求助！关于模板类！
刚学习C++，编了一个堆的模板类，想以后用着方便，编译和连接都通过了，就是运行没有output，找不到错误，把代码贴出，向各位达人求救！
template<typename _TY, typename _C = vector<_TY> >class heap{public: typedef _C::allocator_type allocator_type; typedef _C::value_type value_type; typedef _C::size_type size_type; explicit heap(const allocator_type& _Al = allocator_type()) : c(_Al) {} allocator_type get_allocator() const {return (c.get_allocator()); } bool empty() const {return c.empty(); } size_type size() const {return c.size(); } size_type parent(size_type i) {return i >> 1; } size_type left(size_type i) {return i << 1; } size_type right(size_type i) {return i<<1 + 1; } void push_back(const value_type &X) {c.push_back(X); } void build_maxheap(); void heapsort(); value_type maximum() const {return c[0]; } void increase_key(size_type, value_type); size_type extract_max(); void insert(value_type); value_type operator[](const size_type index) {return c[index]; }// value_type operator[](const size_type index) const// {return c[index]; }private: _C c; void MaxHeapify(size_type, size_type);};template<typename _TY, typename _C>void heap<_TY, _C>::MaxHeapify(size_type i, size_type length){ size_type l = left(i); size_type r = right(i); size_type largest; if((l < length) &&(c[l]>c[i])) largest = l; else largest = i; if((r < length) &&(c[r]>c[largest])) largest = r; if(largest != i) { value_type temp = c[i]; c[i] = c[largest]; c[largest] = temp; MaxHeapify(largest, length); }}template<typename _TY, typename _C>void heap<_TY, _C>::build_maxheap(){ for(size_type i = c.size()/2; i >= 0; --i) MaxHeapify(i, c.size());}template<typename _TY, typename _C>void heap<_TY, _C>::heapsort(){ build_maxheap(); value_type temp; for(size_type i = c.size()-1; i > 0; --i) { temp = c[0]; c[0] = c[i]; c[i] = temp; MaxHeapify(0, i); }}#include <iostream>#include <vector>#include <ctime>#include <cstdlib>using namespace std;template<typename _TY, typename _C = vector<_TY> >class heap{public: typedef _C::allocator_type allocator_type; typedef _C::value_type value_type; typedef _C::size_type size_type; explicit heap(const allocator_type& _Al = allocator_type()) : c(_Al) {} allocator_type get_allocator() const {return (c.get_allocator()); } bool empty() const {return c.empty(); } size_type size() const {return c.size(); } size_type parent(size_type i) //你的这里错了..注意思考一下 {return (i - 1)>> 1; } size_type left(size_type i) {return (i << 1)+1; } size_type right(size_type i) {return (i<<1) + 2; } void push_back(const value_type &X) {c.push_back(X); } void build_maxheap(); void heapsort(); value_type maximum() const {return c[0]; } void increase_key(size_type, value_type); size_type extract_max(); void insert(value_type); value_type operator[](const size_type index) {return c[index]; } // value_type operator[](const size_type index) const // {return c[index]; }private: _C c; void MaxHeapify(size_type, size_type); };template<typename _TY, typename _C>void heap<_TY, _C>::MaxHeapify(size_type i, size_type length){ size_type l = left(i); size_type r = right(i); size_type largest; if((l < length) &&(c[l]>c[i])) largest = l; else largest = i; if((r < length) &&(c[r]>c[largest])) largest = r; if(largest != i) { value_type temp = c[i]; c[i] = c[largest]; c[largest] = temp; MaxHeapify(largest, length); } }template<typename _TY, typename _C>void heap<_TY, _C>::build_maxheap(){ for(size_type i = c.size()/2; i < 0x80000000; --i) // i 为unsigned 这个条件为永真!!! MaxHeapify(i, c.size());}template<typename _TY, typename _C>void heap<_TY, _C>::heapsort(){ build_maxheap(); value_type temp; for(size_type i = c.size()-1; i > 0; --i) { temp = c[0]; c[0] = c[i]; c[i] = temp; MaxHeapify(0, i); }}int main(){ heap<int> k; srand(time(0)); for (int i = 0; i < 100; ++i) k.push_back(rand()%1000); k.heapsort(); for (int j = 0; j < 100; ++j) cout << k[j] << '\t'; return 0;}