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#include<vector>
using namespace std;
template <class T=int>
class PriorityQueue
{
private:
vector<int> Key;
vector<T> element;
vector<int>::iterator it;
void insert(const T &value,const int &key ,const int l ,const int h)
{
if( h<=l )
{
if(Key.at(l)>= key )
{
it = element.begin();
//it++;
element.insert(it+l,value);
it = Key.begin();
//it++;
Key.insert(it+l,key);
}
else
{
it = element.begin();
it++;
element.insert(it+l,value);
it = Key.begin();
it++;
Key.insert(it+l,key);
}
}
else
{
int mid = ( l + h ) / 2 ;
if ( Key.at( mid ) == key ) // maybe queue have two element with same Priority
{
it = element.begin();
//it++;
element.insert(it+mid,value);
it = Key.begin();
//it++;
Key.insert(it+mid,key);
}
else if( Key.at( mid ) > key )
{
insert(value,key,l,mid-1 );
}
else if ( Key.at( mid ) < key )
{
insert(value,key,mid+1,h );
}
}
}
public:
PriorityQueue(const PriorityQueue& Copy)
{
Key = Copy.Key;
element = Copy.element;
}
PriorityQueue operator=(const PriorityQueue& Copy)
{
Key = Copy.Key;
element = Copy.element;
return *this;
}
PriorityQueue()
{
}
bool empty()
{
return element.empty();
}
int size()
{
return element.size();
}
void push(const T& value ,const int& key)
{
if(element.empty())
{
element.push_back(value);
Key.push_back(key);
}
else
{
int s= element.size()-1;
insert(value,key,0,s);
}
}
T popLowestPriority()
{
T temp = element.at(0);
it = element.begin();
element.erase(it);
it = Key.begin();
Key.erase(it);
return temp ;
}
T popHighestPriority()
{
T temp = element.back();
element.pop_back();
Key.pop_back();
return temp ;
}
void changePriority(T value , int newKey)
{
it = element.begin();
int elementSize = element.size();
for( int i = 0 ; i < elementSize ; i++ )
{
if( element.at( i ) == value )
{
element.erase( it+i);
it = Key.begin();
Key.erase(it+i);
this->push(value,newKey);
}
}
}
};
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