Test results - Codility

Tasks Details

easy

1. PermMissingElem

Find the missing element in a given permutation.

Task Score

100%

Correctness

100%

Performance

100%

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:

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:

A[0] = 2 A[1] = 3 A[2] = 1 A[3] = 5

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)].

Solution

Programming language used Java 8

Time spent on task 10 minutes

Notes

not defined yet

Task timeline

Code: 03:51:10 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
    }
}

Code: 03:51:38 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
    }
}

Code: 03:51:49 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        
    }
}

Code: 03:56:07 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        B
    }
}

Code: 03:56:23 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        
    }
}

Code: 03:56:53 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }
    }
}

Code: 03:57:23 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i < A)
    }
}

Code: 03:57:54 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i < A.length + 1; i++) {
            if (!bs.get(i)) {
                re
            }
        }
    }
}

Code: 03:58:05 UTC, java, autosave

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// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i < A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
            }
        }
    }
}

Code: 03:58:20 UTC, java, verify, result: Passed

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// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i < A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

Analysis

expand all Example tests

▶

example
example test

✔

0.008 s

Code: 03:58:36 UTC, java, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i < A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

Code: 03:59:07 UTC, java, autosave

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i < A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

Code: 03:59:17 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i < A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

Code: 03:59:30 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i < A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

Code: 03:59:38 UTC, java, verify, result: Passed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i < A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

User test case 1:

[1, 2, 3, 4, 5]

User test case 2:

[5, 4, 3, 2, 1]

User test case 3:

[]

User test case 4:

[5, 4, 2, 1]

User test case 5:

[5, 4, 3, 2]

Analysis

expand all Example tests

▶

example
example test

✔

0.008 s

expand all User tests

▶

test_data1

✔

0.008 s

OK
function result: -1

▶

test_data2

✔

0.008 s

OK
function result: -1

▶

test_data3

✔

0.008 s

OK
function result: 1

▶

test_data4

✔

0.008 s

OK
function result: 3

▶

test_data5

✔

0.008 s

OK
function result: 1

Code: 04:00:20 UTC, java, autosave

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i <= A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

Code: 04:00:21 UTC, java, verify, result: Passed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i <= A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

User test case 1:

[1, 2, 3, 4, 5]

User test case 2:

[5, 4, 3, 2, 1]

User test case 3:

[]

User test case 4:

[5, 4, 2, 1]

User test case 5:

[5, 4, 3, 2]

Analysis

expand all Example tests

▶

example
example test

✔

0.008 s

expand all User tests

▶

test_data1

✔

0.008 s

OK
function result: 6

▶

test_data2

✔

0.008 s

OK
function result: 6

▶

test_data3

✔

0.008 s

OK
function result: 1

▶

test_data4

✔

0.008 s

OK
function result: 3

▶

test_data5

✔

0.008 s

OK
function result: 1

Code: 04:00:35 UTC, java, verify, result: Passed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i <= A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

User test case 1:

[1, 2, 3, 4, 5]

User test case 2:

[5, 4, 3, 2, 1]

User test case 3:

[]

User test case 4:

[5, 4, 2, 1]

User test case 5:

[5, 4, 3, 2]

Analysis

expand all Example tests

▶

example
example test

✔

0.008 s

expand all User tests

▶

test_data1

✔

0.008 s

OK
function result: 6

▶

test_data2

✔

0.008 s

OK
function result: 6

▶

test_data3

✔

0.008 s

OK
function result: 1

▶

test_data4

✔

0.008 s

OK
function result: 3

▶

test_data5

✔

0.008 s

OK
function result: 1

Code: 04:00:43 UTC, java, final, score: 100

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

// 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) {
        // write your code in Java SE 8
        if(A.length == 0) {
            return 1;
        }
        BitSet bs = new BitSet();
        for (int i = 0; i < A.length; i++) {
            bs.set(A[i]);
        }

        int ret = -1;
        for (int i = 1; i <= A.length + 1; i++) {
            if (!bs.get(i)) {
                ret = i;
                break;
            }
        }
        return ret;
    }
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N) or O(N * log(N))

expand all Example tests

▶

example
example test

✔

0.004 s

expand all Correctness tests

▶

empty_and_single
empty list and single element

✔

0.008 s

▶

missing_first_or_last
the first or the last element is missing

✔

0.008 s

▶

single
single element

✔

0.008 s

▶

double
two elements

✔

0.004 s

0.008 s

▶

simple
simple test

✔

0.008 s

expand all Performance tests

▶

medium1
medium test, length = ~10,000

✔

0.032 s

▶

medium2
medium test, length = ~10,000

✔

0.032 s

▶

large_range
range sequence, length = ~100,000

✔

0.292 s

0.136 s

0.140 s

▶

large1
large test, length = ~100,000

✔

0.288 s

▶

large2
large test, length = ~100,000

✔

0.168 s