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Searching and Inserting in a map with 3 elements in C++


By : user3852248
Date : October 15 2020, 01:19 AM
I wish this help you A map can only map one key type to one data type. If the data contains 2 elements, use a struct or a std::pair.
code :


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Searching for XML tag by value between them and inserting a new tag in shell script


By : Olga Sidorova
Date : March 29 2020, 07:55 AM
may help you . Say I have this test.xml file which has these contents
code :
xmlstarlet ed -a '//p[n="hello"]/r/s' -t elem -n s -v 2.0 input.xml

Inserting and searching for multiple keywords


By : Black Fire
Date : March 29 2020, 07:55 AM
it fixes the issue You will need to implement a one-to-many relationship between your image table and your keyword table. One image can have many keywords. Each row in your keyword table will need to reference a row in the image table through a foreign key. For example:
code :
images

id | asset
---------------
1  | image1.png 
2  | image2.png

keywords

id | image_id | keyword   | category
-----------------------------------------------
1  | 1        | liner     | painting techniques
2  | 1        | wiping    | painting techniques
3  | 1        | scumbling | painting techniques
3  | 2        | oil       | material used

Why does inserting sequential elements in a tree require more time than inserting random elements into a tree?


By : gupta
Date : March 29 2020, 07:55 AM
I hope this helps you . Inserting sequential items( 1,2,3,4...) to a binary tree will cause it to always add the nodes to the same side( left for example ) . When you insert random items you will add nodes randomly left and right.
Adding sequentially will cause the list to behave as a ordinary linked list ( for the sequential items) because new items will have to visit every previously added item and that will take O(n) steps , when adding randomly it will take O( log N) steps on average.

searching csv columns and inserting into mysql


By : young Bruce
Date : March 29 2020, 07:55 AM
I hope this helps . got the solution by myself :). first make two arrays for source columns and destination columns, then make a array for csv header columns, and then search for the header column value in source array and if match found then create a query that contains destination column name and its corresponding value from csv. may b i am not explaining the code well but this solves my problem.
code :
while ( ($data = fgetcsv($handle, 10000, $columnDelimiter) ) !== FALSE )
{
    $number_of_fields = count($data);
    if ($current_row == 1)
    {
    //Header line
        for ($c=0; $c < $number_of_fields; $c++)
        {
            $header_array[$c] = $data[$c];
        }
    }
    else
    {
    //Data line
        $sql_str = '';
        for ($c=0; $c < $number_of_fields; $c++)
        {
            if($key = array_search($header_array[$c],$source_arr)){
                $sql_str .= $dest_arr[$key]." = '".$data[$c]."',";
             }
        }
        $sql_str = "INSERT INTO $destinationTable SET ".trim($sql_str,',');
        mysql_query($sql_str);
    }
    $current_row++;
}

What data structure is the quickest for inserting and searching for elements?


By : Daniel Savarese
Date : March 29 2020, 07:55 AM
wish of those help std::unordered_map is likely to be the best for your purpose, no guarantees. You can "add a key if and only if not already present" just by using operator[].
You'll make one pass over the 2MB splitting into words and counting the frequencies (one lookup in the structure per word). Then use std::partial_sort_copy (the version that takes a comparator) to get the top 255 by frequency count from the unordered_map. You should partial_sort_copy into a vector or array and then use that to write the file.
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