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2d vector

By Weary WaspWeary Wasp on Jun 23, 2020 
#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;}

Source: www.quora.com

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size of a matrix using vector c++

By panda5panda5 on Jun 25, 2020 
// finding size of a square matrix
myVector[0].size();

Source: stackoverflow.com

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