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How can we match a^n b^n with Java regex?
...far easier to understand. The recursive solution is pretty much the direct transformation of the grammar into a regex (actually you could just write it in the grammarized form, it would work).
– NikiC
Sep 19 '11 at 16:04
...
What is the optimal algorithm for the game 2048?
...le row or column is a 16-bit quantity, so a table of size 65536 can encode transformations which operate on a single row or column. For example, moves are implemented as 4 lookups into a precomputed "move effect table" which describes how each move affects a single row or column (for example, the "m...
Creating range in JavaScript - strange syntax
... i, arr);
Number.call(arr[i], i, arr);
Number(i, arr);
Which returns the transformation of i, the current index, to a number.
In conclusion,
The expression
Array.apply(null, { length: 5 }).map(Number.call, Number);
Works in two parts:
var arr = Array.apply(null, { length: 5 }); //1
arr.map(N...
What are the benefits of Java's types erasure?
...y true (a tautology). This is because the correspondence is two-way. The transformation between the type/program and the theorem/proof worlds are mechanical, and can in many cases be automated.
Curry-Howard plays nicely into what we'd like to do with specifications for a program.
Are type systems ...
编译失败！ Error: Your build failed due to an error in the AAPT stage,...
...; [java] INFO: BUILD 1 FINISHED
aia包属性有问题，导致的原因未知，待探索。。。
目前最好的办法就是重新建立一个项目，组件和代码拷贝过来。
Why does GCC generate such radically different assembly for nearly the same C code?
... as signed type is wrongly being used in this code, pretty much all of the transformations the compiler is making here are in cases where the behavior is undefined...
– R.. GitHub STOP HELPING ICE
Jun 9 '14 at 18:24
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What kinds of patterns could I enforce on the code to make it easier to translate to another program
...at you need symbol tables and flow analysis to do good program analysis or transformation. ASTs are necessary but not sufficient. This is the reason that Aho&Ullman's compiler book doesn't stop at chapter 2. (The OP has this right in that he is planning to build additional machinery beyond t...
Objective-C categories in static library
...ybe one day somebody finds my reply and may find it helpful.
The compiler transforms source files (.c, .cc, .cpp, .m) into object files (.o). There is one object file per source file. Object files contain symbols, code and data. Object files are not directly usable by the operating system.
Now whe...
Regular expression to match numbers with or without commas and decimals in text
... There are two functions, according if one wants the numbers '.1245' to be transformed in '0.1245' or not. I wouldn't be surprised if errors or unwanted matchings or unmatchings will remain for certain cases of number strings; then I'd like to know these cases to understand and correct the deficien...
Is Java really slow?
...CPU & system they're running on. JIT provides some very efficient loop transformations this way.
A couple of other historical facts contributed to the "Java is slow" reputation:
Before JIT compilation (Java 1.2/1.3), the language was only interpreted, not compiled, and thus very slow.
JIT co...