initializing a vector of vectors c++ code example
Example 1: initialize vector of vector c++
#include <iostream>
#include <vector>
#define M 3
#define N 4
int main()
{
// specify default value to fill the vector elements
int default_value = 1;
// first initialize a vector of ints with given default value
std::vector<int> v(N, default_value);
// Use above vector to initialize the two-dimensional vector
std::vector<std::vector<int>> matrix(M, v);
return 0;
}
Example 2: initializing 2d vector
vector<vector<int> > vec( n , vector<int> (m, 0));
Example 3: initialising 2d vector
// Initializing 2D vector "vect" with
// values
vector<vector<int> > vect{ { 1, 2, 3 },
{ 4, 5, 6 },
{ 7, 8, 9 } };