海涛老师的面试题-作业22-栈的压入、弹出序列

题目：输入两个整数序列，第一个序列表示栈的压入顺序，判断第二个序列是否是该栈的弹出顺序，假设压入栈的所有数字均不相等，例如序列 1 2 3 4 5 是压栈顺序，而4 5 3 2 1是该压栈的序列对应的一个弹出序列，但是 4  3 5 1 2 不可能是该压栈序列的弹出序列

// 栈的压入弹出顺序.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <stack>
#include <iostream>
using namespace std;


bool IsPopOrder(const int* pPush,const int* pPop,int nLength)
{
    bool bPossible=false;

    if(pPush&&pPop&&nLength>0)
    {
        const int* pNextPush=pPush;
        const int* pNextPop=pPop;
        stack<int>  stack;    
        while(pNextPop-pPop<nLength)
        {
            while(stack.empty()||stack.top()!=*pNextPop)
            {
                if(pNextPush-pPush==nLength)
                    break;
                stack.push(*pNextPush);
                pNextPush++;
            }
            if(stack.top()!=*pNextPop)
                break;
            stack.pop();
            pNextPop++;
        }
        if(stack.empty()&&pNextPop-pPop==nLength)
            bPossible=true;
    }
    return bPossible;
}


void Test1()
{
    int arr[]={1,2,3,4,5};
    int brr[]={4,5,3,2,1};
    int crr[]={4,3,5,1,2};
    bool a_bOrder=IsPopOrder(arr,brr,5);
    bool a_cOrder=IsPopOrder(arr,crr,5);
    int temp=a_bOrder*2+a_cOrder;
    switch(temp)
    {
    case 0:
        cout<<"Both are Not sequence!"<<endl;
        break;
    case 1:
        cout<<"crr  are  The sequence!"<<endl;
        break;
    case 2:
        cout<<"brr  are  The sequence!"<<endl;
        break;
    case 3:
        cout<<"Both are sequence !"<<endl;
        break;
    default:
        break;
    }
}


int _tmain(int argc, _TCHAR* argv[])
{
    Test1();
    return 0;
}