Python counter and dictionary intersection example (Make a string using deletion and rearrangement)
Given two strings, find if we can make first string from second by deleting some characters from second and rearranging remaining characters.
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Input : s1 = ABHISHEKsinGH : s2 = gfhfBHkooIHnfndSHEKsiAnG Output : Possible Input : s1 = Hello : s2 = dnaKfhelddf Output : Not Possible Input : s1 = GeeksforGeeks : s2 = rteksfoGrdsskGeggehes Output : Possible
We have existing solution for this problem please refer Make a string from another by deletion and rearrangement of characters link. We will this problem quickly in python. Approach is very simple,
- Convert both string into dictionary using Counter(iterable) method, each dictionary contains characters within string as Key and their frequencies as Value.
- Now take intersection of two dictionaries and compare resultant output with dictionary of first string, if both are equal that means it is possible to convert string otherwise not.