i WANT TO KNOW THAT CAN WE USE C++ STL TO MAKE PROJECTS WHICH WILL BE USED ON A LARGE SCALE OR WE USE JUST IN CODING. Source: Windows Que..

#### Category : stl

numpy has an implementation of the unique algorithm that returns : the sorted unique elements of a numpy array (i.e. with no duplicates) In addition, numpy.unique() can also return : the indices of the input array that give the unique values the indices of the unique array that reconstruct the input array The C++ standard ..

I am working on a problem where I calculate the number of possible paths to a lattice of N * N possible options. There have been some mathematical answers that suggest a simple "combinatorics" answer, but I have no experience with combinatorics. Searching around I found this relatively short answer, but it does not make ..

I have vector of strings, and I need to check if the array contains duplicates: std::vector<std::string> data{}; const bool notContainsDuplicates = …; Can I solve this problem with standard library? Source: Windows Que..

I read somewhere saying find() is not thread safe on binary map STL because when other thread is inserting to the map, the map itself is re-balancing, so find() may not return the proper iterator even the entry is indeed in the map. My observation tends to echo this. How about hash map (unordered_map)? I ..

I am working on a problem where I create a program to calculate the number of possible paths to a lattice of N * N possible options. There have been some mathematical answers that suggest a simple "combinatorics" answer, but I have only basic calculus knowledge. When approached with such a question I try to ..

Is there a way, in C++20, to convert an unordered_map to an unordered_set when both have the same hashing function ? Looping over one, and inserting to the other, would rehash the same keys again. I want to avoid this if I can. The only way I can think of, is a custom Hash function ..

I have codes as follow: #include <concepts> //Fibo Begins template <std::unsigned_integral num> struct Fibo { constexpr static std::size_t value = Fibo<num – 1>::value + Fibo<num – 2>::value; }; template <> struct Fibo<1> { constexpr static std::size_t value = 1; }; template <> struct Fibo<2> { constexpr static std::size_t value = 1; }; //Fibo ends Compiler ..

I have a struct MyStruct which have some elements (including int value1), and a std::vector<MyStruct>. How can I pick up all value1 from each MyStruct and have a std::vector<int> which is the vector of value1. No write will be operated on the new vector. The following is possible but the copy is needed. Is there ..

I made the following map to store data from a .log : map<string,pair(int,map<string,int>)>. I manage to store the data but not to retrieve it. What I do is: cout<< "first string: "<< debut->first << " pair (first int): " << debut->second.first << endl; (debut is a constant iterator of a map) With that I get ..

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