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Given an n×n matrix of real numbers. You are allowed to erase any number (from 0 to n) of rows and any number (from 0 to n) of columns, and after that the sum of the remaining entries is computed. Come up with an algorithm which finds out which rows and...
Started by cseric on
, 15 posts
by 15 people.
Answer Snippets (Read the full thread at stackoverflow):
For n columns there are ....
O(n) Stop when no row or column has a sum less thanWell the brute force method goes something like this:
For n rows there are 2 n subsets.
In the other direction to reflect their new values.
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How does:
1 + 2 + ... + N-1 + N + N + N-1 + ... + 2 + 1 N+1 + N+1 + ... + N+1 + N+1
equal N(N + 1)? Shouldn't it be 4N + 4 or 4(N + 1)?
Started by Brandon on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
I assume your notation means row 1 + row 2 ... .
Because you have N number of (N+1) terms.
It is N(N + 1).
Otherwise you need to fill in the rest of the elided values that the ellipses represent.
If N is 4, sure.
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Hi all,
I've got a web application that matches images to tags, and I need to create a way of dynamically refine results for tag search. However, I cannot find a clean way to make that SQL queries, and that's where I need your help.
The idea is that if...
Started by Alpha on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
I would not use an N-N relation but a text field.
Them with a value that won't occur in tags.
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Ask your Facebook Friends
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First the practical application that led me to the problem:
Given a set of angle measurements v[i] in the range of [0,360) degrees, what is the smallest interval containing all v[i]?
Note: the interval may be on both sides, close around 0.
Abstract description...
Started by Curd on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
Hm, how about following:
normalize all angles to [0, N) sort angles (minimum first) find neigborung be (last; first + N) think that pair is what you need - only use opposite angle to that you found;(3*N)/4) { calculate min and max....
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I need a simple UUID generator. The ID is required to be unique for this single instance. Another requirement is, that it has n hashes coexisting at a time, and being releasable. I don't know wether this fits the UUID concept or not. I allrdy thought ...
Started by soxs060389 on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
This version + other versions can be located at www.boostpro.com
Example :
#include <string> #include <... .
The link is to v13.
I highly recommend this library, it's a boost candidate - we're using it in one of our projects and it works just fine .
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I have a table with 50 columns and 1000s of rows. I want to output the top 5 records for each column. To get 1 record I do:
SELECT MAX(column1), MAX(column2), MAX(column3) FROM table
This gets the top value for each column but how can I get the second...
Started by Peter on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
So you could get the top....
Assuming the greatest five values in each column could occur on distinct rows, you have to do to the same row.
SELECT MAX(column1), MAX(column2), MAX(column3) FROM table LIMIT n
where n = number of times.
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Hi guys,
I found this on the internet. It looks good an interview question.
I guess I got the working correct but programatically I haven't tried it.
SmallestInt
You are given an integer n . Return the smallest integer greater than or equal to n that
...
Started by Amitd on
, 12 posts
by 11 people.
Answer Snippets (Read the full thread at stackoverflow):
(But i believe it should be possible to have a more "intelligent" solution... .
A reasonable solution is to start with max(n,{k-digits long prefix of 1023456789}), and test values with n and count up until the condition is fulfilled.
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I have an unknown number of arrays, each containing an unknown number of words. I want to concatenate the values from each list so that all possible variations of the words are stored to a final array.
For example, if array 1 contains:
dog cat
and array...
Started by hookedonwinter on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
Since you only need($i, $array1, $array2, $array3); echo....
Array3[0] 7 => array1[1], array2[1], array3[1]
All you need is a (integer) index n and a function that "translates" the index to the n th element of the (natural ordered) set.
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When reading a stack trace like:
[FormatException: Input string was not in a correct format.] System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +2755599 System.Number.ParseInt...
Started by dariom on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
(Basically they're taking the place of line numbers, which of course aren't available without the pdbs.)
it is the byte offset into native... .
I believe they're offsets into the code of the method - whether IL or JIT-compiled-assembly bytes, I'm not sure.. .
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Given this data set:
ID Name City Birthyear 1 Egon Spengler New York 1957 2 Mac Taylor New York 1955 3 Sarah Connor Los Angeles 1959 4 Jean-Luc Picard La Barre 2305 5 Ellen Ripley Nostromo 2092 6 James T. Kirk Riverside 2233 7 Henry Jones Chicago 1899...
Started by BlaM on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
Grouping.
BY City to outer query, as people with same birth years would return multiple values.
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