📄 data_struct/共享栈.cpp
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#include <iostream>
using namespace std;
template <class T, int N = 1024>
class TwoStack
{
public:
TwoStack() : top1(-1), top2(N) {}
// 第一个栈(左侧)
void Push1(const T &x)
{
if (top1 + 1 == top2)
throw "栈满";
data[++top1] = x;
}
T Pop1()
{
if (Empty1())
throw "栈1为空";
return data[top1--];
}
T Top1() const
{
if (Empty1())
throw "栈1为空";
return data[top1];
}
bool Empty1() const { return top1 == -1; }
int Size1() const { return top1 + 1; }
// 第二个栈(右侧)
void Push2(const T &x)
{
if (top1 + 1 == top2)
throw "栈满";
data[--top2] = x;
}
T Pop2()
{
if (Empty2())
throw "栈2为空";
return data[top2++];
}
T Top2() const
{
if (Empty2())
throw "栈2为空";
return data[top2];
}
bool Empty2() const { return top2 == N; }
int Size2() const { return N - top2; }
// 剩余可用空间
int FreeSpace() const { return top2 - top1 - 1; }
private:
T data[N];
int top1; // 初始 -1,向右增长
int top2; // 初始 N,向左增长