Added medium problem

Author: das-jishu

Medium/minimum-characters-for-words.py

@@ -0,0 +1,24 @@
+
+# MINIMUM CHARACTERS FOR WORDS
+
+# O(N * L) time, N - no of words, L - length of longest word
+# O(C) space - lower bound, C - no of unique characters
+# o(N * L) space - upper bound, since there might be words having all same characters
+def minimumCharactersForWords(words):
+    # Write your code here.
+    characters = {}
+	for word in words:
+		temp = {}
+		for letter in word:
+			if letter not in temp:
+				temp[letter] = 0
+			temp[letter] += 1
+			if letter not in characters or characters[letter] < temp[letter]:
+				characters[letter] = temp[letter]
+	
+	result = []
+	for char in characters:
+		for times in range(characters[char]):
+			result.append(char)
+			
+	return result