Class Solution
java.lang.Object
g1601_1700.s1641_count_sorted_vowel_strings.Solution
public class Solution
extends java.lang.Object
1641 - Count Sorted Vowel Strings.
Medium
Given an integer n
, return the number of strings of length n
that consist only of vowels (a
, e
, i
, o
, u
) and are lexicographically sorted.
A string s
is lexicographically sorted if for all valid i
, s[i]
is the same as or comes before s[i+1]
in the alphabet.
Example 1:
Input: n = 1
Output: 5
Explanation: The 5 sorted strings that consist of vowels only are ["a","e","i","o","u"].
Example 2:
Input: n = 2
Output: 15
Explanation: The 15 sorted strings that consist of vowels only are
[“aa”,“ae”,“ai”,“ao”,“au”,“ee”,“ei”,“eo”,“eu”,“ii”,“io”,“iu”,“oo”,“ou”,“uu”].
Note that “ea” is not a valid string since ‘e’ comes after ‘a’ in the alphabet.
Example 3:
Input: n = 33
Output: 66045
Constraints:
1 <= n <= 50
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Constructor Summary
Constructors -
Method Summary
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Constructor Details
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Solution
public Solution()
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Method Details
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countVowelStrings
public int countVowelStrings(int n)
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