stack
peek operation in stack using javascript
To check the topmost element unfortunately you must explicitly index it var top = stack[stack.length-1]; the syntax stack[-1] (that would work in Python) doesn’t work: negative indexes are valid only as parameters to slice call. // The same as stack[stack.length-1], just slower and NOT idiomatic var top = stack.slice(-1)[0]; To extract an element there is …
What is the difference between a segmentation fault and a stack overflow?
Stack overflow is [a] cause, segmentation fault is the result. At least on x86 and ARM, the “stack” is a piece of memory reserved for placing local variables and return addresses of function calls. When the stack is exhausted, the memory outside of the reserved area will be accessed. But the app did not ask …
Escape analysis in Java
With this version of java -XX:+DoEscapeAnalysis results in far less gc activity and 14x faster execution. $ java -version java version “1.6.0_14” Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode, sharing) $ uname -a Linux xxx 2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36 UTC 2007 i686 GNU/Linux Without escape …
Order of local variable allocation on the stack
I’ve no idea why GCC organizes its stack the way it does (though I guess you could crack open its source or this paper and find out), but I can tell you how to guarantee the order of specific stack variables if for some reason you need to. Simply put them in a struct: void …
Basic Recursion, Check Balanced Parenthesis
First, to your original question, just be aware that if you’re working with very long strings, you don’t want to be making exact copies minus a single letter each time you make a function call. So you should favor using indexes or verify that your language of choice isn’t making copies behind the scenes. Second, …
Does std::array guarantee allocation on the stack only?
TL;DR: yes, it is on the stack. The longer story: C++ has no concept of stack or heap. Those are implementation details, and there is at least one platform that does not use a traditional stack (but rather linked list of heap allocations for it). It has automatic storage and the free store. new accesses …
C++: Stack’s push() vs emplace() [duplicate]
To fully understand what emplace_back does, one must first understand variadic templates and rvalue references. This is a fairly advanced, and deep concept in modern C++. On a map, it would be labeled “there be dragons”. You say that you’re new to C++ and trying to learn this stuff. This may not be the answer …
Parenthesis/Brackets Matching using Stack algorithm
Your code has some confusion in its handling of the ‘{‘ and ‘}’ characters. It should be entirely parallel to how you handle ‘(‘ and ‘)’. This code, modified slightly from yours, seems to work properly: public static boolean isParenthesisMatch(String str) { if (str.charAt(0) == ‘{‘) return false; Stack<Character> stack = new Stack<Character>(); char c; …
Java Stack push() vs add()
Kalyanaraman Santhanam: Edit: Will I encounter any issues if I use add(…) instead of push(…)? Definitly, you will not encounter any issues, because add is part of List interface as well as the Stack, but you should to notice the further readability of your code and your intentions in it by other programmers. push method …