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+# Task 1: Shortest Time
+# Submitted by: Mohammad S Anwar
+# 
+# You are given a list of time points, at least 2, in the 24-hour clock format HH:MM.
+# Write a script to find out the shortest time in minutes between any two time points.
+#
+# Example 1
+# Input: @time = ("00:00", "23:55", "20:00")
+# Output: 5
+# 
+# Since the difference between "00:00" and "23:55" is the shortest (5 minutes).
+# 
+# Example 2
+# Input: @array = ("01:01", "00:50", "00:57")
+# Output: 4
+# 
+# Example 3
+# Input: @array = ("10:10", "09:30", "09:00", "09:55")
+# Output: 15
+
+import re
+import sys
+from itertools import combinations
+
+def get_minutes(t):
+    return 60 * int(t[0:2]) + int(t[3:5])
+
+def get_diff_minutes(m1, m2):
+    res = abs(m1-m2)
+
+    if (res >= 720):        # 12h * 60 = minutes
+        return 1440 - res   # 24h * 60 = minutes
+    return res
+
+if __name__ == "__main__":
+    input = sys.argv[1:]
+    if (len(input) < 2
+        or
+        len(list(filter(lambda x: re.search(r'\d\d:\d\d', x), input))) != len(input)
+        or
+        len(list(filter(lambda x: x > '24:00', input))) != 0 ):
+        sys.exit("Input error\n")
+
+    minutes = [get_minutes(x) for x in input]
+    comb = combinations(range(len(input)), 2)
+    h_minutes = {
+        'val': None,
+        'pair': None
+    }
+
+    for pair in list(comb):
+        diff_minutes = get_diff_minutes(minutes[pair[0]], minutes[pair[1]])
+        if h_minutes['val'] == None or h_minutes['val'] > diff_minutes:
+            h_minutes['val'] = diff_minutes
+            h_minutes['pair'] = pair
+    
+    print(h_minutes['val'])
+    print("Since the difference between \"{:s}\" and \"{:s}\" is the shortest ({:d} minutes).".format(input[ h_minutes['pair'][0] ], input[ h_minutes['pair'][1] ], h_minutes['val'] ))