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 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
size of a matrix using vector c++
// finding size of a square matrix
myVector[0].size();
initialising 2d vector
// Initializing 2D vector "vect" with
// values
vector<vector<int> > vect{ { 1, 2, 3 },
{ 4, 5, 6 },
{ 7, 8, 9 } };
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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