in C++

is this how I declare the 2d dynamic vector?

vector>matrix;

how do i populate the vector ,print it , find the rows and print the major diagnols with 1s

program prompts the user to enter the length if a square matrix, randomly fill in 0s and 1s into the matrix , print the matrix, and find the rows and major diagonal with all 1s

This is what i have so fare but it dosnet track the rows full of 1s or major diagnols with 1s

#include

#include

#include

using namespace std;

int main()

{

srand(time(0)); //this is for random generation

vector > matrix;

int m=0;

cout << " Please enter size of matrix : ";

cin>> m;

//adding elements to 2D vector

for(int i=0; i

{

vector row;

for(int j=0; j

// this will full in random values of 0 and 1

row.push_back(rand()%2); // you can fill in the values here

matrix.push_back(row);

}

//printing the vector

for(int i=0; i

{

for(int j=0; j

cout<

cout<

}

// this will print the diagonal elements from left to right

cout<<"All Rows with 1s, and major diagnols with 1s";

for(int i=0; i

{

for(int j=0; j

{

if(i==j)

cout<<" :"<

}

}

cout << endl;

return 0;

}

in C++