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g2401_2500.s2478_number_of_beautiful_partitions.readme.md Maven / Gradle / Ivy

2478\. Number of Beautiful Partitions

Hard

You are given a string `s` that consists of the digits `'1'` to `'9'` and two integers `k` and `minLength`.

A partition of `s` is called **beautiful** if:

*   `s` is partitioned into `k` non-intersecting substrings.
*   Each substring has a length of **at least** `minLength`.
*   Each substring starts with a **prime** digit and ends with a **non-prime** digit. Prime digits are `'2'`, `'3'`, `'5'`, and `'7'`, and the rest of the digits are non-prime.

Return _the number of **beautiful** partitions of_ `s`. Since the answer may be very large, return it **modulo** 109 + 7.

A **substring** is a contiguous sequence of characters within a string.

**Example 1:**

**Input:** s = "23542185131", k = 3, minLength = 2

**Output:** 3

**Explanation:** There exists three ways to create a beautiful partition: 

"2354 | 218 | 5131" 

"2354 | 21851 | 31" 

"2354218 | 51 | 31"

**Example 2:**

**Input:** s = "23542185131", k = 3, minLength = 3

**Output:** 1

**Explanation:** There exists one way to create a beautiful partition: "2354 | 218 | 5131".

**Example 3:**

**Input:** s = "3312958", k = 3, minLength = 1

**Output:** 1

**Explanation:** There exists one way to create a beautiful partition: "331 | 29 | 58".

**Constraints:**

*   `1 <= k, minLength <= s.length <= 1000`
*   `s` consists of the digits `'1'` to `'9'`.