POJ 1028 Web Navigation

来源：互联网发布：windows 开源shell 编辑：程序博客网时间：2024/05/17 02:14
#include <iostream>#include <cstdio>#include <string>#include <stack>using namespace std;int main(){    stack<string> forward,backward;    string current="http://www.acm.org/";    char command[10],url[75];    while (scanf("%s",command)==1 && command[0]!='Q')    {        if (command[0]=='V')        {            scanf("%s",url);            backward.push(current);            while (!forward.empty())                forward.pop();            current.assign(url);            printf("%s\n",url);        }        else if (command[0]=='B')        {            if (backward.empty())                printf("Ignored\n");            else            {                forward.push(current);                current=backward.top();                backward.pop();                printf("%s\n",current.c_str());            }        }        else        {            if (forward.empty())                printf("Ignored\n");            else            {                backward.push(current);                current=forward.top();                forward.pop();                printf("%s\n",current.c_str());            }        }    }    return 0;}