Codility. Autor: Grzegorz Jakacki
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Codility We test coders
Transcript of Codility. Autor: Grzegorz Jakacki
CodilityWe test coders
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/* Story */
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/* Story */
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/* Story */
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/* Story */
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/* Story */
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/* Hiring */
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/* Hiring */
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/* Hiring */
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2010 - Shanghai Jiao Tong University, China2009 - Saint Petersburg State University, Russia2008 - Saint Petersburg State University, Russia2007 - Warsaw University, Poland2006 - Saratov State University, Russia2005 - Shanghai Jiao Tong University, China2004 - Saint Petersburg State University, Russia2003 - University of Warsaw, Poland2002 - Shanghai Jiao Tong University, China
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prev curr next
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prev curr next
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prev curr next
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prev curr next
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prev curr next
N* reverse(N* p) { if (!p) return p; prev = NULL; curr = p; next = p->next; while (next) { curr->next = prev; prev = curr; curr = next; next = next->next; } return curr;}
przełóż wskaźnik listy
przesuń prev/curr/next
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LISTA
STOS
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Stack reverse(Stack src) { Stack dest; while (src.nonempty()) { x = src.pop(); dest.push(x); } return dest;}
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Stack reverse(Stack s){ Stack d; while (s.nonempty()) { x = s.pop(); d.push(x); } return d;}
N* reverse(N* s){ d = NULL; while (s) { x = s; s = s->next; x->next = d; d = x; } return d;}
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Idea!
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Idea!
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suma = -1 suma = -1
punkt równowagi
-7 1 5 2 -4 3 0
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suma = 0 suma = 0(ciąg pusty)
punkt równowagi
-7 1 5 2 -4 3 0
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def equi(A): for j in xrange(len(A)): if sum(A[:j]) == sum(A[j+1:]): return j return -1
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90%
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Candidate ranking
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http://codility.com/demo/take-sample-test/
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CO DALEJ?
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CO DALEJ?
Mutacje zadań
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CO DALEJ?
Mutacje zadań
Ocena adaptatywna
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CO DALEJ?
Mutacje zadań
Ocena adaptatywna
Model Checking(praktyki!)
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Info, praktyki, foto-opportunities:
Grzegorz JakackiCodility CTO&CEO
CodilityWe test coders
