CPP

how to initialized a 2d vector

To be used in DP problems:

vector<vector<int>>dp; //global init

dp = vector<vector<int>>(n,vector<int>(m,0)); // local init for test cases
where,
	n, m = dimensions of matrix

how to initialize 2d vector in c++

#include <iostream>
#include <vector>
#include <algorithm>
 
int main()
{
    std::vector<int> v = {2, 1, 3, 6, 7, 9, 8};
 
    int max = *max_element(v.begin(), v.end());
    int min = *min_element(v.begin(), v.end());
 
    std::cout << min << ", " << max << std::endl;        // 1, 9
 
    return 0;
}

initializing 2d vector

// to make (n rows x m columns) 2D array, all initialized 
// with value 'k' (typeof(k) = T)
vector<vector<T>> vec( n , vector<T> (m, k)); 

how to initialize 2d vector in c++

#include<vector>
#include<algorithm>

// all the  std and main syntax ofcourse.

vector<int> pack = {1,2,3} ;

// To add at the END
pack.push_back(6);       // {1,2,3,6}

//  OR
// To add at BEGGINING 
pack.insert(pack.begin(),6) 	// {6,1,2,3,}		

initialize 2D vector

vector<vector<int> >    v2(8, vector<int>(5));

how to initialize 2d vector in c++

#include<vector>
#include<algorithm>      //**********Have to include THIS...OTHERWISE

sort( vectorName.begin(),vectorName.end() ) ;

initialising 2d vector

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