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2d vector c++ declaration Code Example
2d vector c++ declaration 
vector< vector<int>> a(rows, vector<int> (cols));
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



Cpp

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