Unique Character Count

Easy

0/40

3 upvotes

Problem statement

You are given a string str consisting of lowercase English alphabets. Your task is to determine and count the number of unique characters present in the string.

Detailed explanation ( Input/output format, Notes, Images )

Input Format:

The first line of input contains a single string str.

Output Format:

Print a single integer representing the total count of unique characters.

Note:

The string consists only of lowercase English letters ('a' through 'z').

Sample Input 1:

codingninjas

Sample Output 1:

Explanation for Sample 1:

The given string “codingninjas” contains 9 unique characters: ‘c’, ‘o’, ‘d’, ‘i’, ‘n’, ‘g’, ‘j’,'a','s'.

Sample Input 2:

madam

Sample Output 2:

Explanation for Sample 2:

The unique characters in "madam" are 'm', 'a', and 'd'. The total count is 3.

Expected Time Complexity:

The expected time complexity is O(N), where N is the length of the string.

Constraints:

1 <= N <= 10^5
`str` consists of lowercase English letters ('a'-'z').

Time limit: 1 sec

Approaches (1)

Approach 1

Unique Character Count

Time Complexity

Space Complexity

(100% EXP penalty)

Unique Character Count

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