2d vecotr code example
Example 1: 2d vector
#include <bits/stdc++.h>
using namespace std;
int main()
{
int rows = 2;
int cols = 2;
int val = 1;
vector< vector<int> > v(rows, vector<int> (cols, val));
v[0][0] = 5;
v[1][1] = 4;
cout << v[0][0] << endl;
Example 2: 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 3: 2d vector
#include <bits/stdc++.h>
using namespace std;
main() {
int r=2,c=3,val=1;
vector<vector<int>> v(r,vector<int>(c,val));
for(int i=0;i<r;i++)
for(int j=0;j<c;j++)
cout<<v[i][j]<<" ";
cout<<endl;
}
Example 4: 2d vector
vector<vector<int>> v(row,vector<int>(col,val));