2d vector c++ declaration
vector< vector<int>> a(rows, vector<int> (cols));
2d vector c++ declaration
vector< vector<int>> a(rows, vector<int> (cols));
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));
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;}
how to take input in 2d vector in c++
std::vector<vector<int>> d;
//std::vector<int> d;
cout<<"Enter the N number of ship and port:"<<endl;
cin>>in;
cout<<"Enter preference etc..:n";
for(i=0; i<in; i++){
cout<<"ship"<<i+1<<":"<<' ';
for(j=0; j<in; j++){
cin>>temp;
d[i].push_back(temp);
}
}
c++ 2D vectors
int main()
{
int row = 5; // size of row
int colom[] = { 5, 3, 4, 2, 1 };
vector<vector<int> > vec(row); // Create a vector of vector with size equal to row.
for (int i = 0; i < row; i++) {
int col;
col = colom[i];
vec[i] = vector<int>(col); //Assigning the coloumn size of vector
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;
}
}
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