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AVAILABLE LESSONS:

Lesson 1

Iterations

Lesson 2

Arrays

Lesson 3

Time Complexity

Lesson 4

Counting Elements

Lesson 5

Prefix Sums

Lesson 6

Sorting

Lesson 7

Stacks and Queues

Lesson 8

Leader

Lesson 9

Maximum slice problem

Lesson 10

Prime and composite numbers

Lesson 11

Sieve of Eratosthenes

Lesson 12

Euclidean algorithm

Lesson 13

Fibonacci numbers

Lesson 14

Binary search algorithm

Lesson 15

Caterpillar method

Lesson 16

Greedy algorithms

Lesson 17

Dynamic programming

Lesson 99

Future training

Spoken language:

You are going to build a stone wall. The wall should be straight and N meters long, and its thickness should be constant; however, it should have different heights in different places. The height of the wall is specified by an array H of N positive integers. H[I] is the height of the wall from I to I+1 meters to the right of its left end. In particular, H[0] is the height of the wall's left end and H[N−1] is the height of the wall's right end.

The wall should be built of cuboid stone blocks (that is, all sides of such blocks are rectangular). Your task is to compute the minimum number of blocks needed to build the wall.

Write a function:

int solution(int H[], int N);

that, given an array H of N positive integers specifying the height of the wall, returns the minimum number of blocks needed to build it.

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Copyright 2009–2023 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.

You are going to build a stone wall. The wall should be straight and N meters long, and its thickness should be constant; however, it should have different heights in different places. The height of the wall is specified by an array H of N positive integers. H[I] is the height of the wall from I to I+1 meters to the right of its left end. In particular, H[0] is the height of the wall's left end and H[N−1] is the height of the wall's right end.

The wall should be built of cuboid stone blocks (that is, all sides of such blocks are rectangular). Your task is to compute the minimum number of blocks needed to build the wall.

Write a function:

int solution(vector<int> &H);

that, given an array H of N positive integers specifying the height of the wall, returns the minimum number of blocks needed to build it.

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Copyright 2009–2023 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.

You are going to build a stone wall. The wall should be straight and N meters long, and its thickness should be constant; however, it should have different heights in different places. The height of the wall is specified by an array H of N positive integers. H[I] is the height of the wall from I to I+1 meters to the right of its left end. In particular, H[0] is the height of the wall's left end and H[N−1] is the height of the wall's right end.

The wall should be built of cuboid stone blocks (that is, all sides of such blocks are rectangular). Your task is to compute the minimum number of blocks needed to build the wall.

Write a function:

int solution(vector<int> &H);

that, given an array H of N positive integers specifying the height of the wall, returns the minimum number of blocks needed to build it.

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Copyright 2009–2023 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.

Write a function:

class Solution { public int solution(int[] H); }

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

int solution(List<int> H);

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

func Solution(H []int) int

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

class Solution { public int solution(int[] H); }

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

class Solution { public int solution(int[] H); }

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

function solution(H);

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

fun solution(H: IntArray): Int

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

function solution(H)

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Note: All arrays in this task are zero-indexed, unlike the common Lua convention. You can use `#A` to get the length of the array A.

Write a function:

int solution(NSMutableArray *H);

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

function solution(H: array of longint; N: longint): longint;

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

function solution($H);

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

sub solution { my (@H) = @_; ... }

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

def solution(H)

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

def solution(h)

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

object Solution { def solution(h: Array[Int]): Int }

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

public func solution(_ H : inout [Int]) -> Int

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

function solution(H: number[]): number;

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].

Write a function:

Private Function solution(H As Integer()) As Integer

For example, given array H containing N = 9 integers:

the function should return 7. The figure shows one possible arrangement of seven blocks.

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- each element of array H is an integer within the range [1..1,000,000,000].