function get_keys_for_duplicate_values($my_arr, $clean = false) { if ($clean) { return array_unique($my_arr); } $dups = $new_arr = array(); foreach ($my_arr as $key => $val) { if (!isset($new_arr[$val])) { $new_arr[$val] = $key; } else { if (isset($dups[$val])) { $dups[$val][] = $key; } else { $dups[$val] = array($key); // Comment out the previous line, and uncomment the following … Read more
What do you mean you don’t want to use loops? You’re going to have to iterate over it one way or another. Just take in each item individually and check if it’s in array2 as you go: items = set(array2) found = [i for i in array1 if i in items] Furthermore, depending on how … Read more
I would agree with your approach to override hashCode() and equals() and use something that implements Set. Doing so also makes it absolutely clear to any other developers that the non-duplicate characteristic is required. Another reason – you get to choose an implementation that meets your needs best now: HashSet TreeSet LinkedHashSet and you don’t … Read more
Exclude group: ‘com.google.guava’ from play services related dependencies. For example: compile (‘com.google.android.gms:play-services:8.1.0’){ exclude group: ‘com.google.guava’ } P.S. Before getting your error I’ve faced with a lot of different, so my final dependencies list is: dependencies { compile fileTree(dir: ‘libs’, include: [‘*.jar’]) // Google compile ‘com.google.dagger:dagger:2.0’ apt ‘com.google.dagger:dagger-compiler:2.0’ compile (‘com.google.android.gms:play-services-identity:8.1.0’){ exclude group: ‘com.google.guava’ } compile (‘com.google.android.gms:play-services-plus:8.1.0’){ … Read more
This is where the window function row_number() comes in handy: SELECT s.siteName, s.siteIP, h.date FROM sites s INNER JOIN (select h.*, row_number() over (partition by siteName order by date desc) as seqnum from history h ) h ON s.siteName = h.siteName and seqnum = 1 ORDER BY s.siteName, h.date
import re # Only repeated numbers answer = re.sub(r'(\d)\1+’, r’\1′, ‘12233322155552’) # Any repeated character answer = re.sub(r'(.)\1+’, r’\1′, ‘12233322155552’)
function get_duplicates ($array) { return array_unique( array_diff_assoc( $array, array_unique( $array ) ) ); }
Copy on write as the name suggests means no variable is being copied until something is written; as long as not a single byte is changed in the variable passed around, PHP takes care of avoiding unnecesary duplicates automatically and without the need of using explicit references thanks to this mechanism. This article explains in … Read more
There are a couple ways to check this compile time, but they might not always work for you. Start by inserting a “marker” enum value right before MsgFoo2A. typedef enum { MsgFoo1A = BASE1_VAL, MsgFoo1B, MsgFoo1C, MsgFoo1D, MsgFoo1E, MARKER_1_DONT_USE, /* Don’t use this value, but leave it here. */ MsgFoo2A = BASE2_VAL, MsgFoo2B } FOO; … Read more
Use a collections.Counter() object, then keep only those values with a count of 1: from collections import counter [k for k, v in Counter(lst).items() if v == 1] This is a O(N) algorithm; you just need to loop through the list of N items once, then a second loop over fewer items (< N) to … Read more