initialize vector of vector c 2b 2b

1#include <iostream>
2#include <vector>
3 
4#define M 3
5#define N 4
6 
7int main()
8{
9  // specify default value to fill the vector elements
10  int default_value = 1;
11  // first initialize a vector of ints with given default value
12  std::vector<int> v(N, default_value);
13  // Use above vector to initialize the two-dimensional vector
14  std::vector<std::vector<int>> matrix(M, v);
15  
16  return 0;
17}
18

1// Initializing 2D vector "vect" with 
2// values 
3vector<vector<int> > vect{ { 1, 2, 3 }, 
4                           { 4, 5, 6 }, 
5                           { 7, 8, 9 } }; 

1#include <bits/stdc++.h> 
2#include <vector> 
3using namespace std; 
4  
5int main() 
6{ 
7// This vector initializes with the values: 10, 20, and 30
8  vector<int> vect{ 10, 20, 30 }; 
9
10    return 0; 
11} 

1vector<int> vect{ 10, 20, 30 };

1vector<int> a;                                       // empty vector of ints
2vector<int> b (5, 10);                                // five ints with value 10
3vector<int> c (b.begin(),b.end());                     // iterating through second
4vector<int> d (c);                                   // copy of c