Annai Arul Public School Interview Questions and Answers

Reverse a given string containing characters from [a-z], [A-Z], [0-9], and special characters.

• Iterate through the characters of the string from end to start and append them to a new string to get the reversed string.

• Use built-in functions like reverse() or StringBuilder in languages like Java for efficient reversal.

• Handle special characters and numbers along with alphabets while reversing the string.

• Ensure to print each reversed string on a separate line as per the output for...read more

Identify and return all characters in a string that appear more than once along with their frequency.

• Iterate through the string and count the frequency of each character using a hashmap.

• Return characters with frequency greater than 1 in an array of tuples.

The cut command in Linux is used to extract sections from each line of input.

• Used to cut out specific sections of text from a file or input stream

• Can specify the delimiter used to separate fields

• Options include -c for characters, -f for fields, and -d to specify the delimiter

• Example: cut -d',' -f1,3 file.txt

The Find command in Linux is used to search for files and directories based on specified criteria.

• Used to search for files and directories in a specified directory

• Criteria can include file name, size, permissions, and more

• Can be combined with other commands like -exec to perform actions on found files

Reverse a string and find a duplicate in an array of strings.

• To reverse a string, we can use the built-in reverse() method or loop through the string and append each character to a new string in reverse order.

• To find a duplicate in an array of strings, we can use a hash table to keep track of the frequency of each string and return the first string with a frequency greater than 1.