g1301_1400.s1397_find_all_good_strings

Class Solution

java.lang.Object

g1301_1400.s1397_find_all_good_strings.Solution

public class Solution
extends Object

1397 - Find All Good Strings.

Hard

Given the strings s1 and s2 of size n and the string evil, return the number of good strings.

A good string has size n, it is alphabetically greater than or equal to s1, it is alphabetically smaller than or equal to s2, and it does not contain the string evil as a substring. Since the answer can be a huge number, return this modulo 109 + 7.

Example 1:

Input: n = 2, s1 = “aa”, s2 = “da”, evil = “b”

Output: 51

Explanation: There are 25 good strings starting with ‘a’: “aa”,“ac”,“ad”,…,“az”. Then there are 25 good strings starting with ‘c’: “ca”,“cc”,“cd”,…,“cz” and finally there is one good string starting with ‘d’: “da”.

Example 2:

Input: n = 8, s1 = “leetcode”, s2 = “leetgoes”, evil = “leet”

Output: 0

Explanation: All strings greater than or equal to s1 and smaller than or equal to s2 start with the prefix “leet”, therefore, there is not any good string.

Example 3:

Input: n = 2, s1 = “gx”, s2 = “gz”, evil = “x”

Output: 2

Constraints:

• s1.length == n
• s2.length == n
• s1 <= s2
• 1 <= n <= 500
• 1 <= evil.length <= 50
• All strings consist of lowercase English letters.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	findGoodStrings(int n, String s1, String s2, String evil)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

findGoodStrings

public int findGoodStrings(int n,
                           String s1,
                           String s2,
                           String evil)