by: Ryan Thompson
+# Write a script that accepts list of positive numbers (@L) and two positive
+# numbers $X and $Y.
+#
+# The script should print all possible numbers made by concatenating the numbers
+# from @L, whose length is exactly $X but value is less than $Y.
+#
+# Example
+# Input:
+#
+# @L = (0, 1, 2, 5);
+# $X = 2;
+# $Y = 21;
+# Output:
+#
+# 10, 11, 12, 15, 20
+
+import sys
+
+def combine1(combin, prefix, n, digits):
+    if len(prefix) == n:
+        num = int(prefix)
+        if not num in combin:
+            combin.add(num)
+    else:
+        for digit in digits:
+            combine1(combin, prefix+digit, n, digits)
+
+def combine(digits):
+    combin = set()
+    for n in range(1, len(digits)+1):
+        combine1(combin, "", n, digits)
+    nums = sorted(list(combin))
+    return nums
+
+def numbers(X, Y, L):
+    nums = combine(L)
+    nums = list(filter(lambda x:len(str(x))==X and x<Y, nums))
+    return nums
+
+X = int(sys.argv[1])
+Y = int(sys.argv[2])
+L = sys.argv[3:]
+nums = numbers(X, Y, L)
+print(", ".join(map(str, nums)))