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How to efficiently build a tree from a flat structure?
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123
Store IDs of the objects in a hash table mapping to the specific object. Enumerate through all t...
Does Typescript support the ?. operator? (And, what's it called?)
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Update: it is supported as of TypeScript 3.7 and called Optional chaining: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#optional-chaining
I can't find any reference to it whatsoever in the TypeScript language specification.
As far...
Find the Smallest Integer Not in a List
...ndex - that's the smallest value not in the array. This results in at most 3N comparisons and only uses a few values worth of temporary space.
# Pass 1, move every value to the position of its value
for cursor in range(N):
target = array[cursor]
while target < N and target != array[targe...
Launching Spring application Address already in use
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edited Nov 9 '19 at 13:46
answered Dec 23 '13 at 21:45
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Remove background drawable programmatically in Android
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318
Try this
RelativeLayout relative = (RelativeLayout) findViewById(R.id.widget29);
relative...
Approximate cost to access various caches and main memory?
...anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors?
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How to get number of entries in a Lua table?
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132
You already have the solution in the question -- the only way is to iterate the whole table wit...
How do you use “
...ower(2)
square(2) # -> [1] 4
square(4) # -> [1] 16
cube <- power(3)
cube(2) # -> [1] 8
cube(4) # -> [1] 64
The ability to manage variables at two levels also makes it possible to maintain the state across function invocations by allowing a function to modify variables in the enviro...
What is the minimum I have to do to create an RPM file?
...rog-1.0/etc/toybinprog/
tar -zcvf toybinprog-1.0.tar.gz toybinprog-1.0/
3. Copy to the sources dir
cp toybinprog-1.0.tar.gz SOURCES/
cat <<EOF > SPECS/toybinprog.spec
# Don't try fancy stuff like debuginfo, which is useless on binary-only
# packages. Don't strip binary too
# Be sure bu...