uva_644暴力加字典树解法

暴力

#include<iostream>
#include<string.h>
#include<cstdio>
using namespace std;
int main()
{
    int t=0,i=0;
    char s[10][12];
    bool a[12][12];
    memset(s,'',sizeof(s));
    while(scanf("%s",s[i])!=EOF)
    {
        if(s[i][0]=='9')
        {
            t++;
            int state=1;
            memset(a,false,sizeof(a));
            for(int j=0;j<i;j++)
                for(int k=j+1;k<=i;k++)
                for(int l=0;s[j][l]!=''&&s[k][l]!='';l++)
                {if(s[j][l]!=s[k][l])
                {a[j][k]=true;    //cout<<j<<k<<l<<endl;
                }
                    //cout<<j<<k<<l<<endl;
                //cout<<l<<s[k][l]<<endl;
                }
            for(int j=0;j<i;j++)
                for(int k=j+1;k<=i;k++)
                if(a[j][k]==false)
                state=0;
                if(!state)
                    printf("Set %d is not immediately decodable
",t);
            if(state==1)
                printf("Set %d is immediately decodable
",t);
            memset(s,'',sizeof(s));
            i=0;
        }
        else
        i++;
    }
    return 0;
}

字典树

#include<iostream>
#include<string.h>
#include<cstdio>
using namespace std;
int tree[5000][2];
int w[5000];
int numv=0;
char s[10][12];
void insert(char  s[])
{

    int u=0;
    w[0]++;
    int len=strlen(s);
    for(int i=0; i<len; i++)
    {
        if(tree[u][s[i]-'0']==0)
        {
            tree[u][s[i]-'0']=++numv;
        }
        u=tree[u][s[i]-'0'];
        w[u]++;
    }
     //cout<<w[1]<<w[2]<<endl;
}
bool find(char s[])
{
    int u=0;
    int len=strlen(s);
    for(int i=0; i<len; i++)
    {
        u=tree[u][s[i]-'0'];
        //cout<<w[u]<<" "<<u<<s[i]<<endl;
        if(w[u]==1)
        {
            return true;
            break;
        }
    }
    return false;
}
int main()
{
    int t=0,i=0;
    bool a[12];
    memset(s,'',sizeof(s));
    while(scanf("%s",s[i])!=EOF)
    {
        if(s[i][0]=='9')
        {
            numv=0;
            memset(tree,0,sizeof(tree));
            memset(w,0,sizeof(w));
            memset(a,false,sizeof(a));
            t++;
            int state=1;
            for(int j=0; j<i; j++)
                insert(s[j]);
            for(int j=0; j<i; j++)
                if(find(s[j])==true)
                {
                    a[j]=true;
                }

            for(int j=0; j<i; j++)
                if(a[j]==false)
                    {state=0;     //cout<<j<<"as"<<endl;
                    }
            if(!state)
               cout<<"Set "<<t<<" is not immediately decodable"<<endl;
            else
                cout<<"Set "<<t<<" is immediately decodable"<<endl;
            memset(s,'',sizeof(s));
            i=0;
        }
        else
            i++;
    }
    return 0;
}