I have come across a scenario where I am not able to find a way to push a value in the vector which is in the pair. I have made a priority_queue of pair<int, vector<string>> and I want to push values in the vector, for example:
priority_queue<pair<int, vector<string>> pq;
I want to know how to push elements in this priority queue.
You don't have access to the underlying container of a std::priority_queue, so you can't access any of the std::vector elements you store in it, other than the top() element, eg:
priority_queue<pair<int, vector<string>> pq;
pq.push(...);
pq.emplace(...);
...
// use pq.top().second as needed...
You can iterate the strings in the vector in the pair returned by top(), but you can't push_back() more string into the vector since the pair will be const, and thus the vector will also be const.
std::priority_queue is probably not the best container for you to use. Maybe a std::map would make more sense?
map<int, vector<string>> m;
m[1] = vector<string>{"I", "a"};
m[1].push_back(...);