create a vector of vectors in c++ code example
Example 1: how to create a vector in c++
#include <vector>
using namespace std;
int main()
{
vector<int> vect;
vect.push_back(10);
for (int x : vect)
cout << x << " ";
return 0;
}
Example 2: get values from a vector of vectors c++
#include <iostream>
#include <vector>
using namespace std;
int main()
{
vector<vector<int> > buff;
for(int i = 0; i < 10; i++)
{
vector<int> temp;
for(int j = 0; j < 10; j++)
temp.push_back(i);
buff.push_back(temp);
}
for(int i = 0; i < buff.size(); ++i)
{
for(int j = 0; j < buff[i].size(); ++j)
cout << buff[i][j];
cout << endl;
}
return 0;
}
Example 3: c++ 2D vectors
int main()
{
int row = 5;
int colom[] = { 5, 3, 4, 2, 1 };
vector<vector<int> > vec(row);
for (int i = 0; i < row; i++) {
int col;
col = colom[i];
vec[i] = vector<int>(col);
for (int j = 0; j < col; j++)
vec[i][j] = j + 1;
}
for (int i = 0; i < row; i++) {
for (int j = 0; j < vec[i].size(); j++)
cout << vec[i][j] << " ";
cout << endl;
}
}
Example 4: how to make a vector in c++
#include <vector>
using namespace std;
int main(){
vector<int> v;
return 0;
}