Test results - Codility

Tasks Details

easy

1. CyclicRotation

Rotate an array to the right by a given number of steps.

Task Score

100%

Correctness

100%

Performance

Not assessed

An array A consisting of N integers is given. Rotation of the array means that each element is shifted right by one index, and the last element of the array is moved to the first place. For example, the rotation of array A = [3, 8, 9, 7, 6] is [6, 3, 8, 9, 7] (elements are shifted right by one index and 6 is moved to the first place).

The goal is to rotate array A K times; that is, each element of A will be shifted to the right K times.

Write a function:

function solution(A, K);

that, given an array A consisting of N integers and an integer K, returns the array A rotated K times.

For example, given

A = [3, 8, 9, 7, 6] K = 3

the function should return [9, 7, 6, 3, 8]. Three rotations were made:

[3, 8, 9, 7, 6] -> [6, 3, 8, 9, 7] [6, 3, 8, 9, 7] -> [7, 6, 3, 8, 9] [7, 6, 3, 8, 9] -> [9, 7, 6, 3, 8]

For another example, given

A = [0, 0, 0] K = 1

the function should return [0, 0, 0]

Given

A = [1, 2, 3, 4] K = 4

the function should return [1, 2, 3, 4]

Assume that:

N and K are integers within the range [0..100];

each element of array A is an integer within the range [−1,000..1,000].

In your solution, focus on correctness. The performance of your solution will not be the focus of the assessment.

Solution

Programming language used JavaScript

Time spent on task 11 minutes

Notes

not defined yet

Task timeline

Code: 13:59:16 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11

// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int[] solution(int[] A, int K) {
        // write your code in Java SE 8
    }
}

Code: 14:02:01 UTC, js, autosave

show code in pop-up

1 2 3 4 5 6

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // write your code in JavaScript (Node.js 8.9.4)
}

Code: 14:02:08 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    return [...A.slice(times, A.length), ...A.slice(0, times)]
}

Analysis

expand all Example tests

▶

example
first example test

✘

WRONG ANSWER
got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

0.068 s

WRONG ANSWER, got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

▶

example2
second example test

✔

0.068 s

▶

example3
third example test

✔

0.068 s

Code: 14:02:19 UTC, js, autosave

show code in pop-up

1 2 3 4 5 6

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // write your code in JavaScript (Node.js 8.9.4)
}

Code: 14:02:21 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    return [...A.slice(times, A.length), ...A.slice(0, times)]
}

Analysis

expand all Example tests

▶

example
first example test

✘

WRONG ANSWER
got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

0.072 s

WRONG ANSWER, got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

▶

example2
second example test

✔

0.072 s

▶

example3
third example test

✔

0.068 s

Code: 14:02:53 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    return [...A.slice(times, A.length), ...A.slice(0, times)]
}

Analysis

expand all Example tests

▶

example
first example test

✘

WRONG ANSWER
got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

0.072 s

WRONG ANSWER, got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

▶

example2
second example test

✔

0.072 s

▶

example3
third example test

✔

0.072 s

Code: 14:03:34 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    return [...A.slice(times, A.length), ...A.slice(0, times)]
}

Analysis

expand all Example tests

▶

example
first example test

✘

WRONG ANSWER
got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

0.068 s

WRONG ANSWER, got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

▶

example2
second example test

✔

0.068 s

▶

example3
third example test

✔

0.072 s

Code: 14:04:17 UTC, js, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    console.log(A.slice(A.length-times, A.length))
    return [...A.slice(A.length-times, A.length), ...A.slice(0, times)]
}

Code: 14:04:17 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    console.log(A.slice(A.length-times, A.length))
    return [...A.slice(A.length-times, A.length), ...A.slice(0, times)]
}

Analysis

expand all Example tests

▶

example
first example test

✘

WRONG ANSWER
got [9, 7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

0.076 s

WRONG ANSWER, got [9, 7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

stdout:

[ 9, 7, 6 ]

▶

example2
second example test

✘

WRONG ANSWER
got [0, 0] expected [0, 0, 0]

0.076 s

WRONG ANSWER, got [0, 0] expected [0, 0, 0]

stdout:

[ 0 ]

▶

example3
third example test

✘

WRONG ANSWER
got [] expected [1, 2, 3, 4]

0.072 s

WRONG ANSWER, got [] expected [1, 2, 3, 4]

stdout:

[]

Code: 14:04:38 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    return [...A.slice(A.length-times, A.length), ...A.slice(0, times-1)]
}

Analysis

expand all Example tests

▶

example
first example test

✔

0.068 s

▶

example2
second example test

✘

WRONG ANSWER
got [0] expected [0, 0, 0]

0.072 s

WRONG ANSWER, got [0] expected [0, 0, 0]

▶

example3
third example test

✘

WRONG ANSWER
got [1, 2, 3] expected [1, 2, 3, 4]

0.112 s

WRONG ANSWER, got [1, 2, 3] expected [1, 2, 3, 4]

Code: 14:04:58 UTC, js, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    console.log(A.slice(A.length-times, A.length))
    return [...A.slice(A.length-times, A.length), ...A.slice(0, times-1)]
}

Code: 14:04:58 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    console.log(A.slice(A.length-times, A.length))
    return [...A.slice(A.length-times, A.length), ...A.slice(0, times-1)]
}

Analysis

expand all Example tests

▶

example
first example test

✔

0.076 s

stdout:

[ 9, 7, 6 ]

▶

example2
second example test

✘

WRONG ANSWER
got [0] expected [0, 0, 0]

0.076 s

WRONG ANSWER, got [0] expected [0, 0, 0]

stdout:

[ 0 ]

▶

example3
third example test

✘

WRONG ANSWER
got [1, 2, 3] expected [1, 2, 3, 4]

0.076 s

WRONG ANSWER, got [1, 2, 3] expected [1, 2, 3, 4]

stdout:

[]

Code: 14:05:29 UTC, js, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    console.log('??',A.slice(A.length-times, A.length))
    return [...A.slice(A.length-times, A.length), ...A.slice(0, times-1)]
}

Code: 14:05:30 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    console.log('??',A.slice(A.length-times, A.length))
    return [...A.slice(A.length-times, A.length), ...A.slice(0, times-1)]
}

Analysis

expand all Example tests

▶

example
first example test

✔

0.076 s

stdout:

?? [ 9, 7, 6 ]

▶

example2
second example test

✘

WRONG ANSWER
got [0] expected [0, 0, 0]

0.076 s

WRONG ANSWER, got [0] expected [0, 0, 0]

stdout:

?? [ 0 ]

▶

example3
third example test

✘

WRONG ANSWER
got [1, 2, 3] expected [1, 2, 3, 4]

0.076 s

WRONG ANSWER, got [1, 2, 3] expected [1, 2, 3, 4]

stdout:

?? []

Code: 14:05:42 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // 배열의 길이 만큼 움직이면 결국 제자리이므로 나머지 만큼만 돈다.
    const times = K % A.length
    console.log('??',A.length-times, A.length, A.slice(A.length-times, A.length))
    return [...A.slice(A.length-times, A.length), ...A.slice(0, times-1)]
}

Analysis

expand all Example tests

▶

example
first example test

✔

0.076 s

stdout:

?? 2 5 [ 9, 7, 6 ]

▶

example2
second example test

✘

WRONG ANSWER
got [0] expected [0, 0, 0]

0.072 s

WRONG ANSWER, got [0] expected [0, 0, 0]

stdout:

?? 2 3 [ 0 ]

▶

example3
third example test

✘

WRONG ANSWER
got [1, 2, 3] expected [1, 2, 3, 4]

0.072 s

WRONG ANSWER, got [1, 2, 3] expected [1, 2, 3, 4]

stdout:

?? 4 4 []

Code: 14:06:56 UTC, js, autosave

show code in pop-up

1 2 3 4 5 6

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    return [...A.splice(K), ...A.slice(0, K)]
}

Code: 14:06:57 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    return [...A.splice(K), ...A.slice(0, K)]
}

Analysis

expand all Example tests

▶

example
first example test

✘

WRONG ANSWER
got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

0.072 s

WRONG ANSWER, got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

▶

example2
second example test

✔

0.072 s

▶

example3
third example test

✔

0.072 s

Code: 14:07:32 UTC, js, autosave

show code in pop-up

1 2 3 4 5 6 7 8

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    console.log(A.splice(K))
    console.log(A.slice(0, K))
    return [...A.splice(K), ...A.slice(0, K)]
}

Code: 14:07:32 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    console.log(A.splice(K))
    console.log(A.slice(0, K))
    return [...A.splice(K), ...A.slice(0, K)]
}

Analysis

expand all Example tests

▶

example
first example test

✘

WRONG ANSWER
got [3, 8, 9] expected [9, 7, 6, 3, 8]

0.076 s

WRONG ANSWER, got [3, 8, 9] expected [9, 7, 6, 3, 8]

stdout:

[ 7, 6 ]
[ 3, 8, 9 ]

▶

example2
second example test

✘

WRONG ANSWER
got [0] expected [0, 0, 0]

0.076 s

WRONG ANSWER, got [0] expected [0, 0, 0]

stdout:

[ 0, 0 ]
[ 0 ]

▶

example3
third example test

✔

0.076 s

stdout:

[]
[ 1, 2, 3, 4 ]

Code: 14:08:14 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    // console.log(A.splice(K))
    // console.log(A.slice(0, K))
    return A.splice(K).concat(A.slice(0, K))
}

Analysis

expand all Example tests

▶

example
first example test

✘

WRONG ANSWER
got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

0.072 s

WRONG ANSWER, got [7, 6, 3, 8, 9] expected [9, 7, 6, 3, 8]

▶

example2
second example test

✔

0.072 s

▶

example3
third example test

✔

0.072 s

Code: 14:09:56 UTC, js, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    const sliceTimes = K % A.length
  
    if (sliceTimes === 0 || sliceTimes === A.length) {
      return A;
    }
      
    return [...A.slice(A.length - sliceTimes), ...A.slice(0, A.length - sliceTimes)]
}

Code: 14:09:56 UTC, js, verify, result: Passed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    const sliceTimes = K % A.length
  
    if (sliceTimes === 0 || sliceTimes === A.length) {
      return A;
    }
      
    return [...A.slice(A.length - sliceTimes), ...A.slice(0, A.length - sliceTimes)]
}

Analysis

expand all Example tests

▶

example
first example test

✔

0.072 s

▶

example2
second example test

✔

0.072 s

▶

example3
third example test

✔

0.072 s

Code: 14:10:00 UTC, js, verify, result: Passed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    const sliceTimes = K % A.length
  
    if (sliceTimes === 0 || sliceTimes === A.length) {
      return A;
    }
      
    return [...A.slice(A.length - sliceTimes), ...A.slice(0, A.length - sliceTimes)]
}

Analysis

expand all Example tests

▶

example
first example test

✔

0.072 s

▶

example2
second example test

✔

0.072 s

▶

example3
third example test

✔

0.072 s

Code: 14:10:02 UTC, js, final, score: 100

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A, K) {
    const sliceTimes = K % A.length
  
    if (sliceTimes === 0 || sliceTimes === A.length) {
      return A;
    }
      
    return [...A.slice(A.length - sliceTimes), ...A.slice(0, A.length - sliceTimes)]
}

Analysis summary

The solution obtained perfect score.

Analysis

expand all Example tests

▶

example
first example test

✔

0.072 s

▶

example2
second example test

✔

0.072 s

▶

example3
third example test

✔

0.072 s

expand all Correctness tests

▶

extreme_empty
empty array

✔

0.072 s

0.068 s

▶

single
one element, 0 <= K <= 5

✔

0.072 s

▶

double
two elements, K <= N

✔

0.072 s

▶

small1
small functional tests, K < N

✔

0.072 s

▶

small2
small functional tests, K >= N

✔

0.072 s

▶

small_random_all_rotations
small random sequence, all rotations, N = 15

✔

0.068 s

0.072 s

0.076 s

0.072 s

10.

0.072 s

11.

0.072 s

12.

0.072 s

13.

0.072 s

14.

0.072 s

15.

0.072 s

▶

medium_random
medium random sequence, N = 100

✔

0.072 s

▶

maximal
maximal N and K

✔

0.072 s

0.100 s

0.072 s