how to loop a 2 dimensional vector in c++ starting from second element

Here is an example of how to loop through a 2-dimensional vector in C++ starting from the second element:

#include <iostream>
#include <vector>

int main() {
    std::vector<std::vector<int>> myVector = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

    for (int i = 1; i < myVector.size(); i++) {
        for (int j = 0; j < myVector[i].size(); j++) {
            std::cout << myVector[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}

Explanation:

We start by including the necessary headers <iostream> and <vector>.
We declare a 2-dimensional vector called myVector and initialize it with some values. In this example, we have a vector of vectors where each inner vector represents a row of elements.
We use a nested for loop to iterate over the elements of the vector. The outer loop iterates over the rows (starting from the second row), and the inner loop iterates over the columns of each row.
The outer loop starts from index 1 (i = 1), which corresponds to the second row of the vector. The loop condition i < myVector.size() ensures that we iterate until the last row.
The inner loop starts from index 0 and iterates until the last column of the current row (j < myVector[i].size()).
Inside the inner loop, we access and print the elements of the vector using the indices i and j. In this example, we simply print the elements to the console, but you can perform any desired operations on them.
After printing the elements of each row, we print a newline character std::endl to move to the next line.
Finally, we return 0 to indicate successful program execution.

This code will output the elements of the 2-dimensional vector starting from the second row.