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Greatest common substring
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$begingroup$
Create a program or function which takes a list of strings as input, and outputs the longest string that is a substring of all input strings. If there are several substrings of equal length, and no longer substring, output any one of them.
- This may mean outputting the empty string.
- If there are several valid outputs, you may output any one of them. You are not required to give consistent outpput for a given input so long as the output is always valid.
- There will always be at least one string in the input, but there might not be a non-empty string.
- You may take input or produce output by any of the default methods.
Standard loopholes aren't allowed.- This is code-golf - the fewer bytes of code, the better.
Test cases:
[Inputs] -> [Valid outputs (choose one)]
["hello", "'ello"] -> ["ello"]
["very", "much", "different"] -> [""]
["empty", "", "STRING"] -> [""]
["identical", "identical"] -> ["identical"]
["string", "stRIng"] -> ["st", "ng"]
["this one", "is a substring of this one"] -> ["this one"]
["just one"] -> ["just one"]
["", "", ""] -> [""]
["many outputs", "stuptuo ynam"] -> ["m", "a", "n", "y", " ", "o", "u", "t", "p", "s"]
["many inputs", "any inputs", "ny iii", "yanny"] -> ["ny"]
code-golf string subsequence
asked 1 hour ago
Sara JSara J
1715
$endgroup$
add a comment |
$begingroup$
Create a program or function which takes a list of strings as input, and outputs the longest string that is a substring of all input strings. If there are several substrings of equal length, and no longer substring, output any one of them.
- This may mean outputting the empty string.
- If there are several valid outputs, you may output any one of them. You are not required to give consistent outpput for a given input so long as the output is always valid.
- There will always be at least one string in the input, but there might not be a non-empty string.
- You may take input or produce output by any of the default methods.
Standard loopholes aren't allowed.- This is code-golf - the fewer bytes of code, the better.
Test cases:
[Inputs] -> [Valid outputs (choose one)]
["hello", "'ello"] -> ["ello"]
["very", "much", "different"] -> [""]
["empty", "", "STRING"] -> [""]
["identical", "identical"] -> ["identical"]
["string", "stRIng"] -> ["st", "ng"]
["this one", "is a substring of this one"] -> ["this one"]
["just one"] -> ["just one"]
["", "", ""] -> [""]
["many outputs", "stuptuo ynam"] -> ["m", "a", "n", "y", " ", "o", "u", "t", "p", "s"]
["many inputs", "any inputs", "ny iii", "yanny"] -> ["ny"]
code-golf string subsequence
asked 1 hour ago
Sara JSara J
1715
$endgroup$
$begingroup$
Possible duplicate
$endgroup$
– Adám
1 hour ago
$begingroup$
@Adám That question asks for the longest common subsequence, not substring.
$endgroup$
– Doorknob♦
1 hour ago
$begingroup$
Will the strings be only alphanumeric, or alphabetic, or only printable-ascii?
$endgroup$
– Embodiment of Ignorance
7 mins ago
add a comment |
$begingroup$
Create a program or function which takes a list of strings as input, and outputs the longest string that is a substring of all input strings. If there are several substrings of equal length, and no longer substring, output any one of them.
- This may mean outputting the empty string.
- If there are several valid outputs, you may output any one of them. You are not required to give consistent outpput for a given input so long as the output is always valid.
- There will always be at least one string in the input, but there might not be a non-empty string.
- You may take input or produce output by any of the default methods.
Standard loopholes aren't allowed.- This is code-golf - the fewer bytes of code, the better.
Test cases:
[Inputs] -> [Valid outputs (choose one)]
["hello", "'ello"] -> ["ello"]
["very", "much", "different"] -> [""]
["empty", "", "STRING"] -> [""]
["identical", "identical"] -> ["identical"]
["string", "stRIng"] -> ["st", "ng"]
["this one", "is a substring of this one"] -> ["this one"]
["just one"] -> ["just one"]
["", "", ""] -> [""]
["many outputs", "stuptuo ynam"] -> ["m", "a", "n", "y", " ", "o", "u", "t", "p", "s"]
["many inputs", "any inputs", "ny iii", "yanny"] -> ["ny"]
code-golf string subsequence
asked 1 hour ago
Sara JSara J
1715
$endgroup$
Create a program or function which takes a list of strings as input, and outputs the longest string that is a substring of all input strings. If there are several substrings of equal length, and no longer substring, output any one of them.
- This may mean outputting the empty string.
- If there are several valid outputs, you may output any one of them. You are not required to give consistent outpput for a given input so long as the output is always valid.
- There will always be at least one string in the input, but there might not be a non-empty string.
- You may take input or produce output by any of the default methods.
Standard loopholes aren't allowed.- This is code-golf - the fewer bytes of code, the better.
Test cases:
[Inputs] -> [Valid outputs (choose one)]
["hello", "'ello"] -> ["ello"]
["very", "much", "different"] -> [""]
["empty", "", "STRING"] -> [""]
["identical", "identical"] -> ["identical"]
["string", "stRIng"] -> ["st", "ng"]
["this one", "is a substring of this one"] -> ["this one"]
["just one"] -> ["just one"]
["", "", ""] -> [""]
["many outputs", "stuptuo ynam"] -> ["m", "a", "n", "y", " ", "o", "u", "t", "p", "s"]
["many inputs", "any inputs", "ny iii", "yanny"] -> ["ny"]
code-golf string subsequence
code-golf string subsequence
asked 1 hour ago
Sara JSara J
1715
asked 1 hour ago
Sara JSara J
1715
asked 1 hour ago
Sara JSara J
1715
asked 1 hour ago
Sara JSara J
1715
asked 1 hour ago
Sara JSara J
1715
1715
$begingroup$
Possible duplicate
$endgroup$
– Adám
1 hour ago
$begingroup$
@Adám That question asks for the longest common subsequence, not substring.
$endgroup$
– Doorknob♦
1 hour ago
$begingroup$
Will the strings be only alphanumeric, or alphabetic, or only printable-ascii?
$endgroup$
– Embodiment of Ignorance
7 mins ago
add a comment |
$begingroup$
Possible duplicate
$endgroup$
– Adám
1 hour ago
$begingroup$
@Adám That question asks for the longest common subsequence, not substring.
$endgroup$
– Doorknob♦
1 hour ago
$begingroup$
Will the strings be only alphanumeric, or alphabetic, or only printable-ascii?
$endgroup$
– Embodiment of Ignorance
7 mins ago
$begingroup$
Possible duplicate
$endgroup$
– Adám
1 hour ago
$begingroup$
Possible duplicate
$endgroup$
– Adám
1 hour ago
$begingroup$
@Adám That question asks for the longest common subsequence, not substring.
$endgroup$
– Doorknob♦
1 hour ago
$begingroup$
@Adám That question asks for the longest common subsequence, not substring.
$endgroup$
– Doorknob♦
1 hour ago
$begingroup$
Will the strings be only alphanumeric, or alphabetic, or only printable-ascii?
$endgroup$
– Embodiment of Ignorance
7 mins ago
$begingroup$
Will the strings be only alphanumeric, or alphabetic, or only printable-ascii?
$endgroup$
– Embodiment of Ignorance
7 mins ago
add a comment |
4 Answers
4
active
oldest
votes
$begingroup$
Jelly, 12 bytes
Ẇ€œ&/LÐṀḢ¹L?
Try it online!
Last four bytes are there because of the requirement to only output one answer.
answered 54 mins ago
Nick KennedyNick Kennedy
92147
$endgroup$
add a comment |
$begingroup$
Not golfed it much yet but here's my Python 3 answer at 354 bytes:
EDIT: Now 238 bytes with one space indents and some one-line iterators:
EDIT: 193 bytes with max function
EDIT: 189 bytes removed unnecessary list
def a(b):
a=();c=list(sum(list(list(d[f:e]for f in range(e))for e in range(len(d)+1)),[])for d in b)
for i in c[0]:
if all(i in j for j in c):
a+=(i,)
return max(a,key=len)
answered 46 mins ago
Artemis FowlArtemis Fowl
1013
New contributor
Artemis Fowl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
You may want to use single spaces as indentation instead of 4 that seems to shave more than 100 bytes.
$endgroup$
– Shieru Asakoto
43 mins ago
$begingroup$
@ShieruAsakoto Oops yeah.
$endgroup$
– Artemis Fowl
36 mins ago
$begingroup$
135 bytes by simplifying thecdeclaration and condensing theforloop. I would recommend adding the title and bytecount to the header, or using TIO's formatter to create the body of your post
$endgroup$
– Jo King
7 mins ago
$begingroup$
102 bytes by using set operators instead
$endgroup$
– Jo King
2 mins ago
add a comment |
$begingroup$
JavaScript (Node.js), 114 105 bytes
a=>(F=(l,n,w=a[0].substr(n,l))=>l?n<0?F(--l,L-l):a.some(y=>y.search(w)<0)?F(l,n-1):w:"")(L=a[0].length,0)
Try it online!
Probably still golfable.
y.indexOf must be used in place of y.search if the strings may contain special regex characters, at the cost of 1 more byte.
answered 16 mins ago
Shieru AsakotoShieru Asakoto
2,750317
$endgroup$
add a comment |
$begingroup$
Brachylog, 3 bytes
sᵛw
Try it online!
Full program.
$endgroup$
add a comment |
Your Answer
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Jelly, 12 bytes
Ẇ€œ&/LÐṀḢ¹L?
Try it online!
Last four bytes are there because of the requirement to only output one answer.
answered 54 mins ago
Nick KennedyNick Kennedy
92147
$endgroup$
add a comment |
$begingroup$
Jelly, 12 bytes
Ẇ€œ&/LÐṀḢ¹L?
Try it online!
Last four bytes are there because of the requirement to only output one answer.
answered 54 mins ago
Nick KennedyNick Kennedy
92147
$endgroup$
add a comment |
$begingroup$
Jelly, 12 bytes
Ẇ€œ&/LÐṀḢ¹L?
Try it online!
Last four bytes are there because of the requirement to only output one answer.
answered 54 mins ago
Nick KennedyNick Kennedy
92147
$endgroup$
Jelly, 12 bytes
Ẇ€œ&/LÐṀḢ¹L?
Try it online!
Last four bytes are there because of the requirement to only output one answer.
answered 54 mins ago
Nick KennedyNick Kennedy
92147
answered 54 mins ago
Nick KennedyNick Kennedy
92147
answered 54 mins ago
Nick KennedyNick Kennedy
92147
answered 54 mins ago
Nick KennedyNick Kennedy
92147
92147
add a comment |
add a comment |
$begingroup$
Not golfed it much yet but here's my Python 3 answer at 354 bytes:
EDIT: Now 238 bytes with one space indents and some one-line iterators:
EDIT: 193 bytes with max function
EDIT: 189 bytes removed unnecessary list
def a(b):
a=();c=list(sum(list(list(d[f:e]for f in range(e))for e in range(len(d)+1)),[])for d in b)
for i in c[0]:
if all(i in j for j in c):
a+=(i,)
return max(a,key=len)
answered 46 mins ago
Artemis FowlArtemis Fowl
1013
New contributor
Artemis Fowl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
You may want to use single spaces as indentation instead of 4 that seems to shave more than 100 bytes.
$endgroup$
– Shieru Asakoto
43 mins ago
$begingroup$
@ShieruAsakoto Oops yeah.
$endgroup$
– Artemis Fowl
36 mins ago
$begingroup$
135 bytes by simplifying thecdeclaration and condensing theforloop. I would recommend adding the title and bytecount to the header, or using TIO's formatter to create the body of your post
$endgroup$
– Jo King
7 mins ago
$begingroup$
102 bytes by using set operators instead
$endgroup$
– Jo King
2 mins ago
add a comment |
$begingroup$
Not golfed it much yet but here's my Python 3 answer at 354 bytes:
EDIT: Now 238 bytes with one space indents and some one-line iterators:
EDIT: 193 bytes with max function
EDIT: 189 bytes removed unnecessary list
def a(b):
a=();c=list(sum(list(list(d[f:e]for f in range(e))for e in range(len(d)+1)),[])for d in b)
for i in c[0]:
if all(i in j for j in c):
a+=(i,)
return max(a,key=len)
answered 46 mins ago
Artemis FowlArtemis Fowl
1013
New contributor
Artemis Fowl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
You may want to use single spaces as indentation instead of 4 that seems to shave more than 100 bytes.
$endgroup$
– Shieru Asakoto
43 mins ago
$begingroup$
@ShieruAsakoto Oops yeah.
$endgroup$
– Artemis Fowl
36 mins ago
$begingroup$
135 bytes by simplifying thecdeclaration and condensing theforloop. I would recommend adding the title and bytecount to the header, or using TIO's formatter to create the body of your post
$endgroup$
– Jo King
7 mins ago
$begingroup$
102 bytes by using set operators instead
$endgroup$
– Jo King
2 mins ago
add a comment |
$begingroup$
Not golfed it much yet but here's my Python 3 answer at 354 bytes:
EDIT: Now 238 bytes with one space indents and some one-line iterators:
EDIT: 193 bytes with max function
EDIT: 189 bytes removed unnecessary list
def a(b):
a=();c=list(sum(list(list(d[f:e]for f in range(e))for e in range(len(d)+1)),[])for d in b)
for i in c[0]:
if all(i in j for j in c):
a+=(i,)
return max(a,key=len)
answered 46 mins ago
Artemis FowlArtemis Fowl
1013
New contributor
Artemis Fowl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
Not golfed it much yet but here's my Python 3 answer at 354 bytes:
EDIT: Now 238 bytes with one space indents and some one-line iterators:
EDIT: 193 bytes with max function
EDIT: 189 bytes removed unnecessary list
def a(b):
a=();c=list(sum(list(list(d[f:e]for f in range(e))for e in range(len(d)+1)),[])for d in b)
for i in c[0]:
if all(i in j for j in c):
a+=(i,)
return max(a,key=len)
answered 46 mins ago
Artemis FowlArtemis Fowl
1013
New contributor
Artemis Fowl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 11 mins ago
answered 46 mins ago
Artemis FowlArtemis Fowl
1013
New contributor
Artemis Fowl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 46 mins ago
Artemis FowlArtemis Fowl
1013
answered 46 mins ago
Artemis FowlArtemis Fowl
1013
1013
New contributor
Artemis Fowl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Artemis Fowl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Artemis Fowl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$begingroup$
You may want to use single spaces as indentation instead of 4 that seems to shave more than 100 bytes.
$endgroup$
– Shieru Asakoto
43 mins ago
$begingroup$
@ShieruAsakoto Oops yeah.
$endgroup$
– Artemis Fowl
36 mins ago
$begingroup$
135 bytes by simplifying thecdeclaration and condensing theforloop. I would recommend adding the title and bytecount to the header, or using TIO's formatter to create the body of your post
$endgroup$
– Jo King
7 mins ago
$begingroup$
102 bytes by using set operators instead
$endgroup$
– Jo King
2 mins ago
add a comment |
$begingroup$
You may want to use single spaces as indentation instead of 4 that seems to shave more than 100 bytes.
$endgroup$
– Shieru Asakoto
43 mins ago
$begingroup$
@ShieruAsakoto Oops yeah.
$endgroup$
– Artemis Fowl
36 mins ago
$begingroup$
135 bytes by simplifying thecdeclaration and condensing theforloop. I would recommend adding the title and bytecount to the header, or using TIO's formatter to create the body of your post
$endgroup$
– Jo King
7 mins ago
$begingroup$
102 bytes by using set operators instead
$endgroup$
– Jo King
2 mins ago
$begingroup$
You may want to use single spaces as indentation instead of 4 that seems to shave more than 100 bytes.
$endgroup$
– Shieru Asakoto
43 mins ago
$begingroup$
You may want to use single spaces as indentation instead of 4 that seems to shave more than 100 bytes.
$endgroup$
– Shieru Asakoto
43 mins ago
$begingroup$
@ShieruAsakoto Oops yeah.
$endgroup$
– Artemis Fowl
36 mins ago
$begingroup$
@ShieruAsakoto Oops yeah.
$endgroup$
– Artemis Fowl
36 mins ago
$begingroup$
135 bytes by simplifying the
c declaration and condensing the for loop. I would recommend adding the title and bytecount to the header, or using TIO's formatter to create the body of your post$endgroup$
– Jo King
7 mins ago
$begingroup$
135 bytes by simplifying the
c declaration and condensing the for loop. I would recommend adding the title and bytecount to the header, or using TIO's formatter to create the body of your post$endgroup$
– Jo King
7 mins ago
$begingroup$
102 bytes by using set operators instead
$endgroup$
– Jo King
2 mins ago
$begingroup$
102 bytes by using set operators instead
$endgroup$
– Jo King
2 mins ago
add a comment |
$begingroup$
JavaScript (Node.js), 114 105 bytes
a=>(F=(l,n,w=a[0].substr(n,l))=>l?n<0?F(--l,L-l):a.some(y=>y.search(w)<0)?F(l,n-1):w:"")(L=a[0].length,0)
Try it online!
Probably still golfable.
y.indexOf must be used in place of y.search if the strings may contain special regex characters, at the cost of 1 more byte.
answered 16 mins ago
Shieru AsakotoShieru Asakoto
2,750317
$endgroup$
add a comment |
$begingroup$
JavaScript (Node.js), 114 105 bytes
a=>(F=(l,n,w=a[0].substr(n,l))=>l?n<0?F(--l,L-l):a.some(y=>y.search(w)<0)?F(l,n-1):w:"")(L=a[0].length,0)
Try it online!
Probably still golfable.
y.indexOf must be used in place of y.search if the strings may contain special regex characters, at the cost of 1 more byte.
answered 16 mins ago
Shieru AsakotoShieru Asakoto
2,750317
$endgroup$
add a comment |
$begingroup$
JavaScript (Node.js), 114 105 bytes
a=>(F=(l,n,w=a[0].substr(n,l))=>l?n<0?F(--l,L-l):a.some(y=>y.search(w)<0)?F(l,n-1):w:"")(L=a[0].length,0)
Try it online!
Probably still golfable.
y.indexOf must be used in place of y.search if the strings may contain special regex characters, at the cost of 1 more byte.
answered 16 mins ago
Shieru AsakotoShieru Asakoto
2,750317
$endgroup$
JavaScript (Node.js), 114 105 bytes
a=>(F=(l,n,w=a[0].substr(n,l))=>l?n<0?F(--l,L-l):a.some(y=>y.search(w)<0)?F(l,n-1):w:"")(L=a[0].length,0)
Try it online!
Probably still golfable.
y.indexOf must be used in place of y.search if the strings may contain special regex characters, at the cost of 1 more byte.
answered 16 mins ago
Shieru AsakotoShieru Asakoto
2,750317
edited 6 mins ago
answered 16 mins ago
Shieru AsakotoShieru Asakoto
2,750317
answered 16 mins ago
Shieru AsakotoShieru Asakoto
2,750317
answered 16 mins ago
Shieru AsakotoShieru Asakoto
2,750317
2,750317
add a comment |
add a comment |
$begingroup$
Brachylog, 3 bytes
sᵛw
Try it online!
Full program.
$endgroup$
add a comment |
$begingroup$
Brachylog, 3 bytes
sᵛw
Try it online!
Full program.
$endgroup$
add a comment |
$begingroup$
Brachylog, 3 bytes
sᵛw
Try it online!
Full program.
$endgroup$
Brachylog, 3 bytes
sᵛw
Try it online!
Full program.
answered 3 mins ago
community wiki
ais523
add a comment |
add a comment |
If this is an answer to a challenge…
…Be sure to follow the challenge specification. However, please refrain from exploiting obvious loopholes. Answers abusing any of the standard loopholes are considered invalid. If you think a specification is unclear or underspecified, comment on the question instead.
…Try to optimize your score. For instance, answers to code-golf challenges should attempt to be as short as possible. You can always include a readable version of the code in addition to the competitive one.
Explanations of your answer make it more interesting to read and are very much encouraged.…Include a short header which indicates the language(s) of your code and its score, as defined by the challenge.
More generally…
…Please make sure to answer the question and provide sufficient detail.
…Avoid asking for help, clarification or responding to other answers (use comments instead).
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$begingroup$
Possible duplicate
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– Adám
1 hour ago
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@Adám That question asks for the longest common subsequence, not substring.
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– Doorknob♦
1 hour ago
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Will the strings be only alphanumeric, or alphabetic, or only printable-ascii?
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– Embodiment of Ignorance
7 mins ago