158 lines
2.1 KiB
C++
158 lines
2.1 KiB
C++
#ifndef _VECTOR_HPP_
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#define _VECTOR_HPP_
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#include <iostream>
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template <class T>
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class Vector
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{
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private:
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T *_v;
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int _len;
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int _used;
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bool _sorted = false;
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void expand();
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void shrink();
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void adjust();
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public:
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Vector(int len)
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{
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_used = 0;
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_len = len;
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_v = new T[_len];
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for (int i = 0; i < _len; i++)
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{
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_v[i] = NULL;
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}
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}
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Vector()
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{
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_used = 0;
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_len = 10;
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_v = new T[_len];
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}
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~Vector()
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{
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delete[] _v;
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}
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T get(int a) { return _v[a]; }
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T operator[](int i)
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{
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while (i >= _len)
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{
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expand();
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}
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return _v[i];
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}
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//排序搜索，返回秩
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int search(T value);
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//某处更改为某值
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void put(int a, T value);
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void swap(int a, int b);
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int insert(int locate, int value);
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int remove(int locate, int value);
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int remove_sorted(int value);
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int find(int value);
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void bubbleSort();
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void printall();
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int getlen();
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int getused();
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int count(int value);
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void mergeSort(int lo, int hi);
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private:
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void merge(int lo, int mi, int hi);
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};
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template <class T>
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void Vector<T>::put(int a, T value)
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{
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while (a >= _len)
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{
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expand();
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}
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_used++;
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_v[a] = value;
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}
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template <class T>
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int Vector<T>::getused()
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{
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return _used;
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}
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template <class T>
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void Vector<T>::expand()
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{
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int old_len = _len;
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_len = _len * 2;
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T *p = new T[_len];
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for (int i = 0; i < old_len; i++)
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p[i] = _v[i];
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for (int i = old_len; i < _len; i++)
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{
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p[i] = NULL;
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}
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delete[] _v;
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_v = p;
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}
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// template <class T>
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// void Vector<T>::shrink()
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// {
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// _len = _len >> 1;
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// T *p = new T[_len];
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// for (int i = 0; i < _used; i++)
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// p[i] = _v[i];
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// for (int i = _used; i < _len; i++)
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// {
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// p[i] = NULL;
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// }
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// delete[] _v;
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// _v = p;
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// }
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// template <class T>
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// void Vector<T>::adjust()
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// {
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// if (((double)_used / (double)_len) < 0.25)
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// shrink();
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// else if (((double)_used / (double)_len) > 0.75)
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// expand();
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// return;
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// }
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template <class T>
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int Vector<T>::search(T e)
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{
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if (_sorted == false)
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return -1;
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int i = 0;
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for (; i <= _used && _v[i] <= e; i++)
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;
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return i - 1;
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}
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#endif |