hdu 1022 Train Problem I

栈的应用，一定要注意把栈清空啊，最近刚开始学数据结构，代码有点水，大家不要见怪

#include<iostream>#include<stack>using namespace std;int main(){int n;string in,out;stack<int>root;while(cin>>n>>in>>out){while(root.size()) root.pop();string re="";for(int i=0;i<in.size();i++){root.push(in[i]-'0');re+='1';while(root.size()&&root.top()==out[0]-'0'){root.pop();out.erase(0,1);re+='2';}}if(root.empty()){cout<<"Yes."<<endl;for(int i=0;i<re.size();i++){if(re[i]=='1') cout<<"in"<<endl;else cout<<"out"<<endl;}cout<<"FINISH"<<endl;}else  cout<<"No."<<endl<<"FINISH"<<endl;}return 0;}