I have this array of vectors, vectors of pair:
vector<pair<int, int> > adj[V];
How can i copy this to another variable ?
vector<pair<int, int> > adjCopy[V] = adj; //not working;
I also tried using std:copy but is shows that vector(variable size) is inside the array so, cannot copy.
vector<pair<int, int> > adjCopy[V];
std::copy_n(&adj[0], V, &adjCopy[0]); // or std::copy(&adj[0], &adj[0] + V, &adjCopy[0]);
More idiomatic:
vector<pair<int, int> > adjCopy[V];
std::copy_n(begin(adj), V, begin(adjCopy)); // or std::copy(begin(adj), end(adj), begin(adjCopy));
In general, don't use C-arrays, use std::array,
std::array<std::vector<std::pair<int, int> >, V> adj;
auto adjCopy = adj;