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2d array using vector Code Example
how to make a 2d vector in c++ 
// Create a vector containing n 
//vectors of size m, all u=initialized with 0
vector<vector<int> > vec( n , vector<int> (m, 0));
size of a matrix using vector c++ 
// finding size of a square matrix
myVector[0].size();
Source: stackoverflow.com
how to get size of 2d vector in c++ 
myVector[
  Vector[0, 4, 2, 5],
  Vector[1, 4, 2]
];

/*When you call for myVector[1].size() it would return 3 and [0] would return 4.

For the amount of rows (int vectors) in the 2d vector, you can just use myVector.size()

You can run this to see it in actions*/
Source: stackoverflow.com
2d array using vector 
// CPP program
#include <iostream>
#include <vector>
using namespace std;
int main()
{
    int n = 4;
    int m = 5;
 
    /*
    Create a vector containing "n"
    vectors each of size "m".
    */
    vector<vector<int>> vec( n , vector<int> (m));
 
    for(int i = 0; i < n; i++)
    {
        for(int j = 0; j < m; j++)
        {
            vec[i][j] = j + i + 1;
        }
    }
 
    for(int i = 0; i < n; i++)
    {
        for(int j = 0; j < m; j++)
        {
            cout << vec[i][j] << " ";
        }
        cout << endl;
    }
     
   return 0;
}
Source: www.geeksforgeeks.org



Cpp

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Type:
 Code Example
Category:
 Coding
Sub Category:
 Code Example
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