Valid Polynomial Evaluator – Detailed vs One Liner Version #Python #Eval #Regex #Polynomial

For Detailed Version:

In this challenge, you are given a polynomial expression as a string along with two integers, x and y. Your task is to evaluate the polynomial for the given x and verify if it equals y. A valid polynomial expression could include standard arithmetic operators and the variable x. This problem is an excellent opportunity to explore dynamic expression evaluation in Python using the eval() function.

Step-by-Step Explanation:

Input Handling (#InputHandling, #DataProcessing):

The first line contains two space-separated integers, x and y, where x is the value at which the polynomial is to be evaluated and y is the expected result.

The second line contains the polynomial expression as a string. Make sure to remove any extra whitespace using the strip() method.

Evaluation Using eval() (#Eval, #DynamicExecution):

Python's eval() function is used to compute the value of the polynomial expression.

Since the polynomial contains the variable x, and x is defined in our code, eval() uses the current value of x to evaluate the expression.

Verification and Output (#OutputFormatting):

The evaluated result is compared with y.

If the result equals y, "True" is printed; otherwise, "False" is printed.

Python Version:

Although this challenge was originally intended for Python 2, we have updated the solution to be compatible with Python 3 by using input() and print() with parentheses.

This detailed solution demonstrates how to dynamically evaluate and verify expressions using eval(), which is a powerful tool for executing Python code stored as strings.

Code (Detailed Version):

def solve():
# Read the values for x and y from input
x, y = map(int, input().split())

# Read the polynomial expression as a string and remove any leading/trailing whitespace
poly = input().strip()

# Evaluate the polynomial using the current value of x
result = eval(poly)

# Compare the evaluated result with y and print "True" if they match, else "False"
if result == y:
print("True")
else:
print("False")

if __name__ == '__main__':
solve()

For One-Liner Solution:

This one-liner solution provides a compact approach to evaluate a polynomial expression and verify its result. In this version, the solution:

Reads the integers x and y from input.

Reads the polynomial expression as a string.

Uses eval() to evaluate the polynomial with the given x.

Prints "True" if the evaluated result equals y, otherwise prints "False".

This concise solution is perfect for competitive programming and interviews where brevity is valued, while still effectively demonstrating dynamic expression evaluation using Python's eval() function.

Code (One-Liner Version):

def solve():
x, y = map(int, input().split()); poly = input().strip(); print("True" if eval(poly) == y else "False")
if __name__ == '__main__':
solve()