Package g2301_2400.s2351_first_letter_to_appear_twice

Class Solution

java.lang.Object

g2301_2400.s2351_first_letter_to_appear_twice.Solution

public class Solution
extends Object

2351 - First Letter to Appear Twice\. Easy Given a string `s` consisting of lowercase English letters, return _the first letter to appear **twice**_. **Note**: * A letter `a` appears twice before another letter `b` if the **second** occurrence of `a` is before the **second** occurrence of `b`. * `s` will contain at least one letter that appears twice. **Example 1:** **Input:** s = "abccbaacz" **Output:** "c" **Explanation:** The letter 'a' appears on the indexes 0, 5 and 6. The letter 'b' appears on the indexes 1 and 4. The letter 'c' appears on the indexes 2, 3 and 7. The letter 'z' appears on the index 8. The letter 'c' is the first letter to appear twice, because out of all the letters the index of its second occurrence is the smallest. **Example 2:** **Input:** s = "abcdd" **Output:** "d" **Explanation:** The only letter that appears twice is 'd' so we return 'd'. **Constraints:** * `2 <= s.length <= 100` * `s` consists of lowercase English letters. * `s` has at least one repeated letter.

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
char	repeatedCharacter(String s)

Methods inherited from class java.lang.Object

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

Constructor Details

Solution

public Solution()

Method Details

repeatedCharacter

public char repeatedCharacter(String s)