Codechef Program Solutions

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4 min readNov 4, 2021

Alternating subarray prefix Codechef Solution|Problem Code: ALTARAY

There's an array A consisting of N non-zero integers A1..N. A subarray of A is called alternating if any two adjacent…

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Alphabet Rangoli in Python - HackerRank Solution

You are given an integer, N. Your task is to print an alphabet rangoli of size N. (Rangoli is a form of Indian folk art…

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Akhil And Colored Balls Codechef Solution|Problem Code: ACBALL

Akhil has many balls of white and black colors. One day, he was playing with them. During the play, he arranged the…

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Airline Restrictions Codechef Solution|Problem Code: AIRLINE

Chef has 33 bags that she wants to take on a flight. They weigh AA, BB, and CC kgs respectively. She wants to check-in…

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African Cities SQL - Hacker Rank Solution

Given the CITY and COUNTRY tables, query the names of all cities where the CONTINENT is 'Africa'. Note…

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Add Two Numbers Codechef Solution

Shivam is the youngest programmer in the world, he is just 12 years old. Shivam is learning programming and today he is…

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Ada School Codechef Solution|Problem Code: ADASCOOL

Ada's classroom contains N⋅MN⋅M tables distributed in a grid with NN rows and MM columns. Each table is occupied by…

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Ada King Codechef Solution|Problem Code: ADAKNG

Chef Ada is training to defend her title of World Chess Champion. To train her calculation skills, Ada placed a king on…

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Ada and the Staircase Codechef Solution|Problem Code: ADASTAIR

There is a big staircase with NN steps (numbered 11 through NN) in ChefLand. Let's denote the height of the top of step…

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Ada and Dishes Codechef Solution|Problem Code: ACBALL

Chef Ada is preparing NN dishes (numbered 11 through NN). For each valid ii, it takes CiCi minutes to prepare the ii-th…

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Ada and crayons Codechef Solution|Problem Code: ADACRA

Ada has an array of N crayons, some crayons are pointing upwards and some downwards. Ada thinks that an array of…

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Accessing Inherited Functions in C++ - Hacker Rank Solution

You are given three classes A, B and C. All three classes implement their own version of func.

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Abstract Classes - Polymorphism in C++ - Hacker Rank Solution

Abstract base classes in C++ can only be used as base classes. Thus, they are allowed to have virtual member functions…

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A Big Sale Codechef Solution|Problem Code: BIGSALE

Chef recently opened a big e-commerce website where her recipes can be bought online. It's Chef's birthday month and so…

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A - Books Codechef Solution

You are given a sortedsorted list AA of size NN.You have to make a new list BB such that B[i]B[i] is equal to the…

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1D Arrays in C - Hacker Rank Solution

An array is a container object that holds a fixed number of values of a single type. To create an array in C, we can do…

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15 Days of Learning SQL - Hacker Rank Solution

Julia conducted a days of learning SQL contest. The start date of the contest was March 01, 2016 and the end date was…

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1 - Cakezoned Codechef Solution|Problem Code: BENDSP2

1 - Cakezoned Codechef Solution|Problem Code: BENDSP2www.codeworld19.com

Ambiguous Permutations Codechef Solution

Some programming contest problems are really tricky: not only do they require a different output format from what you…

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AND Plus OR Codechef Solution|Problem Code: ANDOR

Given an integer x, find two non-negative integers a and b such that (a∧b)+(a∨b)=x(a∧b)+(a∨b)=x, where ∧ is the bitwise…

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Andrew and the Meatballs again Codechef Solution|Problem Code:AMMEAT2

Andrew likes meatballs very much as you know. He has N plates of meatballs, here the ith plate contains exactly i…

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Andrew and the Meatballs Codechef Solution|Problem Code:AMMEAT

Andrew likes meatballs very much. He has N plates of meatballs, here the i th plate contains meatballs. You need to…

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Any or All in python - HackerRank Solution

This expression returns True if any element of the iterable is true.If the iterable is empty, it will return False…

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Approximately Codechef Solution|Problem Code: APPROX

Chef has recently learnt some new facts about the famous number π. For example, he was surprised that ordinary…

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Arithmetic Operators in Python - HackerRank Solution

Task The provided code stub reads two integers from STDIN, a and b. Add code to print three lines where: The first line…

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Area OR Perimeter Codechef Solution|Problem Code: AREAPERI

Write a program to obtain length (L) and breadth (B) of a rectangle and check whether its area is greater or perimeter…

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Arranging the Appetizers Codechef Solution|Problem Code: ARRANGE

The Chef has prepared the appetizers in the shapes of letters to spell a special message for the guests. There are n…

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Array Reversal in C - Hacker Rank Solution

Given an array, of size n , reverse it.Example: If array, arr = [1,2,3,4,5], after reversing it, the array should be…

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Array Rotation Codechef Solution|Problem Code: COF1MED1

Array Rotation Codechef Solution|Problem Code: COF1MED1 -

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Arrays in Python - HackerRank Solution

The NumPy (Numeric Python) package helps us manipulate large arrays and matrices of numeric data.To use the NumPy…

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Arrays Introduction in C++ - Hacker Rank Solution

An array is a series of elements of the same type placed in contiguous memory locations that can be individually…

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Athlete Sort in python - HackerRank Solution

You are given a spreadsheet that contains a list of N athletes and their details (such as age, height, weight and so…

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ATM Machine Codechef Solution|Problem Code: ATM2

There is an ATM machine. Initially, it contains a total of K units of money. N people (numbered 11 through NN) want to…

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Attendance Codechef Solution|Problem Code: ATTND

Chef is teaching a cooking course. There are N students attending the course, numbered 1 through N. Before each lesson…

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Codechef Program Solutions

Alternating subarray prefix Codechef Solution|Problem Code: ALTARAY

There's an array A consisting of N non-zero integers A1..N. A subarray of A is called alternating if any two adjacent…

Alphabet Rangoli in Python - HackerRank Solution

You are given an integer, N. Your task is to print an alphabet rangoli of size N. (Rangoli is a form of Indian folk art…

Akhil And Colored Balls Codechef Solution|Problem Code: ACBALL

Akhil has many balls of white and black colors. One day, he was playing with them. During the play, he arranged the…

Airline Restrictions Codechef Solution|Problem Code: AIRLINE

Chef has 33 bags that she wants to take on a flight. They weigh AA, BB, and CC kgs respectively. She wants to check-in…

African Cities SQL - Hacker Rank Solution

Given the CITY and COUNTRY tables, query the names of all cities where the CONTINENT is 'Africa'. Note…

Add Two Numbers Codechef Solution

Shivam is the youngest programmer in the world, he is just 12 years old. Shivam is learning programming and today he is…

Ada School Codechef Solution|Problem Code: ADASCOOL

Ada's classroom contains N⋅MN⋅M tables distributed in a grid with NN rows and MM columns. Each table is occupied by…

Ada King Codechef Solution|Problem Code: ADAKNG

Chef Ada is training to defend her title of World Chess Champion. To train her calculation skills, Ada placed a king on…

Ada and the Staircase Codechef Solution|Problem Code: ADASTAIR

There is a big staircase with NN steps (numbered 11 through NN) in ChefLand. Let's denote the height of the top of step…

Ada and Dishes Codechef Solution|Problem Code: ACBALL

Chef Ada is preparing NN dishes (numbered 11 through NN). For each valid ii, it takes CiCi minutes to prepare the ii-th…

Ada and crayons Codechef Solution|Problem Code: ADACRA

Ada has an array of N crayons, some crayons are pointing upwards and some downwards. Ada thinks that an array of…

Accessing Inherited Functions in C++ - Hacker Rank Solution

You are given three classes A, B and C. All three classes implement their own version of func.

Abstract Classes - Polymorphism in C++ - Hacker Rank Solution

Abstract base classes in C++ can only be used as base classes. Thus, they are allowed to have virtual member functions…

A Big Sale Codechef Solution|Problem Code: BIGSALE

Chef recently opened a big e-commerce website where her recipes can be bought online. It's Chef's birthday month and so…

A - Books Codechef Solution

You are given a sortedsorted list AA of size NN.You have to make a new list BB such that B[i]B[i] is equal to the…

1D Arrays in C - Hacker Rank Solution

An array is a container object that holds a fixed number of values of a single type. To create an array in C, we can do…

15 Days of Learning SQL - Hacker Rank Solution

Julia conducted a days of learning SQL contest. The start date of the contest was March 01, 2016 and the end date was…

1 - Cakezoned Codechef Solution|Problem Code: BENDSP2

1 - Cakezoned Codechef Solution|Problem Code: BENDSP2

Ambiguous Permutations Codechef Solution

Some programming contest problems are really tricky: not only do they require a different output format from what you…

AND Plus OR Codechef Solution|Problem Code: ANDOR

Given an integer x, find two non-negative integers a and b such that (a∧b)+(a∨b)=x(a∧b)+(a∨b)=x, where ∧ is the bitwise…

Andrew and the Meatballs again Codechef Solution|Problem Code:AMMEAT2

Andrew likes meatballs very much as you know. He has N plates of meatballs, here the ith plate contains exactly i…

Andrew and the Meatballs Codechef Solution|Problem Code:AMMEAT

Andrew likes meatballs very much. He has N plates of meatballs, here the i th plate contains meatballs. You need to…

Any or All in python - HackerRank Solution

This expression returns True if any element of the iterable is true.If the iterable is empty, it will return False…

Approximately Codechef Solution|Problem Code: APPROX

Chef has recently learnt some new facts about the famous number π. For example, he was surprised that ordinary…

Arithmetic Operators in Python - HackerRank Solution

Task The provided code stub reads two integers from STDIN, a and b. Add code to print three lines where: The first line…

Area OR Perimeter Codechef Solution|Problem Code: AREAPERI

Write a program to obtain length (L) and breadth (B) of a rectangle and check whether its area is greater or perimeter…

Arranging the Appetizers Codechef Solution|Problem Code: ARRANGE

The Chef has prepared the appetizers in the shapes of letters to spell a special message for the guests. There are n…

Array Reversal in C - Hacker Rank Solution

Given an array, of size n , reverse it.Example: If array, arr = [1,2,3,4,5], after reversing it, the array should be…

Array Rotation Codechef Solution|Problem Code: COF1MED1

Array Rotation Codechef Solution|Problem Code: COF1MED1 -

Arrays in Python - HackerRank Solution

The NumPy (Numeric Python) package helps us manipulate large arrays and matrices of numeric data.To use the NumPy…

Arrays Introduction in C++ - Hacker Rank Solution

An array is a series of elements of the same type placed in contiguous memory locations that can be individually…

Athlete Sort in python - HackerRank Solution

You are given a spreadsheet that contains a list of N athletes and their details (such as age, height, weight and so…

ATM Machine Codechef Solution|Problem Code: ATM2

There is an ATM machine. Initially, it contains a total of K units of money. N people (numbered 11 through NN) want to…

Attendance Codechef Solution|Problem Code: ATTND

Chef is teaching a cooking course. There are N students attending the course, numbered 1 through N. Before each lesson…

Attending Workshops in C++ - Hacker Rank Solution

A student signed up for n workshops and wants to attend the maximum number of workshops where no two workshops overlap…

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