Rearrange Characters to Make Target String — LeetCode 2287 Python Solution

The problem

You are given two 0-indexed strings s and target. You can take some letters from s and rearrange them to form new strings.

Example

Input

s = "ilovecodingonleetcode", target = "code"

Output

2

Explanation

For the first copy of "code", take the letters at indices 4, 5, 6, and 7.

Python solution

class Solution:
    def rearrangeCharacters(self, s: str, target: str) -> int:
        cnt1 = Counter(s)
        cnt2 = Counter(target)
        return min(cnt1[c] // v for c, v in cnt2.items())

Complexity

Pattern: Hash Map

Trade memory for time: remember what you have seen so the second pass never happens. LeetCode 2287. Rearrange Characters to Make Target String is filed here on both counts: the reference solution below belongs to the algorithm family this hub collects, and LeetCode tags it Hash Table and Counting.

The hash map guide has the Python template for the pattern and the 709 LeetCode problems that use it.

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