Test results - Codility

Tasks Details

medium

1. MissingInteger

Find the smallest positive integer that does not occur in a given sequence.

Task Score

100%

Correctness

100%

Performance

100%

This is a demo task.

Write a function:

function solution(A);

that, given an array A of N integers, returns the smallest positive integer (greater than 0) that does not occur in A.

For example, given A = [1, 3, 6, 4, 1, 2], the function should return 5.

Given A = [1, 2, 3], the function should return 4.

Given A = [−1, −3], the function should return 1.

Write an efficient algorithm for the following assumptions:

N is an integer within the range [1..100,000];

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

Solution

Programming language used JavaScript

Time spent on task 15 minutes

Notes

not defined yet

Task timeline

Code: 14:13:58 UTC, java, autosave

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

Code: 14:15:52 UTC, js, autosave

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

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

Code: 14:22:48 UTC, js, autosave

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

function solution(A) {
  let max = Math.max(A);
  if (max < 0) return 1;
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  if ((index = -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Code: 14:22:48 UTC, js, verify, result: Failed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

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

function solution(A) {
  let max = Math.max(A);
  if (max < 0) return 1;
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  if ((index = -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Analysis

expand all Example tests

▶

example1
first example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

RangeError: Invalid array length
    at solution (solution.js:7:11)
    at solutionWrapper (/tmp/exec.js:402:28)
    at Promise.resolve.then (/tmp/exec.js:428:24)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
    at Function.Module.runMain (module.js:686:11)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

▶

example2
second example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

RangeError: Invalid array length
    at solution (solution.js:7:11)
    at solutionWrapper (/tmp/exec.js:402:28)
    at Promise.resolve.then (/tmp/exec.js:428:24)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
    at Function.Module.runMain (module.js:686:11)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

▶

example3
third example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

RangeError: Invalid array length
    at solution (solution.js:7:11)
    at solutionWrapper (/tmp/exec.js:402:28)
    at Promise.resolve.then (/tmp/exec.js:428:24)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
    at Function.Module.runMain (module.js:686:11)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

Code: 14:24:06 UTC, js, autosave

show code in pop-up

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

function solution(A) {
  let max = Math.max(A);
  if (max < 0) return 1;
  co
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  if ((index = -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Code: 14:24:16 UTC, js, verify, result: Failed

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

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

function solution(A) {
  let max = Math.max(A);
  if (max < 0) return 1;
  console.log(max);
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  if ((index = -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Analysis

expand all Example tests

▶

example1
first example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

RangeError: Invalid array length
    at solution (solution.js:8:11)
    at solutionWrapper (/tmp/exec.js:402:28)
    at Promise.resolve.then (/tmp/exec.js:428:24)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
    at Function.Module.runMain (module.js:686:11)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

stdout:

NaN

▶

example2
second example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

RangeError: Invalid array length
    at solution (solution.js:8:11)
    at solutionWrapper (/tmp/exec.js:402:28)
    at Promise.resolve.then (/tmp/exec.js:428:24)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
    at Function.Module.runMain (module.js:686:11)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

stdout:

NaN

▶

example3
third example test

✘

RUNTIME ERROR
tested program terminated with exit code 1

0.072 s

RUNTIME ERROR, tested program terminated with exit code 1

stderr:

RangeError: Invalid array length
    at solution (solution.js:8:11)
    at solutionWrapper (/tmp/exec.js:402:28)
    at Promise.resolve.then (/tmp/exec.js:428:24)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
    at Function.Module.runMain (module.js:686:11)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

stdout:

NaN

Code: 14:26:13 UTC, js, autosave

show code in pop-up

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

function solution(A) {
  let max = Math.max.(A);
  if (max < 0) return 1;
  console.log(max);
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  if ((index = -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Code: 14:26:22 UTC, js, verify, result: Failed

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

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

function solution(A) {
  let max = Math.max.apply(null,A);
  if (max < 0) return 1;
  console.log(max);
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  if ((index = -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Analysis

expand all Example tests

▶

example1
first example test

✘

WRONG ANSWER
got 7 expected 5

0.076 s

WRONG ANSWER, got 7 expected 5

stdout:

▶

example2
second example test

✔

0.076 s

stdout:

▶

example3
third example test

✔

0.072 s

Code: 14:26:43 UTC, js, 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

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

function solution(A) {
  let max = Math.max.apply(null,A);
  if (max < 0) return 1;
  console.log(max);
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  console.log(index)
  console.log(B)
  if ((index = -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Code: 14:26:45 UTC, js, verify, result: Failed

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

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

function solution(A) {
  let max = Math.max.apply(null,A);
  if (max < 0) return 1;
  console.log(max);
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  console.log(index)
  console.log(B)
  if ((index = -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Analysis

expand all Example tests

▶

example1
first example test

✘

WRONG ANSWER
got 7 expected 5

0.072 s

WRONG ANSWER, got 7 expected 5

stdout:

6
4
[ 2, 1, 1, 1, 0, 1 ]

▶

example2
second example test

✔

0.072 s

stdout:

3
-1
[ 1, 1, 1 ]

▶

example3
third example test

✔

0.068 s

Code: 14:27:17 UTC, js, 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

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

function solution(A) {
  let max = Math.max.apply(null,A);
  if (max < 0) return 1;
  console.log(max);
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  console.log(index)
  console.log(B)
  if ((index === -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Code: 14:27:18 UTC, js, 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

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

function solution(A) {
  let max = Math.max.apply(null,A);
  if (max < 0) return 1;
  console.log(max);
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  console.log(index)
  console.log(B)
  if ((index === -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Analysis

expand all Example tests

▶

example1
first example test

✔

0.072 s

stdout:

6
4
[ 2, 1, 1, 1, 0, 1 ]

▶

example2
second example test

✔

0.072 s

stdout:

3
-1
[ 1, 1, 1 ]

▶

example3
third example test

✔

0.068 s

Code: 14:28:16 UTC, js, 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

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

function solution(A) {
  let max = Math.max.apply(null,A);
  if (max < 0) return 1;
  console.log(max);
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  console.log(index)
  if ((index === -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Code: 14:28:24 UTC, js, 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

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

function solution(A) {
  let max = Math.max.apply(null,A);
  if (max < 0) return 1;
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  if ((index === -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Analysis

expand all Example tests

▶

example1
first example test

✔

0.068 s

▶

example2
second example test

✔

0.068 s

▶

example3
third example test

✔

0.096 s

Code: 14:28:30 UTC, js, 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

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

function solution(A) {
  let max = Math.max.apply(null,A);
  if (max < 0) return 1;
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  if ((index === -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Analysis

expand all Example tests

▶

example1
first example test

✔

0.072 s

▶

example2
second example test

✔

0.072 s

▶

example3
third example test

✔

0.072 s

Code: 14:28:33 UTC, js, 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

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

function solution(A) {
  let max = Math.max.apply(null,A);
  if (max < 0) return 1;
  let B = new Array(max).fill(0);
  for (let i = 0; i < A.length; i++) {
    if (A[i] > 0) {
      B[A[i] - 1]++;
    }
  }
  let index = B.indexOf(0);
  if ((index === -1)) {
    return max + 1;
  } else {
    return index + 1;
  }
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

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

expand all Example tests

▶

example1
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_single
a single element

✔

0.072 s

▶

simple
simple test

✔

0.072 s

▶

extreme_min_max_value
minimal and maximal values

✔

0.100 s

▶

positive_only
shuffled sequence of 0...100 and then 102...200

✔

0.072 s

▶

negative_only
shuffled sequence -100 ... -1

✔

0.072 s

expand all Performance tests

▶

medium
chaotic sequences length=10005 (with minus)

✔

0.084 s

0.080 s

0.116 s

▶

large_1
chaotic + sequence 1, 2, ..., 40000 (without minus)

✔

0.112 s

▶

large_2
shuffled sequence 1, 2, ..., 100000 (without minus)

✔

0.120 s

0.116 s

▶

large_3
chaotic + many -1, 1, 2, 3 (with minus)

✔

0.136 s