Finding the Sum of Digits of a Number Until Zero
Difficulty: Easy
Topics: Basic Programming, Mathematical Computations
Description: Write a program to repeatedly sum the digits of a number until the result is zero.
Example:
Input: number = 123
Output: 6
Explanation: Sum of digits is 1 + 2 + 3 = 6; sum of digits of 6 is 6 (which is a single digit).
Generating a Multiplication Table for a Range
Difficulty: Easy
Topics: Arrays, Basic Programming
Description: Write a program to generate multiplication tables for numbers within a specified range.
Example:
Input: start = 2, end = 4
Output:
2 x 1 = 2 3 x 1 = 3 4 x 1 = 4
2 x 2 = 4 3 x 2 = 6 4 x 2 = 8
2 x 3 = 6 3 x 3 = 9 4 x 3 = 12
2 x 4 = 8 3 x 4 = 12 4 x 4 = 16
Calculating the Sum of a Series (1 + 1/2 + 1/3 + ... + 1/n)
Difficulty: Medium
Topics: Mathematical Computations
Description: Write a program to calculate the sum of the series 1 + 1/2 + 1/3 + ... + 1/n up to the nth term.
Example:
Input: n = 4
Output: 2.083333
Explanation: Sum of the series is 1 + 1/2 + 1/3 + 1/4 ≈ 2.083333.
Finding All Pairs of Elements in an Array that Add Up to a Given Sum
Difficulty: Medium
Topics: Arrays, Hashing
Description: Write a program to find all pairs of elements in an array whose sum equals a specified target.
Example:
Input: array = [1, 2, 3, 4, 5], target = 5
Output: [(1, 4), (2, 3)]
Explanation: Pairs that sum up to 5 are (1, 4) and (2, 3).
Generating a Diamond Pattern of Stars
Difficulty: Medium
Topics: Patterns, Basic Programming
Description: Write a program to create a diamond pattern with stars of a given size.
Example:
Input: size = 5
Output:
*
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*****
***
*
Counting the Number of Palindromic Substrings in a String
Difficulty: Medium
Topics: String Manipulation
Description: Write a program to count how many palindromic substrings exist in a given string.
Example:
Input: string = "aaa"
Output: 6
Explanation: Palindromic substrings are "a", "a", "a", "aa", "aa", "aaa".
Generating a Matrix with Multiplication Table
Difficulty: Easy
Topics: Arrays, Matrix Operations
Description: Write a program to generate a matrix where each element at position (i, j) is the product of i and j.
Example:
Input: size = 3
Output:
1 2 3
2 4 6
3 6 9
Finding the GCD of Multiple Numbers
Difficulty: Medium
Topics: Mathematical Computations
Description: Write a program to find the GCD (Greatest Common Divisor) of an array of numbers.
Example:
Input: array = [12, 24, 36]
Output: 12
Explanation: The GCD of 12, 24, and 36 is 12.
Finding the Sum of the First N Odd Numbers
Difficulty: Easy
Topics: Mathematical Computations
Description: Write a program to calculate the sum of the first N odd numbers.
Example:
Input: N = 5
Output: 25
Explanation: Sum of the first 5 odd numbers (1 + 3 + 5 + 7 + 9) is 25.
Finding the Number of Perfect Numbers Up to a Given Limit
Difficulty: Medium
Topics: Number Theory
Description: Write a program to find how many perfect numbers exist up to a given limit.
Example:
Input: limit = 30
Output: 1
Explanation: There is only one perfect number (6) up to 30.
Finding the Largest Prime Factor of a Number
Difficulty: Medium
Topics: Number Theory
Description: Write a program to find the largest prime factor of a given number.
Example:
Input: number = 28
Output: 7
Explanation: The prime factors of 28 are 2 and 7, with the largest being 7.
Generating a Matrix of Fibonacci Numbers
Difficulty: Medium
Topics: Arrays, Matrix Operations
Description: Write a program to generate a matrix where each element is a Fibonacci number.
Example:
Input: size = 3
Output:
1 1 2
3 5 8
13 21 34
Finding the Sum of the First N Prime Numbers
Difficulty: Medium
Topics: Prime Numbers, Mathematical Computations
Description: Write a program to calculate the sum of the first N prime numbers.
Example:
Input: N = 4
Output: 17
Explanation: The sum of the first 4 prime numbers (2 + 3 + 5 + 7) is 17.
Checking for a Balanced Bracket Sequence
Difficulty: Medium
Topics: String Manipulation, Stack
Description: Write a program to check if a given string with brackets is balanced.
Example:
Input: string = "{[()]}"
Output: True
Explanation: The brackets are balanced.
Finding the Sum of Numbers in a String
Difficulty: Easy
Topics: String Manipulation
Description: Write a program to extract and sum all numbers present in a given string.
Example:
Input: string = "The numbers are 12 and 34"
Output: 46
Explanation: The sum of numbers 12 and 34 is 46.
Finding the Longest Consecutive Sequence in an Array
Difficulty: Medium
Topics: Arrays, Hashing
Description: Write a program to find the longest sequence of consecutive numbers in an array.
Example:
Input: array = [100, 4, 200, 1, 3, 2]
Output: 4
Explanation: The longest consecutive sequence is [1, 2, 3, 4].
Generating a Matrix with a Spiral Pattern
Difficulty: Medium
Topics: Arrays, Matrix Operations
Description: Write a program to generate a matrix filled with numbers in a spiral pattern.
Example:
Input: size = 3
Output:
1 2 3
8 9 4
7 6 5
Finding All Subsets of a Set
Difficulty: Medium
Topics: Combinatorics
Description: Write a program to generate all possible subsets of a given set of numbers.
Example:
Input: set = [1, 2]
Output: [[], [1], [2], [1, 2]]
Explanation: The subsets of [1, 2] are the empty set, [1], [2], and [1, 2].
Checking for Perfect Squares in a Range
Difficulty: Easy
Topics: Mathematical Comput
ations
Description: Write a program to check which numbers in a given range are perfect squares.
Example:
Input: start = 1, end = 10
Output: [1, 4, 9]
Explanation: Perfect squares between 1 and 10 are 1, 4, and 9.
Finding the Sum of Diagonal Elements in a Matrix
Difficulty: Easy
Topics: Matrix Operations
Description: Write a program to calculate the sum of the diagonal elements in a square matrix.
Example:
Input: matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
Output: 15
Explanation: The sum of the diagonal elements (1 + 5 + 9) is 15.
Finding the Second Smallest Number in an Array
Difficulty: Easy
Topics: Arrays
Description: Write a program to find the second smallest number in an array.
Example:
Input: array = [12, 13, 1, 10, 34, 1]
Output: 10
Explanation: The second smallest number in the array is 10.
Generating Pascal’s Triangle Up to N Rows
Difficulty: Medium
Topics: Combinatorics
Description: Write a program to generate Pascal’s Triangle up to N rows.
Example:
Input: N = 3
Output:
1
1 1
1 2 1
Finding the Sum of Digits of the Product of Two Numbers
Difficulty: Easy
Topics: Mathematical Computations
Description: Write a program to find the sum of the digits of the product of two given numbers.
Example:
Input: number1 = 12, number2 = 34
Output: 9
Explanation: The product of 12 and 34 is 408, and the sum of its digits is 4 + 0 + 8 = 12.
Checking for Palindromic Numbers in a Range
Difficulty: Medium
Topics: Mathematical Computations
Description: Write a program to check for palindromic numbers within a given range.
Example:
Input: start = 1, end = 100
Output: [1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99]
Explanation: Palindromic numbers between 1 and 100 are the numbers listed.
Generating a Matrix with Alternating 0s and 1s
Difficulty: Easy
Topics: Arrays, Matrix Operations
Description: Write a program to generate a matrix where the elements alternate between 0 and 1.
Example:
Input: size = 3
Output:
0 1 0
1 0 1
0 1 0
Finding the Count of a Specific Word in a String
Difficulty: Easy
Topics: String Manipulation
Description: Write a program to count how many times a specific word appears in a given string.
Example:
Input: string = "hello world hello"
Output: 2
Explanation: The word "hello" appears 2 times in the string.
Finding the Largest Sum of a Subarray
Difficulty: Medium
Topics: Arrays, Dynamic Programming
Description: Write a program to find the largest sum of any contiguous subarray.
Example:
Input: array = [-2, 1, -3, 4, -1, 2, 1, -5, 4]
Output: 6
Explanation: The largest sum is 6, from the subarray [4, -1, 2, 1].
Generating a Right-Angle Triangle Pattern of Numbers
Difficulty: Easy
Topics: Patterns
Description: Write a program to create a right-angle triangle pattern with numbers.
Example:
Input: height = 4
Output:
1
12
123
1234
Finding All Divisors of the Product of Two Numbers
Difficulty: Medium
Topics: Number Theory
Description: Write a program to find all divisors of the product of two given numbers.
Example:
Input: number1 = 6, number2 = 10
Output: [1, 2, 3, 5, 6, 10, 15, 30]
Explanation: The product of 6 and 10 is 60, and its divisors are listed.
Finding the Longest Sequence of Consecutive 1s in a Binary Array
Difficulty: Medium
Topics: Arrays, Binary Operations
Description: Write a program to find the longest sequence of consecutive 1s in a binary array.
Example:
Input: array = [1, 1, 0, 1, 1, 1]
Output: 3
Explanation: The longest sequence of 1s is [1, 1, 1] with length 3.
Calculating the Sum of the First N Fibonacci Numbers
Difficulty: Medium
Topics: Fibonacci Sequence, Mathematical Computations
Description: Write a program to calculate the sum of the first N Fibonacci numbers.
Example:
Input: N = 5
Output: 12
Explanation: The first 5 Fibonacci numbers are 1, 1, 2, 3, 5, and their sum is 12.
Checking for a Repeated Substring in a String
Difficulty: Medium
Topics: String Manipulation
Description: Write a program to check if a substring is repeated within a given string.
Example:
Input: string = "abab"
Output: True
Explanation: The substring "ab" is repeated.
Finding the Median of a List of Numbers
Difficulty: Medium
Topics: Sorting, Mathematical Computations
Description: Write a program to find the median value of a list of numbers.
Example:
Input: list = [3, 1, 4, 1, 5]
Output: 3
Explanation: After sorting the list to [1, 1, 3, 4, 5], the median is 3.
Finding the Number of Words in a String
Difficulty: Easy
Topics: String Manipulation
Description: Write a program to count the number of words in a given string.
Example:
Input: string = "Hello world"
Output: 2
Explanation: There are 2 words in the string.
Generating a Matrix with a Diagonal Pattern
Difficulty: Medium
Topics: Matrix Operations
Description: Write a program to create a matrix where elements form diagonal lines of a given pattern.
Example:
Input: size = 4
Output:
1 0 0 0
1 1 0 0
1 1 1 0
1 1 1 1
Finding the Sum of the First N Even Numbers
Difficulty: Easy
Topics: Mathematical Computations
Description: Write a program to calculate the sum of the first N even numbers.
Example:
Input: N = 4
Output: 20
Explanation: The first 4 even numbers are 2, 4, 6, 8, and their sum is 20.
Finding the Count of Digits Greater Than a Specific Value
Difficulty: Easy
Topics: Mathematical Computations
Description: Write a program to count how many digits in a number are greater than a specific value.
Example:
Input: number = 54321, value = 3
Output: 2
Explanation: The digits
greater than 3 in 54321 are 5, 4, and 4, so the count is 2.
Generating a Pattern of Prime Numbers
Difficulty: Medium
Topics: Prime Numbers, Patterns
Description: Write a program to generate a pattern where each row contains the first few prime numbers.
Example:
Input: rows = 3
Output:
2
2 3
2 3 5
Finding the Common Elements in Two Arrays
Difficulty: Medium
Topics: Arrays
Description: Write a program to find common elements between two arrays.
Example:
Input: array1 = [1, 2, 3, 4], array2 = [3, 4, 5, 6]
Output: [3, 4]
Explanation: The common elements between the two arrays are 3 and 4.
Finding the Sum of the Squares of All Even Numbers Up to N
Difficulty: Medium
Topics: Mathematical Computations
Description: Write a program to calculate the sum of squares of all even numbers up to a given N.
Example:
Input: N = 4
Output: 20
Explanation: The even numbers up to 4 are 2 and 4, and their squares are 4 and 16. The sum is 20.
Generating a Pattern of Increasing Numbers
Difficulty: Easy
Topics: Patterns
Description: Write a program to create a pattern where numbers increase with each row.
Example:
Input: rows = 3
Output:
1
12
123
Finding the Largest Element in Each Row of a Matrix
Difficulty: Easy
Topics: Matrix Operations
Description: Write a program to find the largest element in each row of a matrix.
Example:
Input: matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
Output: [3, 6, 9]
Explanation: The largest elements in each row are 3, 6, and 9.
Checking for Anagram Pairs in a List of Strings
Difficulty: Medium
Topics: String Manipulation
Description: Write a program to find pairs of strings in a list that are anagrams of each other.
Example:
Input: strings = ["listen", "silent", "hello", "world"]
Output: [("listen", "silent")]
Explanation: "listen" and "silent" are anagrams.
Finding the Frequency of Each Character in a String
Difficulty: Easy
Topics: String Manipulation
Description: Write a program to count the frequency of each character in a given string.
Example:
Input: string = "hello"
Output: {'h': 1, 'e': 1, 'l': 2, 'o': 1}
Explanation: The frequency of each character in the string "hello" is shown.
Generating a Matrix with Random Numbers
Difficulty: Easy
Topics: Random Number Generation, Matrix Operations
Description: Write a program to generate a matrix filled with random numbers.
Example:
Input: rows = 2, columns = 3
Output:
3 8 1
7 4 6
Finding the Length of the Longest Word in a String
Difficulty: Easy
Topics: String Manipulation
Description: Write a program to find the length of the longest word in a given string.
Example:
Input: string = "Find the longest word"
Output: 8
Explanation: The longest word is "longest" with length 8.
Finding All Triplets in an Array That Sum to Zero
Difficulty: Medium
Topics: Arrays, Sorting
Description: Write a program to find all unique triplets in an array that sum to zero.
Example:
Input: array = [-1, 0, 1, 2, -1, -4]
Output: [[-1, -1, 2], [-1, 0, 1]]
Explanation: The unique triplets that sum to zero are listed.
Generating a Square Matrix with Random Values
Difficulty: Easy
Topics: Random Number Generation, Matrix Operations
Description: Write a program to generate a square matrix where each element is a random value.
Example:
Input: size = 3
Output:
7 3 5
2 6 9
1 8 4
Finding the Difference Between the Sum of Even and Odd Numbers in an Array
Difficulty: Easy
Topics: Arrays, Mathematical Computations
Description: Write a program to calculate the difference between the sum of even and odd numbers in an array.
Example:
Input: array = [1, 2, 3, 4, 5, 6]
Output: 4
Explanation: The sum of even numbers is 12, and the sum of odd numbers is 8. The difference is 4.
Generating a Triangle Pattern of Stars with a Given Height
Difficulty: Easy
Topics: Patterns
Description: Write a program to create a triangle pattern of stars with a specified height.
Example:
Input: height = 4
Output:
*
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****