How to Solve Codeforce 4C in Python?

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Codeforces problem 4C, also known as “Registration System”, asks us to implement a registration system that can handle unique usernames.

Here’s how to solve this problem in Python:

# Get the number of users
n = int(input())

# Create an empty dictionary to store the usernames and their frequencies
users = {}

# Loop over the users
for i in range(n):
    # Get the username
    username = input()
    # If the username is already in the dictionary, increment its frequency
    if username in users:
        users[username] += 1
        # Print the new username with its frequency
        print(username + str(users[username]))
    else:
        # Add the username to the dictionary with a frequency of 0
        users[username] = 0
        # Print "OK" since this is a new username
        print("OK")

In this solution, we first get the number of users using int(input()). We then create an empty dictionary called users to store the usernames and their frequencies.

We loop over the users using for i in range(n). For each user, we get their username using input().

If the username is already in the dictionary, we increment its frequency using users[username] += 1. We then print the new username with its frequency using print(username + str(users[username])).

If the username is not in the dictionary, we add it with a frequency of 0 using users[username] = 0. We then print “OK” since this is a new username using print("OK").

Note: This solution assumes that usernames are case-sensitive. If usernames are not case-sensitive, you’ll need to modify the code to account for this.

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