hdu 1022 Train Problem I(stack)

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
char str1[30],str2[30];
int sta[30];
int main()
{
    int n;
    int i,j,k;
    int ans[100];
    while(scanf("%d",&n)!=EOF)
    {
        scanf("%s%s",str1,str2);
        memset(ans,0,sizeof(ans));
//        memset(vis,0,sizeof(vis));
        int len1=strlen(str1);
        int len2=strlen(str2);
        int l1=0,l2=0,flag=0,l=0,r=0;
        while(l1<=len1)
        {
            if(flag==len1*2) break;
            if(l==r)
            {
                 sta[r++]=str1[l1++];
                 ans[flag++]=1;
            }
            else if(sta[r-1]!=str2[l2])
            {
                sta[r++]=str1[l1++];
                ans[flag++]=1;
            }
            else if(sta[r-1]==str2[l2])
            {
                l2++;
                r--;
                ans[flag++]=2;
            }
        }
        if(l<r)
        {
            printf("No.\n");
        }
        else
        {
            printf("Yes.\n");
            for(i=0;i<flag;i++)
            {
                if(ans[i]==1) printf("in\n");
                else if(ans[i]==2) printf("out\n");
            }
        }
        printf("FINISH\n");
    }
    return 0;
}

#include<stdio.h>
#include<string.h>
#include<math.h>
#include<iostream>
#include<algorithm>
#include<queue>
#include<stack>
#define mem(a,b) memset(a,b,sizeof(a))
#define ll __int64
#define MAXN 1000
#define INF 0x7ffffff
using namespace std;
char in[20],out[20];
int vis[50];
int main()
{
    int i,j;
    int n;
    int flag;
    while(scanf("%d",&n)!=EOF)
    {
        int ok=1;
        stack <char> q;
        mem(vis,0);
        flag=0;j=0;i=0;
        scanf("%s%s",in,out);
        while(i<n)
        {
            if(!q.empty()&&q.top()==out[i])
            {
                q.pop();
                vis[flag++]=2;
                i++;
            }
            else if(j<n)
            {
                vis[flag++]=1;
                q.push(in[j++]);
            }
            else {ok=0;break;}
        }
        if(!ok) printf("No.\n");
        else
        {
            cout<<"Yes."<<endl;
            for(i=0;i<flag;i++)
            {
                if(vis[i]==1) printf("in\n");
                else if(vis[i]==2) printf("out\n");
            }
        }
        printf("FINISH\n");
    }
    return 0;
}