1. Program to get a response as Excel column name for integer input. Input 1- A, 2- B, 3-C, ...26-Z,27-AA, 28-AB, 29-AC..52-AZ. 2. Find first no-repeating character in String. 3. Given a list of Name , create a map with key as LastName and value as the count of name with the LastName.

Question

1. Program to get a response as Excel column name for integer input. Input 1-> A, 2-> B, 3->C, ...26->Z,27->AA, 28->AB, 29->AC..52->AZ. 2. Find first no-repeating character in String. 3. Given a list of Name , create a map with key as LastName and value as the count of name with the LastName.

Accepted Answer

Program to convert integer to Excel column name, find first non-repeating character in a string, and create a map of last names with count of names.

For converting integer to Excel column name, you can use a recursive function to map the remainder of the division by 26 to the corresponding letter.
To find the first non-repeating character in a string, you can iterate through the string and use a HashMap to store the count of each character.
For creating a map of last names with count of names, iterate through the list of names, extract the last name, and increment the count in the map.

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