int n,a,b,c;
cin >> n;
map<int,vector<pair<int,int>>> mv;
for(int i=0;i<n;++i)
{
cin>>a>>b>>c;
mv[a].insert(make_pair(b,c));
}
I m trying to take input from std::vector of std::pair which is in a std::map.Is it possible?
And, how can I iterate through the map?
mv[a].insert(...) is not the right function call. You need to use mv[a].push_back(...). Remember that mv[a] return a reference to the value in the map that corresponds to the key a.
If you divide that line in two, it will make more sense.
int n,a,b,c;
cin >> n;
map<int,vector<pair<int,int>>> mv;
for(int i=0;i<n;++i)
{
cin>>a>>b>>c;
vector<pair<int,int>>& v = mv[a];
v.push_back(make_pair(b,c));
}
v.emplace_back(b,c);.
inserttakes an iterator to indicate where to insert the new element. Perhaps you meantpush_back?