Rearrange Characters to Make Target String
The problem can be approached by counting the occurrences of each character in both strings s
and target
. The maximum number of copies of target
that can be formed from s
will be the minimum count of a character in s
divided by the count of that character in target
, for each character in target
.
Here is a step-by-step thought process:
First, create two dictionaries (or hash maps),
s_count
andtarget_count
, to store the counts of each character ins
andtarget
respectively.Iterate through each character in
s
, incrementing the corresponding count ins_count
.Do the same for
target
, incrementing counts intarget_count
.Initialize a variable
max_copies
to a large value. This variable will store the maximum number of copies oftarget
that can be formed.For each character in
target_count
, compute the number of copies that can be formed using the character counts froms
andtarget
. This is done by dividing the count of the character ins_count
by its count intarget_count
.If this number is less than
max_copies
, updatemax_copies
to this value.Return
max_copies
as the maximum number of copies oftarget
that can be formed froms
.
Python code:
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In this code, the Counter
object from the collections
module is used to count the occurrences of characters in the strings s
and target
. We iterate over each character in target_count
, checking if it exists in s_count
. If it does, we calculate the number of copies that can be made from that character and update max_copies
if it’s less than the current max_copies
. If a character from target
is not present in s
, we return 0 since we can’t form any copy of target
without this character. The function finally returns the max_copies
as the solution.