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

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!$”
Output:  str = “ed,c,bA!$”

Asked in Coforge