Tasks Details
easy
1.
Triangle
Determine whether a triangle can be built from a given set of edges.
Task Score
100%
Correctness
100%
Performance
100%
An array A consisting of N integers is given. A triplet (P, Q, R) is triangular if 0 ≤ P < Q < R < N and:
- A[P] + A[Q] > A[R],
- A[Q] + A[R] > A[P],
- A[R] + A[P] > A[Q].
For example, consider array A such that:
A[0] = 10 A[1] = 2 A[2] = 5 A[3] = 1 A[4] = 8 A[5] = 20Triplet (0, 2, 4) is triangular.
Write a function:
def solution(A)
that, given an array A consisting of N integers, returns 1 if there exists a triangular triplet for this array and returns 0 otherwise.
For example, given array A such that:
A[0] = 10 A[1] = 2 A[2] = 5 A[3] = 1 A[4] = 8 A[5] = 20the function should return 1, as explained above. Given array A such that:
A[0] = 10 A[1] = 50 A[2] = 5 A[3] = 1the function should return 0.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [0..100,000];
- each element of array A is an integer within the range [−2,147,483,648..2,147,483,647].
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
Solution
Programming language used Python
Time spent on task 2 minutes
Notes
not defined yet
Code: 10:09:07 UTC,
java,
autosave
Code: 10:09:56 UTC,
py,
verify,
result: Failed
Analysis
expand all
Example tests
example
example, positive answer, length=6
example, positive answer, length=6
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.036 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Traceback (most recent call last):
File "exec.py", line 129, in <module>
main()
File "exec.py", line 91, in main
result = solution( A )
File "/tmp/solution.py", line 6, in solution
for i in xrange(len(A)-2):
NameError: name 'xrange' is not defined
example1
example, answer is zero, length=4
example, answer is zero, length=4
✘
RUNTIME ERROR
tested program terminated with exit code 1
tested program terminated with exit code 1
1.
0.036 s
RUNTIME ERROR,
tested program terminated with exit code 1
stderr:
Traceback (most recent call last):
File "exec.py", line 129, in <module>
main()
File "exec.py", line 91, in main
result = solution( A )
File "/tmp/solution.py", line 6, in solution
for i in xrange(len(A)-2):
NameError: name 'xrange' is not defined
Code: 10:10:11 UTC,
py,
verify,
result: Passed
Analysis
Code: 10:10:15 UTC,
py,
verify,
result: Passed
Analysis
Code: 10:10:18 UTC,
py,
final,
score:
100
Analysis summary
The solution obtained perfect score.
Analysis
Detected time complexity:
O(N*log(N))
expand all
Correctness tests
1.
0.036 s
OK
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0.036 s
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0.036 s
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0.036 s
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6.
0.036 s
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1.
0.036 s
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3.
0.036 s
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4.
0.040 s
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5.
0.036 s
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6.
0.036 s
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1.
0.036 s
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2.
0.036 s
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3.
0.036 s
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0.036 s
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5.
0.036 s
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6.
0.036 s
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1.
0.036 s
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3.
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6.
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1.
0.036 s
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6.
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5.
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6.
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6.
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expand all
Performance tests
1.
0.048 s
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2.
0.036 s
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3.
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4.
0.036 s
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5.
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6.
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1.
0.144 s
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2.
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3.
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4.
0.036 s
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5.
0.036 s
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6.
0.036 s
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1.
0.164 s
OK
2.
0.036 s
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3.
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4.
0.036 s
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5.
0.036 s
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6.
0.036 s
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1.
0.208 s
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2.
0.036 s
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3.
0.036 s
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4.
0.036 s
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5.
0.036 s
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6.
0.036 s
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1.
0.188 s
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2.
0.036 s
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3.
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4.
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5.
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6.
0.036 s
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1.
0.168 s
OK
2.
0.036 s
OK
3.
0.036 s
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4.
0.036 s
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5.
0.036 s
OK
6.
0.036 s
OK