how to resize 2d vector c++ code example

Example 1: resize two dimensional vector c++

//vector<vector<int>> M;
//int m = number of rows, n = number of columns;
M.resize(m, vector<int>(n));

Example 2: resize 2d vector c++

myVector.resize(row_count, vector<int>(column_count, initialization_value));
//Example1: create a 2D integer vector with 5 rows and 5 columns having "1"
 myVector.resize(5, vector<int>(5, 1));
//Ex2
 myVector.resize(n);
 for (int i = 0; i < n; ++i)
     myVector[i].resize(m);