Python Solution for Codeforces Problem 339A - Helpful Maths

Introduction

Codeforces, renowned for its algorithmic challenges, offers diverse problems that test programming prowess. Codeforces problem 339A - Helpful Maths, introduces an engaging exercise involving mathematical expressions. In this article, we'll explore an optimized Python solution for the problem, unraveling the code's intricacies, and highlighting the value of Codeforces in honing coding skills.

Codeforces Problem 339A - Helpful Maths

Codeforces problem 339A, aptly titled "Helpful Maths," immerses participants in the realm of mathematical expressions. The problem tasks programmers with transforming an input expression by arranging the numbers and addition signs in a specific order.

Python Solution for Problem 339A - Helpful Maths

s = input()
n1 = n2 = n3 = 0
for i in range(0, len(s), 2):
    if s[i] == '1':
        n1 += 1
    elif s[i] == '2':
        n2 += 1
    else:
        n3 += 1

ss = "1+" * n1 + "2+" * n2 + "3+" * n3
print(ss[:-1])

Explanation of the Python Code

1. Input Acquisition: The code begins by reading an input string `s`.

2. Counting Digits: Three variables, `n1`, `n2`, and `n3`, are initialized to keep track of the count of each digit (1, 2, and 3) in the input string.

3. Loop and Counting Logic: A loop iterates through the characters of the input string, considering every second character (since the input format alternates between digits and '+' signs). Within the loop, the code increments the corresponding count variables (`n1`, `n2`, or `n3`) based on the encountered digit.

4. Constructing New Expression: The code constructs a new expression `ss` by concatenating the desired number of each digit followed by a '+' sign. This is achieved using string multiplication and concatenation.

5. Output Display: The final expression `ss` is printed, omitting the trailing '+' sign using slicing (`[:-1]`).

Conclusion

Competitive programming thrives on cultivating problem-solving finesse, as demonstrated by Codeforces problem 339A - Helpful Maths. The Python solution analyzed above empowers programmers to ingeniously manipulate mathematical expressions. This coding endeavor underscores the significance of loops, conditions, and string manipulation in problem-solving.

Platforms like Codeforces provide an optimal arena to nurture problem-solving skills, refine coding efficiency, and participate in captivating coding contests. This article serves as a guide, illuminating the intricacies of the Helpful Maths problem and paving the way to mastering similar algorithmic enigmas.

Embark on the captivating journey of competitive programming, equipped with a comprehensive grasp of core concepts. This expertise empowers you to elegantly tackle coding challenges, fostering a continuous cycle of improvement and exploration. Happy coding and problem-solving!