x Dismiss

Join the Stack Overflow Community

Stack Overflow is a community of 6.6 million programmers, just like you, helping each other.
Join them; it only takes a minute:

Sign up

Top Questions

interesting 393 featured hot week month

72

votes

11

answers

7k

views

Sorting in Computer Science vs. sorting in the 'real' world [closed]

algorithm sorting time-complexity

modified yesterday user1952500 3,810

76

votes

4

answers

5k

views

This code hangs in release mode but works fine in debug mode

c#

modified 2 days ago chue x 14.7k

33

votes

11

answers

5k

views

What does just “;” inside an “if” block mean? [closed]

c

modified Jan 12 at 9:04 Marc van Leeuwen 1,922

26

votes

10

answers

3k

views

Does C check if a pointer is out-of-bound without the pointer being dereferenced?

c pointers

answered 16 hours ago supercat 44k

25

votes

12

answers

965

views

Altering trained images to train neural network

machine-learning computer-vision neural-network conv-neural-network training-data

answered 2 days ago Dellein 234

25

votes

5

answers

2k

views

Why would C have “fake arrays”? [on hold]

c arrays

modified yesterday hyde 24.2k

64

votes

1

answer

2k

views

Why is Math.pow() (sometimes) not equal to ** in JavaScript?

javascript google-chrome v8 ecmascript-7

modified 5 hours ago M Hamza Javed 6

22

votes

4

answers

2k

views

C++ safe bool wrapper

c++ boolean

modified 1 hour ago Barry 109k

9

votes

7

answers

1k

views

Store an int in a char buffer in C and then retrieve the same

c++ c

modified Jan 12 at 6:33 Peter A. Schneider 7,576

19

votes

2

answers

1k

views

The 'this' pointer in the initialization list of the constructor

c++ syntax-error this language-lawyer ctor-initializer

modified Jan 13 at 13:29 curiousguy 3,812

20

votes

2

answers

969

views

Why does Math.min([]) evaluate to 0? [closed]

javascript

modified Jan 11 at 22:09 James Monger 2,655

10

votes

5

answers

857

views

Why does malloc() fail when there is enough memory?

c++ c memory malloc

modified Jan 12 at 3:58 ketan 13.3k

13

votes

3

answers

2k

views

In React.js should I make my initial network request in componentWillMount or componentDidMount?

javascript reactjs

modified Jan 12 at 13:00 John Weisz 4,288

27

votes

3

answers

1k

views

Using !s vs. :s to format a string in Python

python string python-3.x string-formatting

modified Jan 13 at 19:54 Jim Fasarakis-Hilliard 33.1k

15

votes

2

answers

1k

views

Is '# -- coding: utf-8 --' also a comment in Python?

python encoding comments

modified 19 hours ago Martijn Pieters♦ 524k

17

votes

4

answers

806

views

How to prevent a template class from being derived more than once?

c++ templates inheritance

modified 6 hours ago Potatoswatter 95.1k

26

votes

1

answer

736

views

Accessing the name of a private-inherited class from a subclass

c++ inheritance

modified Jan 11 at 23:26 Rob 18.2k

11

votes

4

answers

685

views

Using the type of the function in std::function to declare multiple functions of that type

c++ c++11

modified Jan 12 at 12:39 Potatoswatter 95.1k

10

votes

2

answers

1k

views

How does an SQL Exists statement even work if the syntax is wrong?

sql sql-server

modified Jan 12 at 9:07 Tom.Bowen89 2,700

13

votes

4

answers

709

views

Does every c++ member function take `this` as an input implicitly?

c++ performance this language-lawyer member-functions

modified 16 hours ago txtechhelp 3,301

4

votes

9

answers

141

views

Extend an irregular sequence and add zeros to missing values

r

modified Jan 13 at 9:43 Henrik 24.4k

8

votes

4

answers

466

views

Vectorisation of for loop with multiple conditions

r for-loop condition vectorization

modified Jan 12 at 13:55 Martin Morgan 32.2k

9

votes

3

answers

280

views

Executing functions within switch dictionary

python function dictionary

modified 1 hour ago Jim Fasarakis-Hilliard 33.1k

16

votes

4

answers

232

views

Java 8 autoboxing + generics: different behaviour with variable vs. method

java generics java-8 autoboxing

answered 5 hours ago Anil Agrawal 156

14

votes

1

answer

637

views

Why is f(Double x) a better match than f(double… x)? [on hold]

java

modified 2 days ago Tunaki 62.3k

15

votes

1

answer

779

views

Why can't I call operator() on temporary objects directly?

c++ g++

modified Jan 12 at 12:20 fedorqui 116k

19

votes

1

answer

412

views

Why can't decomposition declarations be constexpr?

c++ constexpr c++1z structured-bindings

modified Jan 13 at 11:52 TemplateRex 45.2k

10

votes

2

answers

380

views

How to construct an std::array with index sequence?

c++ arrays c++11 templates c++14

modified yesterday ildjarn 49.7k

15

votes

2

answers

634

views

ArrayList using addAll() compiler shows different behavior with generics [on hold]

java generics java-8

modified 22 hours ago Martijn Pieters♦ 524k

4

votes

7

answers

165

views

Strange thing with C++ memory managment

c++ memory-management

modified 3 hours ago Vlad from Moscow 108k

10

votes

3

answers

617

views

Calculating 1^X + 2^X + … + N^X mod 1000000007

algorithm algebra number-theory mod

modified 1 hour ago Dmitry Bychenko 62.5k

9

votes

2

answers

593

views

Assign value directly to class variable

c#

modified Jan 11 at 12:26 svick 130k

3

votes

10

answers

85

views

How do I check if all the elements in my array occur no more than twice?

arrays ruby

modified 2 days ago vlasiak 149

7

votes

3

answers

714

views

Move item to a list without copying

c++ c++11 move-semantics

answered yesterday Vittorio Romeo 15k

5

votes

4

answers

170

views

takeWhile, dropWhile laziness java9

java scala functional-programming java-stream java-9

modified 2 days ago Tagir Valeev 47.6k

10

votes

2

answers

274

views

Partial template specialization triggering static_asserts

c++ c++11

modified 7 hours ago WhiZTiM 9,632

7

votes

4

answers

270

views

Adding element to 2d arraylist in java

java arraylist

modified Jan 12 at 7:17 user3437460 9,310

1

vote

4

answers

114

views

Any arithmatic operation with NaN should be a NaN

javascript nan

modified Jan 10 at 17:32 Suren Srapyan 7,887

7

votes

3

answers

228

views

Count repetitions of a set of characters

r

modified yesterday Henrik 24.4k

9

votes

2

answers

407

views

Size of base class inside derived class

c++

modified yesterday chi 43.6k

10

votes

2

answers

182

views

Is there a difference between '[:]' and '[::]' when copying a list?

python list python-3.x slice

modified yesterday Jim Fasarakis-Hilliard 33.1k

0

votes

5

answers

141

views

Why does this program print “nine” twice?

c++

modified Jan 13 at 7:04 Saurav Sahu 3,385

5

votes

5

answers

48

views

R: Solve best fit polynomial and plot drop-down lines

r plot regression solver

answered 8 hours ago sandipan 6,271

2

votes

11

answers

100

views

Positioning text inside div

html css

answered Jan 11 at 10:54 Sumer Parveen 84

6

votes

5

answers

216

views

How to display a character at a certain position in a 2d array?

c

answered 2 days ago hmofrad 502

7

votes

4

answers

256

views

Why Won't Visual Studio let me use a Templatized, constexpr Function in enable_if?

c++ c++11 templates visual-studio-2015 constexpr

modified Jan 11 at 18:18 davidhigh 6,820

5

votes

1

answer

850

views

can we use all features of log4j2 if we use it along with slf4j api

java slf4j log4j2

modified Jan 14 at 5:32 Remko Popma 11k

1

vote

2

answers

110

views

What's the best way to make an std::string out of one char? [on hold]

c++ c++11

answered 23 hours ago Richard Hodges 35.4k

1

vote

5

answers

109

views

Java Optional if object is not null - returns the method result, if null - returns default value

java

modified Jan 13 at 12:16 slim 17.4k

3

votes

2

answers

84

views

Why size of int pointer is different of size of int array? [on hold]

c arrays pointers sizeof

modified 59 mins ago Vlad from Moscow 108k

14

votes

2

answers

478

views

Why is my java lambda with a dummy assignment much faster than without it?

java performance lambda

modified 22 hours ago Daniel Lemire 1,705

7

votes

4

answers

117

views

Get a seq() in R with alternating steps

r seq

modified Jan 11 at 13:08 lmo 14.4k

0

votes

1

answer

396

views

Mysql query not working in PHP, works fine in mysql [on hold]

php mysql mysqli

modified yesterday Your Common Sense 114k

2

votes

4

answers

145

views

What does typically happen in C due to stack overflow?

java c error-handling stack-overflow

modified Jan 13 at 19:47 Jean-Baptiste Yunès 14.9k

10

votes

2

answers

133

views

How can I completely flatten a Perl 6 list (of lists (of lists) … )

list flatten perl6

modified Jan 14 at 12:44 Christoph 104k

6

votes

2

answers

254

views

Differentiating alias and real-types at compile time?

c++ c++14 alias

modified Jan 10 at 20:06 Mikel F 1,694

5

votes

5

answers

71

views

Java limit length integer

java validation integer

modified yesterday Lii 3,930

12

votes

1

answer

128

views

IEEE double such that sqrt(x*x) ≠ x

floating-point double ieee-754 square-root

modified 2 days ago Pascal Cuoq 59.5k

9

votes

2

answers

268

views

Are c++ standard library containers like std::queue guaranteed to be reentrant?

c++ multithreading

modified Jan 11 at 17:17 MSalters 111k

4

votes

5

answers

159

views

R: calculate the number of occurrences of a specific event in a specified time future

r date dplyr aggregate

modified Jan 11 at 19:28 David Arenburg 65.5k

3

votes

4

answers

44

views

How to select rows start with some str in pandas?

python pandas

modified 6 hours ago running man 126

1

vote

3

answers

70

views

How to define a function locally in lisp?

lambda lisp common-lisp

modified 2 days ago PuercoPop 2,740

0

votes

3

answers

114

views

in C, what is the maximum amount of identifiers you can have?

c compiler-construction limit interpreter identifier

modified yesterday Jens 38.7k

11

votes

2

answers

241

views

C++17 lambda capture *this

c++ lambda c++1z c++-faq

answered Jan 13 at 15:29 Toby Speight 7,671

9

votes

1

answer

140

views

Why does counting to 2^24 execute quickly, but counting to 2^25 take much longer?

java floating-point

modified Jan 12 at 17:15 resueman 9,675

13

votes

1

answer

173

views

Overloaded function template disambiguation with `std::enable_if` and non-deduced context

c++ templates c++14 language-lawyer overload-resolution

modified Jan 13 at 14:08 TartanLlama 48.5k

8

votes

3

answers

171

views

How to fake “visibility of class” (not of functions) in C++?

c++ visual-studio-2015 class-visibility

modified yesterday javaLover 1,147

2

votes

4

answers

48

views

Including first and last elements in list comprehension

python

answered Jan 13 at 23:55 Rajiv Bakulesh Shah 46

5

votes

4

answers

129

views

Why is TImage rotating my image?

delphi firemonkey timage

modified Jan 13 at 21:02 kobik 14.7k

3

votes

7

answers

100

views

Display text and Dropdown in 2 lines instead of 4 lines

dropdownbox

answered Jan 13 at 6:03 Shahil 962

3

votes

3

answers

97

views

Count Items in an Array of Arrays?

arrays swift

answered Jan 13 at 17:36 Raphael 1,921

0

votes

3

answers

124

views

Does clear() in std::vector generates a memory leak?

c++ c++11 memory-leaks clear stdvector

modified Jan 11 at 16:26 You 12.6k

8

votes

2

answers

122

views

Why is Collections.counter so slow?

python performance collections counter bioinformatics

modified yesterday MSeifert 13.9k

4

votes

4

answers

90

views

Why should you pass a reference instead of a value when passing a derived class object to a function with a base class parameter in C++?

c++

modified Jan 12 at 9:04 Sean Francis N. Ballais 739

7

votes

3

answers

64

views

Clojure: named anonymous function

clojure

modified 20 hours ago tar 826

-1

votes

3

answers

101

views

How to print using recursive in C?

c visual-studio recursion

modified Jan 13 at 15:08 Sergio Formiggini 879

1

vote

6

answers

76

views

Cast differenct object and call a method in same line?

c#

modified Jan 12 at 10:50 Roma 2,514

8

votes

2

answers

262

views

How to display Vietnamese characters in C++?

c++ c++11 locale

modified 2 days ago bRad Gibson 1,028

14

votes

1

answer

157

views

c++ - Implicit conversions with the ternary operator

c++ type-conversion operator-keyword implicit-conversion ternary

modified Jan 14 at 12:12 Holt 16.1k

2

votes

3

answers

74

views

Ordering List Within a List

python python-3.x

modified Jan 13 at 18:35 Iron Fist 7,477

4

votes

5

answers

94

views

Performance for Java Stream.concat VS Collection.addAll

java java-8 java-stream

modified 2 days ago Basil Bourque 44.6k

3

votes

2

answers

1k

views

Angular2 - Cannot set property 'stack' of undefined [on hold]

javascript angular2 typescript

answered yesterday Aleksandar Terziev 38

3

votes

3

answers

143

views

Java 8: Map instead of simple loop

java foreach java-8 java-stream

modified 9 hours ago Pavneet Singh 6,396

0

votes

3

answers

131

views

What is recommended ++ or +1 in C++?

c# c++ c++11 visual-c++

answered 5 hours ago buffjape 2,542

5

votes

3

answers

164

views

Is char the only type with a mandated size?

c++ sizeof

modified 3 hours ago Bo Persson 61.6k

3

votes

4

answers

159

views

CSS3 circle around another circle with space

css3 circle

modified 2 days ago Pangloss 29.1k

1

vote

7

answers

71

views

How to find largest value from multiple ArrayList?

java arraylist

answered 8 hours ago InternetOfThings 3

5

votes

4

answers

55

views

Jquery closing on parent click

javascript jquery

modified 2 days ago Legends 2,245

3

votes

2

answers

88

views

Can any interface with a single method, be considered a Functional Interface?

java lambda java-8 functional-interface

modified Jan 11 at 19:39 Nicolas Filotto 25k

5

votes

3

answers

145

views

How to efficiently find 10 greatest numbers from billions of numbers?

java arrays algorithm

modified 2 days ago Saeed Amiri 18.8k

-3

votes

3

answers

2k

views

Solve a performance issue with a large collection of numbers [on hold]

c#

answered Jan 13 at 16:00 Kevin 3,610

1

vote

5

answers

83

views

Handle != null check for two variable [on hold]

java

modified yesterday Rafa Romero 1,303

3

votes

3

answers

64

views

Controlling Prolog variable value selection

prolog evaluation

modified Jan 13 at 9:59 Isabelle Newbie 945

8

votes

3

answers

135

views

Algorithm for itertools.combinations in Python

python algorithm

modified 2 hours ago Basil C. 46

4

votes

2

answers

217

views

aliasing a std template function

c++ c++1z stdtuple

modified yesterday Andrew 3,572

7

votes

3

answers

271

views

Pretty sfinae with static_assert

c++ templates c++14 sfinae

modified 23 hours ago ildjarn 49.7k

Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.

weekly questions feed

Technology			Life / Arts	Culture / Recreation	Science	Other
Stack Overflow Server Fault Super User Web Applications Ask Ubuntu Webmasters Game Development TeX - LaTeX Software Engineering Unix & Linux Ask Different (Apple) WordPress Development	Geographic Information Systems Electrical Engineering Android Enthusiasts Information Security Database Administrators Drupal Answers SharePoint User Experience Mathematica Salesforce ExpressionEngine® Answers Cryptography	Code Review Magento Signal Processing Raspberry Pi Programming Puzzles & Code Golf more (7)	Photography Science Fiction & Fantasy Graphic Design Movies & TV Music: Practice & Theory Seasoned Advice (cooking) Home Improvement Personal Finance & Money Academia more (8)	English Language & Usage Skeptics Mi Yodeya (Judaism) Travel Christianity English Language Learners Japanese Language Arqade (gaming) Bicycles Role-playing Games Anime & Manga Motor Vehicle Maintenance & Repair more (17)	MathOverflow Mathematics Cross Validated (stats) Theoretical Computer Science Physics Chemistry Biology Computer Science Philosophy more (3)	Meta Stack Exchange Stack Apps Area 51 Stack Overflow Talent

site design / logo © 2017 Stack Exchange Inc; user contributions licensed under cc by-sa 3.0 with attribution required

rev 2017.1.17.24699

Stack Overflow works best with JavaScript enabled