Your browser (Unknown 0) is no longer supported. Some parts of the website may not work correctly. Please update your browser.

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

Find the missing element in a given permutation.

Spoken language:

An array A consisting of N different integers is given. The array contains integers in the range [1..(N + 1)], which means that exactly one element is missing.

Your goal is to find that missing element.

Write a function:

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

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

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

An array A consisting of N different integers is given. The array contains integers in the range [1..(N + 1)], which means that exactly one element is missing.

Your goal is to find that missing element.

Write a function:

int solution(vector<int> &A);

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

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

An array A consisting of N different integers is given. The array contains integers in the range [1..(N + 1)], which means that exactly one element is missing.

Your goal is to find that missing element.

Write a function:

int solution(vector<int> &A);

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

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

Your goal is to find that missing element.

Write a function:

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

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

int solution(List<int> A);

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

func Solution(A []int) int

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

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

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

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

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

function solution(A);

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

fun solution(A: IntArray): Int

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

function solution(A)

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

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.

Your goal is to find that missing element.

Write a function:

int solution(NSMutableArray *A);

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

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

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

function solution($A);

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

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

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

def solution(A)

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

def solution(a)

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

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

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

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

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

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

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].

Your goal is to find that missing element.

Write a function:

Private Function solution(A As Integer()) As Integer

that, given an array A, returns the value of the missing element.

For example, given array A such that:

the function should return 4, as it is the missing element.

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

- N is an integer within the range [0..100,000];
- the elements of A are all distinct;
- each element of array A is an integer within the range [1..(N + 1)].