vector

[Solved] Vector iterators incompatible error for a vector holding iterators of another vector

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push_back might cause a reallocation of the data contained in the vector. And that reallocation will make all iterators to the vector invalid. Dereferencing invalid iterators leads to undefined behavior. Indexes into the vector will continue to stay valid, unless you remove elements from the vector. 2 solved Vector iterators incompatible error for a vector … Read more

[Solved] vector a[n] allocated in stack or heap? Difference between the declarations vectora(n) and vectora[n]? [duplicate]

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vector<int> adj[n]; This is not legal C++ code, you are not allowed to declare a dynamicaly sized array on the stack like this. It’s also probably the cause of your issue, as making such a huge allocation on the stack can cause some major issues. You should use the following instead: vector<vector<int>> adj(n); 6 solved … Read more

[Solved] Vector of pointers to vectors

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Given your declarations, you need vecP[1]->resize(6); // or vecP[1]->at(3) = 7; The problem being that since your (top level) vector elements are pointers, you need to dereference them to access their contents. The easiest way of dereferencing is to use -> instead of ., as I did above, but you can also use (unary) *. … Read more

[Solved] Using vectors in c++ [closed]

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There are several things wrong with your program: vector<int> pies[p], racks[p]; Should be: vector<int> pies, racks; The reason is that the first definition declares an array of vector. That certainly can’t be right, unless you really want to declare an array of vectors. What you want to do is declare two vectors that start out … Read more

[Solved] Error trying to swap Card Objects in a vector c++

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To pick out some key lines from you error In instantiation of ‘void std::swap(_Tp&, _Tp&) [with _Tp = Card]’: use of deleted function ‘Card& Card::operator=(Card&&)’ ‘Card& Card::operator=(Card&&)’ is implicitly deleted because the default definition would be ill-formed: non-static const member ‘const int Card::numFace’, can’t use default assignment operator You are trying to use std::swap with … Read more

[Solved] segmentation fault for vector iterator

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In this declaration: vector<int>::iterator rit_i,rit_j,initial = vec.end(); only initial is initialized with vec.end(). To make it do what I think you expect, you have to write vector<int>::iterator rit_i = vec.end(), rit_j = vec.end(), initial = vec.end(); or vector<int>::iterator rit_i,rit_j,initial; rit_i = rit_j = initial = vec.end(); or something to that effect. solved segmentation fault for … Read more

[Solved] C++ : Unable to read from large txt file [closed]

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Your problem is in the merge function: you exceed the local variable c. long c[30]; maybe there are more problems, that is the first I notice. EDIT Try this: find the differences… #include <map> #include <vector> #include <fstream> #include <iostream> #include <time.h> using namespace std; void merge(vector<long> &,long ,long , long ); void divide(vector<long> &arr,long … Read more

[Solved] How to create a vector of complex numbers in c++? [closed]

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Here’s an example I used: double real; double imaginary; std::vector<std::complex<double> > database; //… std::cin >> real; std::cin >> imaginary; const std::complex<double> temp(real, imaginary); database.push_back(temp); In the above example, I read in the real and imaginary components separately. Next, I create a temporary complex object using the real and imaginary components. Finally, I push_back the value … Read more