c++ vector resize

The resize() function in C++ vector is used to change the size of the vector, either by increasing or decreasing its capacity. When calling resize(), you need to specify the new size of the vector. If the new size is larger than the current size, the additional elements are initialized with a default value or the one provided. If the new size is smaller than the current size, the extra elements are removed from the vector.

Here's a simple example to demonstrate the usage of resize():

#include <iostream>
#include <vector>

int main() {
    std::vector<int> myVector;

    // Resizing the vector to contain 5 elements, each initialized with value 10
    myVector.resize(5, 10);

    // Now the vector contains: [10, 10, 10, 10, 10]

    // Resizing the vector to contain only 3 elements
    myVector.resize(3);

    // Now the vector contains: [10, 10, 10]

    return 0;
}