The standard library includes the ordered and the unordered map (std::map and std::unordered_map) containers. In an ordered map the elements are sorted by the key, insert and access is in O(log n). Usually the standard library internally uses red black trees for ordered maps. But this is just an implementation detail. In an unordered map insert and access is in … Read more
Draw a <rect> round the image which is fill=”none”. You can use the stroke of the <rect> as the border.
In simple words, a loop invariant is some predicate (condition) that holds for every iteration of the loop. For example, let’s look at a simple for loop that looks like this: In this example it is true (for every iteration) that i + j == 9. A weaker invariant that is also true is that i >= 0 && … Read more
Primarily for older phones I only encountered the App not installed error when trying to install an apk on my phone which runs on 4.4.2 aka KitKat, but my friend did not encounter this error on his phone which runs on 6+. I tried the other solutions such as removing the old/debug version of the app because … Read more
Summary of existing answers plus my own two cents: 1. Basic answer You can use the header() function to send a new HTTP header, but this must be sent to the browser before any HTML or text (so before the <!DOCTYPE …> declaration, for example). 2. Important details die() or exit() Why you should use die() or exit(): The Daily WTF Absolute or relative URL … Read more
Python 3.10 and above In Python 3.10, they introduced the pattern matching. Example from the Python Docs: Before Python 3.10 While the official docs are happy not to provide switch, I have seen a solution using dictionaries. For example: Then the equivalent switch block is invoked: This begins to fall apart if you heavily depend on fall through.
Instead of forcing an underfull box with \newline, you could simply leave an empty line to start a new paragraph:
Count all the DISTINCT program names by program type and push number DISTINCT COUNT(*) will return a row for each unique count. What you want is COUNT(DISTINCT <expression>): evaluates expression for each row in a group and returns the number of unique, non-null values.
I bet you miss dynamic linker. Just do a You should get an output like this: There are high chances that you system lacks the interpreter (/lib64/ld-linux-x86-64.so.2 in the example). In this case bash would yell No such file or directory, just like when the binary itself is missing. You can try to use a different linker. Sometime you can … Read more
It’s fatal. The remote server has sent you a RST packet, which indicates an immediate dropping of the connection, rather than the usual handshake. This bypasses the normal half-closed state transition. I like this description: “Connection reset by peer” is the TCP/IP equivalent of slamming the phone back on the hook. It’s more polite than merely … Read more