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Test results - Codility L06 Dominator.html
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<!DOCTYPE html>
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<h4>Session</h4>
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<b>ID:</b> <span id="ticket-id">demoDMNCPU-KB9</span>
</div>
<div id="timelimit-min"><b>Time limit:</b> 120 min.</div>
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<h4 id="ticket-status">
Status: closed
</h4>
<div id="ticket-create-date"><b>Created on:</b> 2014-12-19 05:29 UTC</div>
<div id="ticket-start-date"><b>Started on:</b> 2014-12-19 05:30 UTC</div>
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<h4>Test score</h4>
<div class="help help-total-result" data-hasqtip="3"></div>
<b>91%</b>
<small>
91
out of 100 points
</small>
</div>
<table class="task-scores">
<tbody><tr>
<th class="task-col">Tasks in test</th>
<th class="partial-col">Correctness</th>
<th class="partial-col">Performance</th>
<th class="score-col">Task score</th>
</tr>
<tr>
<td class="task-col difficulty difficulty-1">
<strong>1</strong>
<img src="./Test results - Codility L06 Dominator_files/icon-type-algo-24.png" title="algo task">
<a href="https://codility.com/demo/results/demoDMNCPU-KB9/#task-0" title="Dominator">
Dominator
</a>
</td>
<td class="partial-col">
<div title="good" class="good ">
<div class="progress-bar">
<div class="filled" style="width: 87.00%"></div>
</div>
<span class="number">87%</span>
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</td>
<td class="partial-col">
<div title="good" class="good ">
<div class="progress-bar">
<div class="filled" style="width: 100.00%"></div>
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<span class="number">100%</span>
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<td class="score-col">
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91%
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The solution is being evaluated.
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<span><span>easy</span></span>
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score:
91 of 100
</span>
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<span style="display:none" class="result">91</span>
<span style="display:none" class="max-result">100</span>
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<div class="task-opener">
1.
<a href="https://codility.com/demo/results/demoDMNCPU-KB9/#" id="task-0-name" class="task-opener">Dominator</a>
</div>
<span class="task-synopsis">
Find an index of an array such that its value occurs at more than half of indices in the array.
</span>
</div>
</div>
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<td class="description-column">
<div class="hdr hdr-dark">Task description</div>
<div id="task-0-text">
<div id="brinza-task-description">
<p>A zero-indexed array A consisting of N integers is given. The <i>dominator</i> of array A is the value that occurs in more than half of the elements of A.</p>
<p>For example, consider array A such that</p>
<blockquote><p></p><pre><tt>A[0] = 3 A[1] = 4 A[2] = 3
A[3] = 2 A[4] = 3 A[5] = -1
A[6] = 3 A[7] = 3</tt></pre>
</blockquote>
<p>The dominator of A is 3 because it occurs in 5 out of 8 elements of A (namely in those with indices 0, 2, 4, 6 and 7) and 5 is more than a half of 8.</p>
<p>Write a function</p>
<blockquote><p class="lang-c" style="font-family: monospace; font-size: 9pt; display: none"><tt>
int solution(int A[], int N);
</tt></p></blockquote>
<blockquote><p class="lang-cpp" style="font-family: monospace; font-size: 9pt; display: none"><tt>
int solution(vector<int> &A);
</tt></p></blockquote>
<blockquote><p class="lang-pas" style="font-family: monospace; font-size: 9pt; display: none"><tt>
function solution(A: array of longint; N: longint): longint;
</tt></p></blockquote>
<blockquote><p class="lang-java" style="font-family: monospace; font-size: 9pt; display: none"><tt>
class Solution { public int solution(int[] A); }
</tt></p></blockquote>
<blockquote><p class="lang-py" style="font-family: monospace; font-size: 9pt; display: none"><tt>
def solution(A)
</tt></p></blockquote>
<blockquote><p class="lang-php" style="font-family: monospace; font-size: 9pt; display: none"><tt>
function solution($A);
</tt></p></blockquote>
<blockquote><p class="lang-cs" style="font-family: monospace; font-size: 9pt; display: block"><tt>
class Solution { public int solution(int[] A); }
</tt></p></blockquote>
<blockquote><p class="lang-js" style="font-family: monospace; font-size: 9pt; display: none"><tt>
function solution(A);
</tt></p></blockquote>
<blockquote><p class="lang-pl" style="font-family: monospace; font-size: 9pt; display: none"><tt>
sub solution { my (@A)=@_; ... }
</tt></p></blockquote>
<blockquote><p class="lang-rb" style="font-family: monospace; font-size: 9pt; display: none"><tt>
def solution(a)
</tt></p></blockquote>
<blockquote><p class="lang-vb" style="font-family: monospace; font-size: 9pt; display: none"><tt>
Private Function solution(A As Integer()) As Integer
</tt></p></blockquote>
<blockquote><p class="lang-lua" style="font-family: monospace; font-size: 9pt; display: none"><tt>
function solution(A)
</tt></p></blockquote>
<blockquote><p class="lang-m" style="font-family: monospace; font-size: 9pt; display: none"><tt>
int solution(NSMutableArray *A);
</tt></p></blockquote>
<blockquote><p class="lang-scala" style="font-family: monospace; font-size: 9pt; display: none"><tt>
object Solution { def solution(A: Array[Int]): Int }
</tt></p></blockquote>
<blockquote><p class="lang-go" style="font-family: monospace; font-size: 9pt; display: none"><tt>
func Solution(A []int) int
</tt></p></blockquote>
<p>that, given a zero-indexed array A consisting of N integers, returns index of any element of array A in which the dominator of A occurs. The function should return −1 if array A does not have a dominator.</p>
<p>Assume that:</p>
<blockquote><ul style="margin: 10px;padding: 0px;"><li>N is an integer within the range [<span class="number">0</span>..<span class="number">100,000</span>];</li>
<li>each element of array A is an integer within the range [<span class="number">−2,147,483,648</span>..<span class="number">2,147,483,647</span>].</li>
</ul>
</blockquote><p>For example, given array A such that</p>
<blockquote><p></p><pre><tt>A[0] = 3 A[1] = 4 A[2] = 3
A[3] = 2 A[4] = 3 A[5] = -1
A[6] = 3 A[7] = 3</tt></pre>
</blockquote>
<p>the function may return 0, 2, 4, 6 or 7, as explained above.</p>
<p>Complexity:</p>
<blockquote><ul style="margin: 10px;padding: 0px;"><li>expected worst-case time complexity is O(N);</li>
<li>expected worst-case space complexity is O(1), beyond input storage (not counting the storage required for input arguments).</li>
</ul>
</blockquote><p>Elements of input arrays can be modified.</p>
</div>
<div style="margin-top:5px">
<small>Copyright 2009–2014 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.</small>
</div>
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</td>
<td class="spacer-column"> </td>
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<div class="hdr hdr-dark" style="position:relative">
Solution
<div style="position:absolute;right:10px;top:4px;">
</div>
</div>
<div class="hdr">
<b>Programming language used:</b> <span class="language_used" style="font-weight: normal">C#</span>
</div>
<div class="hdr">
<div class="help help-total-time" data-hasqtip="0"></div>
<b>Total time used: 21 minutes</b>
</div>
<div class="hdr">
<div class="help help-effective-time" data-hasqtip="1"></div>
<b>Effective time used: 21 minutes</b>
</div>
<div class="hdr">
<span class="left">Notes: </span>
<div id="sol-desc-0-container">
<div id="sol-desc-0" style="display:block; text-align : left;">
<span class="value user_notes_right" style="font-weight:normal">
<i>not defined yet</i>
</span>
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<div style="float:right" id="solution-slider-0-time-end">05:50:39</div>
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Code: 05:50:39 UTC,
cs,
final,
score: <strong>91.00</strong>
</div>
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<div class="line-numbers">
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</div>
<div class="code-highlight">
<pre id="code-0-35"><code data-prg-lang="cs" class="language-cs hljs"><span class="line "><span class="hljs-keyword">using</span> System;</span>
<span class="line "><span class="hljs-comment">// you can also use other imports, for example:</span></span>
<span class="line "><span class="hljs-comment">// using System.Collections.Generic;</span></span>
<span class="line "></span>
<span class="line "><span class="hljs-comment">// you can use Console.WriteLine for debugging purposes, e.g.</span></span>
<span class="line "><span class="hljs-comment">// Console.WriteLine("this is a debug message");</span></span>
<span class="line "></span>
<span class="line "><span class="hljs-keyword">class</span> <span class="hljs-title">Solution</span> {</span>
<span class="line "> <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">int</span> <span class="hljs-title">solution</span><span class="hljs-params">(<span class="hljs-keyword">int</span>[] A)</span> </span>{</span>
<span class="line "> </span>
<span class="line "> <span class="hljs-keyword">int</span> candidate = A[<span class="hljs-number">0</span>];</span>
<span class="line "> <span class="hljs-keyword">int</span> count = <span class="hljs-number">0</span>;</span>
<span class="line "> </span>
<span class="line "> <span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < A.Length; i++)</span>
<span class="line "> {</span>
<span class="line "> <span class="hljs-keyword">if</span> (count == <span class="hljs-number">0</span>)</span>
<span class="line "> {</span>
<span class="line "> count = <span class="hljs-number">1</span>;</span>
<span class="line "> candidate = A[i];</span>
<span class="line "> }</span>
<span class="line "> <span class="hljs-keyword">else</span></span>
<span class="line "> {</span>
<span class="line "> <span class="hljs-keyword">if</span> (candidate != A[i])</span>
<span class="line "> count--;</span>
<span class="line "> <span class="hljs-keyword">else</span></span>
<span class="line "> count++;</span>
<span class="line "> }</span>
<span class="line "> }</span>
<span class="line "> </span>
<span class="line "> <span class="hljs-keyword">if</span> (count <= <span class="hljs-number">0</span>) <span class="hljs-comment">// although negative is not possible</span></span>
<span class="line "> <span class="hljs-keyword">return</span> -<span class="hljs-number">1</span>; <span class="hljs-comment">// there are no candidate </span></span>
<span class="line "> </span>
<span class="line "> <span class="hljs-keyword">int</span> occurance = <span class="hljs-number">0</span>;</span>
<span class="line "> <span class="hljs-keyword">int</span> occuredIndex = <span class="hljs-number">0</span>;</span>
<span class="line "> </span>
<span class="line "> <span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < A.Length; i++)</span>
<span class="line "> {</span>
<span class="line "> <span class="hljs-keyword">if</span> (A[i] == candidate)</span>
<span class="line "> {</span>
<span class="line "> occurance++;</span>
<span class="line "> occuredIndex = i;</span>
<span class="line "> }</span>
<span class="line "> }</span>
<span class="line "> </span>
<span class="line "> <span class="hljs-keyword">if</span> (occurance > A.Length / <span class="hljs-number">2</span>)</span>
<span class="line "> <span class="hljs-keyword">return</span> occuredIndex;</span>
<span class="line "> </span>
<span class="line "> <span class="hljs-keyword">return</span> -<span class="hljs-number">1</span>;</span>
<span class="line "> }</span>
<span class="line ">}</span>
<span class="line "></span></code></pre>
</div>
</div>
</div>
<div class="analysis">
<div class="hdr hdr-dark">
<div class="help help-analysis" data-hasqtip="5"></div>
Analysis
<div class="clr"></div>
</div>
<div class="hdr detected-time-print">
Detected time complexity:<br><b style="font-size: 200%">O(N*log(N)) or O(N)</b>
</div>
<table class="tests-table">
<thead>
<tr>
<th>test</th>
<th>time</th>
<th class="plot-header"></th>
<th colspan="2">result</th>
</tr>
</thead>
<thead>
<tr>
<th class="group example" colspan="4">Example tests</th>
</tr>
</thead>
<tbody>
<tr>
<td>
example
<br>
<small>example test</small>
</td>
<td align="right">0.068 s</td>
<td colspan=" 2 ">
<b>OK</b>
</td>
</tr>
</tbody>
<thead>
<tr>
<th class="group func" colspan="4">Correctness tests</th>
</tr>
</thead>
<tbody>
<tr>
<td>
small_nondominator
<br>
<small>all different and all the same elements</small>
</td>
<td align="right">0.060 s</td>
<td colspan=" 2 ">
<b>OK</b>
</td>
</tr>
<tr>
<td>
small_half_positions
<br>
<small>half elements the same, and half + 1 elements the same</small>
</td>
<td align="right">0.064 s</td>
<td colspan=" 2 ">
<b>OK</b>
</td>
</tr>
<tr>
<td>
small
<br>
<small>small test</small>
</td>
<td align="right">0.068 s</td>
<td colspan=" 2 ">
<b>OK</b>
</td>
</tr>
<tr>
<td>
small_pyramid
<br>
<small>decreasing and plateau, small</small>
</td>
<td align="right">0.064 s</td>
<td colspan=" 2 ">
<b>OK</b>
</td>
</tr>
<tr>
<td>
extreme_empty_and_single_item
<br>
<small>empty and single element arrays</small>
</td>
<td align="right">0.060 s</td>
<td colspan=" 2 ">
<b>RUNTIME ERROR</b>
<br>
<small style="white-space: pre-wrap">tested program terminated unexpectedly</small>
</td>
</tr>
<tr class="output">
<td colspan="4">
<div style="max-height: 110px; overflow-y: auto;"><small>
stderr:
<pre>Unhandled Exception:
System.IndexOutOfRangeException: Array index is out of range.
at Solution.solution (System.Int32[] A) [0x00000] in <filename unknown>:0
at SolutionWrapper.run (System.String input, System.String output) [0x00000] in <filename unknown>:0
at SolutionWrapper.Main (System.String[] args) [0x00000] in <filename unknown>:0
[ERROR] FATAL UNHANDLED EXCEPTION: System.IndexOutOfRangeException: Array index is out of range.
at Solution.solution (System.Int32[] A) [0x00000] in <filename unknown>:0
at SolutionWrapper.run (System.String input, System.String output) [0x00000] in <filename unknown>:0
at SolutionWrapper.Main (System.String[] args) [0x00000] in <filename unknown>:0
</pre>