Count the Number of Special Characters II - Practice Coding | SlaveCode
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3121. Count the Number of Special Characters II
Medium
30 Points
Hash Table
String
You are given a string word. A letter c is called special if it appears both in lowercase and uppercase in word, and every lowercase occurrence of c appears before the first uppercase occurrence of c.
Return the number of special letters in word.
Examples
Example 1
Input: word = "aaAbcBC"
Output: 3
Explanation:
The special characters are 'a' , 'b' , and 'c' .
Example 2
Input: word = "abc"
Output: 0
Explanation:
There are no special characters in word .
Example 3
Input: word = "AbBCab"
Output: 0
Explanation:
There are no special characters in word .
Constraints
1 <= word.length <= 2 * 105
word consists of only lowercase and uppercase English letters.
3121. Count the Number of Special Characters II
Medium
30 Points
Hash Table
String
You are given a string word. A letter c is called special if it appears both in lowercase and uppercase in word, and every lowercase occurrence of c appears before the first uppercase occurrence of c.
Return the number of special letters in word.
Examples
Example 1
Input: word = "aaAbcBC"
Output: 3
Explanation:
The special characters are 'a' , 'b' , and 'c' .
Example 2
Input: word = "abc"
Output: 0
Explanation:
There are no special characters in word .
Example 3
Input: word = "AbBCab"
Output: 0
Explanation:
There are no special characters in word .
Constraints
1 <= word.length <= 2 * 105
word consists of only lowercase and uppercase English letters.