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Why is this C code faster than this C++ code ? getting biggest line in file
My guess is that it is a problem with the compiler options you are using, the compiler itself, or the file system. I just now compiled both versions (with optimizations on) and ran them against a 92,000 line text file: c++ version: 113 ms c version: 179 ms And I suspect that the reason that … Read more
Counting palindromic substrings in O(n)
The following site shows an algorithm for computing the longest palindromic substring in O(n) time, and does so by computing the longest palindromic substring at every possible center and then taking the maximum. So, you should be able to easily modify it for your purposes. http://www.akalin.cx/2007/11/28/finding-the-longest-palindromic-substring-in-linear-time/ EDIT: The first link looks a little shaky upon … Read more
Get 0 value from a count with no rows
You need to use the COALESCE function in PostgreSQL http://developer.postgresql.org/pgdocs/postgres/functions-conditional.html Essentially you need to tell SQL how to handle NULLs. i.e. When NULL return 0.
How do I print out the count of unique matches with grep?
See uniq -c. You’ll want to pull out the bit you want, sort the result, pipe thru uniq, sort the output. Something like this maybe: egrep ‘\.[0-9]+:’ output.txt | sort | uniq -c | sort -nr Clarification: I’ve used grep here because it’s not clear what your output.txt format looks like, but you’ll want to … Read more
Counting duplicate values in Pandas DataFrame
You can use groupby with function size. Then I reset index with rename column 0 to count. print df Month LSOA code Longitude Latitude Crime type 0 2015-01 E01000916 -0.106453 51.518207 Bicycle theft 1 2015-01 E01000914 -0.111497 51.518226 Burglary 2 2015-01 E01000914 -0.111497 51.518226 Burglary 3 2015-01 E01000914 -0.111497 51.518226 Other theft 4 2015-01 E01000914 … Read more
How can I count the number of comma separated numbers in a google spreadsheet?
One option is to use the following formula: =COUNT(SPLIT(A1; “,”)) Here’s an example:
Count distinct value pairs in multiple columns in SQL
To get a count of the number of unique combinations of id, name and address: SELECT Count(*) FROM ( SELECT DISTINCT id , name , address FROM your_table ) As distinctified
How to count number of records per day?
select DateAdded, count(CustID) from Responses WHERE DateAdded >=dateadd(day,datediff(day,0,GetDate())- 7,0) GROUP BY DateAdded