Resize vector c++

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 vote270 views1 answer
How to traverse a linked list in c++
C++
0 vote250 views2 answers
C++ program to convert celsius to fahrenheit
C++
2 votes251 views1 answer
Allocation an array with new cpp
C++
0 vote272 views1 answer
Use of undeclared identifier '_O_U16TEXT'
C++
1 vote310 views1 answer
Every number is coming thrice except one
C++
2 votes264 views1 answer
C++ custom comparator for elements in set
C++
0 vote263 views1 answer
Flake8 max line length
C++
0 vote338 views1 answer
Dijkstra algorithm in c++ geeksforgeeks
C++
0 vote277 views1 answer
Structure of s void function
C++
0 vote276 views1 answer
C++ foreach vector
C++