99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
|
/******************************************************************************************[Heap.h]
|
||
|
|
MiniSat -- Copyright (c) 2003-2006, Niklas Een, Niklas Sorensson
|
||
|
|
|
||
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
|
||
|
|
associated documentation files (the "Software"), to deal in the Software without restriction,
|
||
|
|
including without limitation the rights to use, copy, modify, merge, publish, distribute,
|
||
|
|
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
|
||
|
|
furnished to do so, subject to the following conditions:
|
||
|
|
|
||
|
|
The above copyright notice and this permission notice shall be included in all copies or
|
||
|
|
substantial portions of the Software.
|
||
|
|
|
||
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
|
||
|
|
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||
|
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
|
||
|
|
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
|
||
|
|
OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||
|
|
**************************************************************************************************/
|
||
|
|
|
||
|
|
#ifndef BasicHeap_h
|
||
|
|
#define BasicHeap_h
|
||
|
|
|
||
|
|
#include "Vec.h"
|
||
|
|
|
||
|
|
//=================================================================================================
|
||
|
|
// A heap implementation with support for decrease/increase key.
|
||
|
|
|
||
|
|
|
||
|
|
template<class Comp>
|
||
|
|
class BasicHeap {
|
||
|
|
Comp lt;
|
||
|
|
vec<int> heap; // heap of ints
|
||
|
|
|
||
|
|
// Index "traversal" functions
|
||
|
|
static inline int left (int i) { return i*2+1; }
|
||
|
|
static inline int right (int i) { return (i+1)*2; }
|
||
|
|
static inline int parent(int i) { return (i-1) >> 1; }
|
||
|
|
|
||
|
|
inline void percolateUp(int i)
|
||
|
|
{
|
||
|
|
int x = heap[i];
|
||
|
|
while (i != 0 && lt(x, heap[parent(i)])){
|
||
|
|
heap[i] = heap[parent(i)];
|
||
|
|
i = parent(i);
|
||
|
|
}
|
||
|
|
heap [i] = x;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
inline void percolateDown(int i)
|
||
|
|
{
|
||
|
|
int x = heap[i];
|
||
|
|
while (left(i) < heap.size()){
|
||
|
|
int child = right(i) < heap.size() && lt(heap[right(i)], heap[left(i)]) ? right(i) : left(i);
|
||
|
|
if (!lt(heap[child], x)) break;
|
||
|
|
heap[i] = heap[child];
|
||
|
|
i = child;
|
||
|
|
}
|
||
|
|
heap[i] = x;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
bool heapProperty(int i) {
|
||
|
|
return i >= heap.size()
|
||
|
|
|| ((i == 0 || !lt(heap[i], heap[parent(i)])) && heapProperty(left(i)) && heapProperty(right(i))); }
|
||
|
|
|
||
|
|
|
||
|
|
public:
|
||
|
|
BasicHeap(const C& c) : comp(c) { }
|
||
|
|
|
||
|
|
int size () const { return heap.size(); }
|
||
|
|
bool empty () const { return heap.size() == 0; }
|
||
|
|
int operator[](int index) const { return heap[index+1]; }
|
||
|
|
void clear (bool dealloc = false) { heap.clear(dealloc); }
|
||
|
|
void insert (int n) { heap.push(n); percolateUp(heap.size()-1); }
|
||
|
|
|
||
|
|
|
||
|
|
int removeMin() {
|
||
|
|
int r = heap[0];
|
||
|
|
heap[0] = heap.last();
|
||
|
|
heap.pop();
|
||
|
|
if (heap.size() > 1) percolateDown(0);
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// DEBUG: consistency checking
|
||
|
|
bool heapProperty() {
|
||
|
|
return heapProperty(1); }
|
||
|
|
|
||
|
|
|
||
|
|
// COMPAT: should be removed
|
||
|
|
int getmin () { return removeMin(); }
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
//=================================================================================================
|
||
|
|
#endif
|