If you are sure, then it's pretty good solution. C - Can I check in C(++) if an array is all 0 (or false) without iterating/looping over every single value and without allocating a new array of the same size (to use memcmp)? acknowledge that you have read and understood our. Then you can simply combine the any_of() algorithm with a lambda function invoking the bitset member function any() (or similarly for all_of() and all()). Check if Any element in Array matches a condition in C++, Best Courses to Learn Modern C++11, C++17 and C++20, Check if All elements of Array are equal in C++, Check if All elements in Array are in another array in C++, Check if All elements in Array are Zero in C++, Check if All elements in Array are equal to value in C++, Check if all elements in array are false in C++, Check if all elements in array are in string in C++, Check if all elements of Array matches a Condition in C++, Find index of an element in an Array in C++, Find maximum value and its index in an Array in C++. Eg, operate on 64bit ints, or use SSE or AVX intrinsics for 128 or 256 bit operation. The IA32 architecture means a single thread would be best due to the hardware memory streaming. Yes Unique is linear, but it followed on a sort, which is definitely not linear. Thank you for your valuable feedback! The fastest approach is to assume that if the vector contains a single element, it is unique by definition. @JonathanLeffler Thanks, guess I missed it. And simplest, is that most simple for a beginner? 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Who counts as pupils or as a student in Germany? How to insert an item into an array at a specific index? Since the video's . If you know that this is going to be a requirement, you could build a data structure consisting of an array (possibly dynamic) and a count or currently non-zero cells. C++, Fastest way to see how many bytes are equal between fixed length arrays. Check if All elements in Array are true in C++ - thisPointer May I reveal my identity as an author during peer review? Today we learned about several ways to check if all elements in array are true in C++. C#: How to check if all the elements in an array of boolean variables are of the same value (All true or All false)? Check if all values in array are true, then return a true boolean Non-compact manifolds with finite volume and conformal transformation, Looking for story about robots replacing actors, English abbreviation : they're or they're not. Importing a text file of values and converting it to table, English abbreviation : they're or they're not. @RichardPlunkett: If your only expectation is to detect whether there is a unique value or not, you don't need to sort. Fastest way to find out if all elements in a vector are false or true c++? Then, early exit will give orders of magnitude speedup. Was the release of "Barbie" intentionally coordinated to be on the same day as "Oppenheimer"? Am I in trouble? 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Can a creature that "loses indestructible until end of turn" gain indestructible later that turn? I assume I have made a mistake, and that my crude measurements are no longer capturing the computation in the second case. @Noah - we benchmarked that and discarded it at one point because it was horribly slow - reinventing the wheel is sometimes OK if usage is limited and performance is important. With my crude unit measurement skills on a Core i5, this implementation appears to check at a rate of ~0.7 ns per element, which is pretty fast but believable. How do you manage the impact of deep immersion in RPGs on players' real-life? 2,4,6) Same as (1,3,5), but executed according to policy. How to find indices in an std::vector which are true? If such an element is found, every () immediately returns false and stops iterating through the array. Asking for help, clarification, or responding to other answers. Essentially, the same syntax can apply to Java-like languages, including scripting. Airline refuses to issue proper receipt. For example, you have a 15-element array you want to test. Improve this question. Thanks for contributing an answer to Stack Overflow! Is it proper grammar to use a single adjective to refer to two nouns of different genders? I'm wondering how I can achieve if (dead.All(dead[] == true))? If for all the elements the lambda function returns true, then the std::all_of() function will return true. Check if condition for all elements inside an array is true. 4 Are you sure exactly the same elements doesn't mean they are in same order too? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Thanks for contributing an answer to Stack Overflow! so if all of my values in vec are true it returns true? Not the answer you're looking for? How feasible is a manned flight to Apophis in 2029 using Artemis or Starship? Roman languages that use this letter include Catalan, French, Giuliani, Silurian, Occitan, and Portuguese as a variant of the letter C with a cedilla.It is also occasionally used in Crimean Tatar and in Tajikistan (when written in the Latin . @LoveMeow Which syntax? Your email address will not be published. Sharpen your skills, conquer complex algorithms, and stand out in your professional or academic sphere. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. C program - How to check array elements - Stack Overflow What is the smallest audience for a communication that has been deemed capable of defamation? Is it appropriate to try to contact the referee of a paper after it has been accepted and published? 592), How the Python team is adapting the language for an AI future (Ep. Who counts as pupils or as a student in Germany? I wrote "can't do, You are still incorrect, an O(n) operation can be optimized by orders of magnitude. Will the fact that you traveled to Pakistan be a problem if you go to India? a Latin word meaning "about" or "around" . Check all the elements in an array are even using library in C++ @Luchian Grigore ok , i'll edit to add something that's efficient. Conclusions from title-drafting and question-content assistance experiments Can I check a small array of bools in one go? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. will do the trick. Does glide ratio improve with increase in scale? It traverses vector just once and does not mess with the vector content. Check if all elements in an array are true - Blueprint - Epic Developer 592), How the Python team is adapting the language for an AI future (Ep. also if the arrays are small, they will stay in one processor's cache. How do you manage the impact of deep immersion in RPGs on players' real-life? all_of - C++ Users What a pointless thing to say. Well, up-voted it anyway ;), If you find using a decreasing index appealing, I would suggest not using, Great code. If Phileas Fogg had a clock that showed the exact date and time, why didn't he realize that he had arrived a day early? If all is true, all elements in the vector were true. What's the FASTEST way to compare vectors in C++? Im trying to make a last team standing gamemode problem is I need it to check if all players on one team are dead but from all I see we have for each loop and for loop but it returns true if only one element becomes true for now I just want to be able to create the logic to check if all elements in an array are true if yes then return true Conclusions from title-drafting and question-content assistance experiments loop though a array then if and then output result? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Can a simply connected manifold satisfy ? Find a library that's available on your platform that supports threading or parallel-for loops, and split the computation out such that different cores test different ranges of the array. How does Genesis 22:17 "the stars of heavens"tie to Rev. No, you can compare arrays with memcmp, but you can't compare one value against a block of memory. Not the answer you're looking for? How can I add new array elements at the beginning of an array in JavaScript? How can kaiju exist in nature and not significantly alter civilization? For example, the SSE2 intrinsic is _mm_cmpeq_epi32, whose result you'll use with _mm_or_si128. What is the fastest method to check if all elements of an array(preferable integer array) are equal. If Phileas Fogg had a clock that showed the exact date and time, why didn't he realize that he had arrived a day early? if all the numbers are positive, then it will display "All Positive" else "Wrong". By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. rev2023.7.24.43543. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Follow edited Dec 6, 2019 at 13:06. . It would just be much more expensive since it reads another array as well. How can I animate a list of vectors, which have entries either 1 or 0? If you steal opponent's Ring-bearer until end of turn, does it stop being Ring-bearer even at end of turn? This function operates on whole range of array elements and can save time to run a loop to check each elements one by one. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Otherwise it returns 0. int repsEqual(int a[], int len, int n) If a is {3,2,0,5,3} and n is 32053 return 1 because the array contains only the digits of the number in same order as they are in the number. If it's not sorted, no. You don't have to iterate over the entire thing, just stop looping on the first non-zero value. 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Why does ksh93 not support %T format specifier of its built-in printf in AIX? In cell E2, type an equal sign ( = ), and click cell C2. I'm not sure how one evaluates "best" or "simplest." "/\v[\w]+" cannot match every word in Vim. Looking for story about robots replacing actors. How to exert boolean operator in Arrays c#? It just compares the first and second elements of the array and exits immediately. To check if all elements of array are true, we are going to use the STL algorithm std::all_of(). Find centralized, trusted content and collaborate around the technologies you use most. So, why wait? By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. conditionally testing for equality of vector's elements. Obviously, internally, this loops over all values. Departing colleague attacked me in farewell email, what can I do? Your comment suggests there's a better solution using all_of. Different balances between fullnode and bitcoin explorer. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Kill Anything That Moves: The Real American War in Vietnam (American (Bathroom Shower Ceiling), Inverting a matrix using the Matrix logarithm. Compared to other (already proposed) versions: Obviously, it still checks N elements and thus is O(N). Please quote me correctly. yup. Previous comments were predicated on the original version of your question, which was a better start. It is not, I did not have the time to elaborate my answer yet. Is saying "dot com" a valid clue for Codenames? It is a best practice to, prefer algorithm calls to handwritten loops [Herb Sutter - C++ Coding Standards]. Or for a group of developers that eat and sleep C and use pointers regularly? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. calculate number of true (or false) elements in a bool array? In the above code, -6 being a negative element negates the condition and returns false. Checking if all elements of a vector are equal in C++, Test if all elements of a vector are equal. I don't see how this is any 'simpler' than all the other ways posted 4 years earlier. Connect and share knowledge within a single location that is structured and easy to search. Not the answer you're looking for? Share your suggestions to enhance the article. If a is {3,2,0,5,3} and n is 32053 return 1 because the array contains only the digits of the number in same order as they are in the number. C. or c. may refer to: Century, sometimes abbreviated as c. or C., a period of 100 years; Cent (currency), abbreviated c. or , a monetary unit that equals 1 100 of the basic unit of many currencies Caius or Gaius, abbreviated as C., a common Latin praenomen; Circa, abbreviated as c. (or ca., circ., cca, and cc.) be aware that, while the flag can reliably tell that the array contains all false if the flag is false; if the flag is true, it cannot reliably tell if the array does contain a true. Best-case, you reinterpret the memory differently and check more than 1 element at a time, but you still have to check everything until you find one that fails your test. Or possibly, you can make use of the parallism that many GPU's offer. How to Compare Arrays for equality in C++? "/\v[\w]+" cannot match every word in Vim, Importing a text file of values and converting it to table. 6 Ways to check if all values in Numpy Array are zero (in both 1D & 2D document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. To win the game all pictures rotation.z value must be 0. How do I check if an array includes a value in JavaScript? Then i check it with the last character of n thats n%10 Asking for help, clarification, or responding to other answers. I know that I for one at least would rather end it all than die slowly in such an awful manner. That is using C++14 syntax, in an C++11 toolchain you can use the correct type in the lambda. Setting all bits took 36ms, as compared to 1930ms for a vector, about 50x speedup. How feasible is a manned flight to Apophis in 2029 using Artemis or Starship? This alg can be sped up by operating on larger words (using sse), for sake of argument. The some() method tests whether at least one element in the array passes the test implemented by the provided function. In C checking the value of every element and return true or function. It doesn't modify the array. How do I check if two std::vector's contain only the same elements? @Ferruccio Right. To learn more, see our tips on writing great answers. The technical storage or access that is used exclusively for anonymous statistical purposes. How difficult was it to spoof the sender of a telegram in 1890-1920's in USA? Help us improve. Useful array algorithms STL functions This article is contributed by Manjeet Singh . It's also pretty fast in batch operations since it internally uses long values to store the bits and doesn't therefore check every bit separately like we do with boolean[]. Yes that would definitely make it faster. [] (Unicode) C U+0043 c U+0063. This seems to be some homework, haha. Find centralized, trusted content and collaborate around the technologies you use most. Python Program It's still broken - hint: one of the return statements is in the wrong place.
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