Reverse a String Problem Statement

Given a string STR containing characters from [a-z], [A-Z], [0-9], and special characters, determine the reverse of the string.

Input:

The input starts with a single integer 'T', which represents the number of test cases. Each of the following 'T' lines contains a single string 'STR'.

Output:

For each test case, output a single line containing the reversed string 'STR'. Each result should be printed on a separate line.

Example:

Input: 2 abcde 12345 Output: edcba 54321

Constraints:

1 ≤ T ≤ 10

1 ≤ |STR| ≤ 10^5

Note:

You only need to implement the function to return the expected result; printing it is already taken care of.

Question

Reverse a String Problem Statement

Given a string STR containing characters from [a-z], [A-Z], [0-9], and special characters, determine the reverse of the string.

Input:

The input starts with a single integer 'T', which represents the number of test cases. Each of the following 'T' lines contains a single string 'STR'.

Output:

For each test case, output a single line containing the reversed string 'STR'. Each result should be printed on a separate line.

Example:

Input:
2
abcde
12345

Output:
edcba
54321

Constraints:

1 ≤ T ≤ 10
1 ≤ |STR| ≤ 10^5

Note:

You only need to implement the function to return the expected result; printing it is already taken care of.

Accepted Answer

The task is to reverse a given string containing characters from [a-z], [A-Z], [0-9], and special characters.

Iterate through the characters of the string from the end to the beginning 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.
Ensure to handle special characters and numbers along with alphabets while reversing the string.
Consider edge cases like empty string or single character string while implementing the reversal logic.

Accepted Answer

Certainly! Here's how you can approach reversing a string:
Understanding the Problem
The goal is to take a string as input and produce a new string that contains the same characters but in reverse order.
Methods to Reverse a String
 * Slicing:
   * Python's string slicing provides a concise way to reverse a string. The syntax [::-1] creates a reversed copy of the string.
 * Using a Loop:
   * You can iterate through the string from the end to the beginning and build the reversed string character by character.
 * Using reversed() and join():
   * The reversed() function returns an iterator that yields characters in reverse order. You can then use join() to combine these characters into a new string.
Example (Slicing - Most Efficient)
def reverse_string(str1):
    """
    Reverses a given string using slicing.
    """
    return str1[::-1]

# Example Usage:
input_string = "CoforgeGET2024!"
reversed_string = reverse_string(input_string)
print(f"Original string: {input_string}")
print(f"Reversed string: {reversed_string}")

Example (Loop)
def reverse_string_loop(str1):
    reversed_str = ""
    for i in range(len(str1) - 1, -1, -1):
        reversed_str += str1[i]
    return reversed_str

input_string = "CoforgeGET2024!"
reversed_string = reverse_string_loop(input_string)
print(f"Original string: {input_string}")
print(f"Reversed string: {reversed_string}")

Example (reversed() and join())
def reverse_string_reversed(str1):
    return "".join(reversed(str1))

input_string = "CoforgeGET2024!"
reversed_string = reverse_string_reversed(input_string)
print(f"Original string: {input_string}")
print(f"Reversed string: {reversed_string}")

Which Method to Choose
 * For most practical purposes, string slicing ([::-1]) is the most efficient and Pythonic way to reverse a string. It's concise and generally faster than other methods.
 * The loop method is good for understanding the underlying logic.
 * The reversed and join method is also good, but generally slicing is the most preferred method.

Accepted Answer

Input:   str = “a,b$c”
Output:  str = “c,b$a”
Explanation: Note that $ and , are not moved anywhere.  Only subsequence “abc” is reversed

Input:   str = “Ab,c,de!$”
Output:  str = “ed,c,bA!$”