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 vote283 views3 answers
Return use in c++
C++
0 vote304 views1 answer
Floor and ceil in cpp
C++
2 votes312 views1 answer
C++ compare strings ignore case
C++
2 votes274 views1 answer
Qstring mid
C++
1 vote313 views1 answer
What are various sections of process
C++
0 vote295 views1 answer
Print all even number using for loop c++
C++
0 vote351 views1 answer
Convert unsigned long to string c++
C++
0 vote284 views1 answer
C++ print binary treenode
C++
1 vote287 views1 answer
Controlling in windows
C++
0 vote310 views1 answer
Power Function in C/C++
C++