2d vector c++ declaration
vector< vector<int>> a(rows, vector<int> (cols));
2d vector c++ declaration
vector< vector<int>> a(rows, vector<int> (cols));
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));
2d vector
#include <bits/stdc++.h>
using namespace std;
int main()
{
int rows = 2;
int cols = 2;
int val = 1;
vector< vector<int> > v(rows, vector<int> (cols, val)); /*creates 2d vector “v[rows][cols]” and initializes all elements to “val == 1” (default value is 0)*/
v[0][0] = 5;
v[1][1] = 4;
cout << v[0][0] << endl; //Output: 5cout << v[1][0] << endl; //Output: 1return 0;}
size of a matrix using vector c++
// finding size of a square matrix
myVector[0].size();
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