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LiveCodeBench / 2755 / extra-characters-in-a-string

Problem

Scored by the benchmark’s own harness. Use the benchmark’s own evaluation harness to check your work.

question title

extra-characters-in-a-string

question content

You are given a 0-indexed string s and a dictionary of words dictionary. You have to break s into one or more non-overlapping substrings such that each substring is present in dictionary. There may be some extra characters in s which are not present in any of the substrings.
Return the minimum number of extra characters left over if you break up s optimally.
 
Example 1:

Input: s = "leetscode", dictionary = ["leet","code","leetcode"]
Output: 1
Explanation: We can break s in two substrings: "leet" from index 0 to 3 and "code" from index 5 to 8. There is only 1 unused character (at index 4), so we return 1.


Example 2:

Input: s = "sayhelloworld", dictionary = ["hello","world"]
Output: 3
Explanation: We can break s in two substrings: "hello" from index 3 to 7 and "world" from index 8 to 12. The characters at indices 0, 1, 2 are not used in any substring and thus are considered as extra characters. Hence, we return 3.

 
Constraints:

1 <= s.length <= 50
1 <= dictionary.length <= 50
1 <= dictionary[i].length <= 50
dictionary[i] and s consists of only lowercase English letters
dictionary contains distinct words

starter code

Code

class Solution:
    def minExtraChar(self, s: str, dictionary: List[str]) -> int:

contest date

2023-05-27T00:00:00

contest id

biweekly-contest-105

difficulty

medium

platform

leetcode

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Source and history

upstream_id / Original problem ID
2755
task_id
70640610-934c-5d7b-a161-4dace90b2785
task_key
release~5fv1--test--2755
task_revision_id
4
config / split
release_v1 / test

Official source

initial import