Coding Interview Questions — Day 2 (with Python Solutions)

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 Coding Interview Questions — Day 2 (with Python Solutions)

Introduction

Welcome back to Day 2 of the Coding Interview Challenge Series!
In this post, we’ll continue sharpening your coding skills with 15 new coding questions that test logic, data structures, and problem-solving speed.

Top 15 Coding Interview Questions (Day 2)

Question 1: Check for Prime Number

def is_prime(n):
    if n < 2:
        return False
    for i in range(2, int(n**0.5) + 1):
        if n % i == 0:
            return False
    return True

Question 2: Find Factorial of a Number (Recursive)

def factorial(n):
    return 1 if n == 0 else n * factorial(n - 1)

Question 3: Check for Palindrome String

def is_palindrome(s):
    return s == s[::-1]

Question 4: Find Maximum Element in a List

def find_max(lst):
    max_val = lst[0]
    for num in lst:
        if num > max_val:
            max_val = num
    return max_val

Question 5: Count Vowels in a String

def count_vowels(s):
    vowels = "aeiouAEIOU"
    return sum(1 for ch in s if ch in vowels)

Question 6: Find Second Largest Element

def second_largest(lst):
    unique = list(set(lst))
    unique.sort()
    return unique[-2]

Question 7: Reverse Words in a Sentence

def reverse_words(sentence):
    return ' '.join(sentence.split()[::-1])

Question 8: Find Missing Number in Sequence

def missing_number(nums):
    n = len(nums) + 1
    total = n * (n + 1) // 2
    return total - sum(nums)

Question 9: Check for Armstrong Number

def is_armstrong(n):
    digits = str(n)
    power = len(digits)
    return n == sum(int(d)**power for d in digits)

Question 10: Remove Duplicates from a List

def remove_duplicates(lst):
    return list(set(lst))

Question 11: Find Intersection of Two Lists

def list_intersection(a, b):
    return list(set(a) & set(b))

Question 12: Count Frequency of Elements in a List

def frequency_count(lst):
    freq = {}
    for item in lst:
        freq[item] = freq.get(item, 0) + 1
    return freq

Question 13: Sum of Digits of a Number

def sum_of_digits(n):
    return sum(int(d) for d in str(n))

Question 14: Check Anagram Strings

def is_anagram(s1, s2):
    return sorted(s1) == sorted(s2)

Question 15: Find Common Elements in Three Lists

def common_elements(a, b, c):
    return list(set(a) & set(b) & set(c))

Summary

You’ve now completed Day 2 of the Coding Interview Challenge series!
 * Covered 15 must-practice problems
 * Strengthened logic and pattern recognition
 * Built confidence with hands-on Python solutions

Keep practicing daily...


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