"c++ 2D vectors" Code Answer's
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how to make a 2d vector in c++
Tanishq Vyas
on Jun 19, 2020
// Create a vector containing n
//vectors of size m, all u=initialized with 0
vector<vector<int> > vec( n , vector<int> (m, 0)); size of a matrix using vector c++
panda5
on Jun 25, 2020
// finding size of a square matrix
myVector[0].size();Source: stackoverflow.com
how to get size of 2d vector in c++
Depressed Dormouse
on Jun 27, 2020
myVector[
Vector[0, 4, 2, 5],
Vector[1, 4, 2]
];
/*When you call for myVector[1].size() it would return 3 and [0] would return 4.
For the amount of rows (int vectors) in the 2d vector, you can just use myVector.size()
You can run this to see it in actions*/Source: stackoverflow.com
how to take input in 2d vector in c++
Wide-eyed Whale
on Jul 14, 2020
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);
}
}Source: stackoverflow.com
c++ 2D vectors
DeadHack420
on Jul 27, 2020
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;
}
} how to take input in 2d vector in c++
Wide-eyed Whale
on Jul 14, 2020
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.push_back(temp);// I don't know how to push_back here!!
}
}Source: stackoverflow.com
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