2d vector

How to make a 2d vector in c++

// Create a vector containing n 
//vectors of size m, all u=initialized with 0
vector<vector<int> > vec( n , vector<int> (m, 0));

Initialising 2d vector

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

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));  /*creates 2d vector “v[rows][cols]” and initializes all elements to “val == 1” (default value is 0)*/
  v[0][0] = 5;
  v[1][1] = 4;
  cout << v[0][0] << endl; //Output: 5cout << v[1][0] << endl; //Output: 1return 0;}

Source: quora.com

2d vector

vector<vector<int>> v(row,vector<int>(col,val));

Similar codes

1 vote189 views1 answer
True/false: the ampersand ( &) is used to dereference a pointer variable in c++.
C++
1 vote228 views1 answer
C++ data structures
C++
2 votes197 views1 answer
C++ custom compare in set
C++
10 votes211 views3 answers
C++ check if file exits
C++
3 votes193 views1 answer
Set precision with fixed c++
C++
0 vote182 views1 answer
Closing a ifstream file c++
C++
0 vote181 views1 answer
Size of a matrix c++
C++
1 vote189 views1 answer
Gfg cyclic array rotation
C++
0 vote194 views1 answer
Life the universe and everything solution c++
C++
-1 vote192 views1 answer
Template function in class c++
C++