C++ vector resize

When a vector in c++ is resized what happens to the elements of the vector

The C++ function std::vector::resize() changes the size of vector. If n is smaller than current size then extra elements are destroyed.

If n is greater than current container size then new elements are inserted at the end of vector.

If val is specified then new elements are initialed with val.

Source: tutorialspoint.com

C++ vector resize

std::vector<int> vec = {1, 2, 3};
vec.resize(2); // {1, 2}
vec.resize(4); // {1, 2, 0, 0,}
vec.resize(6, 9);  // {1, 2, 0, 0, 9, 9}

3d vector c++ resize

dp.resize(n+1,vector<vector<int>>(n+1,vector<int>(n+1,-1)));

C++ vector extend vector

std::vector<int> a = {1, 2};
std::vector<int> b = {3, 4, 5};
a.insert(a.end(), b.begin(), b.end()); // a = {1, 2, 3, 4, 5}

Resize vector c++

resize (size_type n, const value_type& val);

The resize() method (and passing argument to constructor is equivalent to that)
  
will insert or delete appropriate number of elements to the vector to make it

given size (it has optional second argument to specify their value).

Similar codes

1 vote280 views1 answer
Copy constructor 2d array c++
C++
1 vote310 views1 answer
Google test assert eq float
C++
17 votes316 views4 answers
How to reference a child gameobject unity
C++
4 votes298 views2 answers
C++ function as pointer
C++
4 votes332 views2 answers
How to hide the console c++
C++
3 votes307 views1 answer
Map declaration c++
C++
0 vote317 views1 answer
How to make a substring after certain position
C++
0 vote295 views1 answer
Enter the value of integer n. Print the figure as shown below.(3) Sample input 5 Sample output ***** **** *** ** *
C++
3 votes316 views1 answer
C++ check if string is empty
C++
1 vote304 views1 answer
Arguments to a class instance c++
C++