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

0 vote331 views1 answer
Vs Code cpp not run
C++
11 votes281 views6 answers
How to take input in 2d vector in c++
C++
0 vote298 views1 answer
Replace komma with space C++
C++
0 vote287 views1 answer
C++ exam
C++
1 vote289 views3 answers
Right shift in c++
C++
0 vote312 views1 answer
Stl reverse sort a array
C++
5 votes284 views3 answers
Cpp random number in range
C++
3 votes267 views1 answer
What is a variable in cpp
C++
0 vote290 views1 answer
Matrix dynamic memory c++
C++
2 votes246 views1 answer
First missing integer leetcode
C++