2d vector

1// Create a vector containing n 
2//vectors of size m, all u=initialized with 0
3vector<vector<int> > vec( n , vector<int> (m, 0));  

1#include <bits/stdc++.h>
2using namespace std;
3int main() 
4{
5  int rows = 2;
6  int cols = 2;
7  int val = 1;
8  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)*/
9  v[0][0] = 5;
10  v[1][1] = 4;
11  cout << v[0][0] << endl; //Output: 5cout << v[1][0] << endl; //Output: 1return 0;}

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>
2using namespace std;
3main() {
4	int r=2,c=3,val=1;
5	vector<vector<int>> v(r,vector<int>(c,val)); 
6	/*
7    2d vector “v[r][c]”;
8    all elements = val; 
9    (default value is 0)
10    */
11	for(int i=0;i<r;i++) 
12		for(int j=0;j<c;j++) 
13  			cout<<v[i][j]<<" ";
14        cout<<endl;
15  	/*
16    1 1 1
17    1 1 1
18    */
19}

1vector<vector<int>> v(row,vector<int>(col,val));