HDU2072 tri树/map/set/字符串hash

lily的好朋友xiaoou333最近很空，他想了一件没有什么意义的事情，就是统计一篇文章里不同单词的总数。下面你的任务是帮助xiaoou333解决这个问题

水题

就是用来试试字符串算法的

tri树

#include <map>
#include <set>
#include <cmath>
#include <queue>
#include <stack>
#include <vector>
#include <string>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <functional>
#define For(i, x, y) for(int i=x; i<=y; i++)
#define _For(i, x, y) for(int i=x; i>=y; i--)
#define Mem(f, x) memset(f, x, sizeof(f))
#define Sca(x) scanf("%d", &x)
#define Scl(x) scanf("%lld",&x);
#define Pri(x) printf("%d\n", x)
#define Prl(x) printf("%lld\n",x);
#define CLR(u) for(int i = 0; i <= N ; i ++) u[i].clear();
#define LL long long
#define ULL unsigned long long
#define mp make_pair
#define PII pair<int,int>
#define PIL pair<int,long long>
#define PLL pair<long long,long long>
#define pb push_back
#define fi first
#define se second
using namespace std;
typedef vector<int> VI;
const double eps = 1e-;
const int maxn = 1e5 + ;
const int INF = 0x3f3f3f3f;
const int mod = 1e9 + ;
inline int read()
{
    int now=;register char c=getchar();
    for(;!isdigit(c);c=getchar());
    for(;isdigit(c);now=now*+c-'',c=getchar());
    return now;
}
int N,M;
string s;
char a[];
int ans,tot;
int tree[maxn][];
int flag[maxn];
void insert(char *str){
    int l = strlen(str);
    int root = ;
    for(int i =  ; i < l; i ++){
        int id = str[i] - 'a';
        if(!tree[root][id]){
            tree[root][id] = ++tot;
        }
        root = tree[root][id];
    }
    if(!flag[root]){
        ans += flag[root] = ;
    }
}
int main()
{
    while(getline(cin,s) && s[] != '#'){
        Mem(tree,);
        Mem(flag,);
        tot = ;
        ans = ;
        stringstream ss(s);
        while(ss >> a){
            insert(a);
        }
        Pri(ans);
    }
    return ;
}
 

map/set

#include <map>
#include <set>
#include <cmath>
#include <queue>
#include <stack>
#include <vector>
#include <string>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <functional>
#define For(i, x, y) for(int i=x; i<=y; i++)
#define _For(i, x, y) for(int i=x; i>=y; i--)
#define Mem(f, x) memset(f, x, sizeof(f))
#define Sca(x) scanf("%d", &x)
#define Scl(x) scanf("%lld",&x);
#define Pri(x) printf("%d\n", x)
#define Prl(x) printf("%lld\n",x);
#define CLR(u) for(int i = 0; i <= N ; i ++) u[i].clear();
#define LL long long
#define ULL unsigned long long
#define mp make_pair
#define PII pair<int,int>
#define PIL pair<int,long long>
#define PLL pair<long long,long long>
#define pb push_back
#define fi first
#define se second
using namespace std;
typedef vector<int> VI;
const double eps = 1e-;
const int maxn = 1e5 + ;
const int INF = 0x3f3f3f3f;
const int mod = 1e9 + ;
inline int read()
{
    int now=;register char c=getchar();
    for(;!isdigit(c);c=getchar());
    for(;isdigit(c);now=now*+c-'',c=getchar());
    return now;
}
int N,M;
string a,s;
int ans = ;
map<string,bool>P;
int main()
{
    while(getline(cin,s) && s[] != '#'){
        P.clear();
        ans = ;
        stringstream ss(s);
        while(ss >> a){
            if(!P[a]){
                ans++;
                P[a] = ;
            }
        }
        Pri(ans);
    }
    return ;
}
 

Hash

#include <map>
#include <set>
#include <cmath>
#include <queue>
#include <stack>
#include <vector>
#include <string>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <functional>
using namespace std;
const int MAXBUF=;char buf[MAXBUF],*ps=buf,*pe=buf+;
inline bool isdigit(const char& n) {return (n>=''&&n<='');}
inline void rnext(){if(++ps==pe)pe=(ps=buf)+fread(buf,sizeof(char),sizeof(buf)/sizeof(char),stdin);}
template <class T> inline bool in(T &ans){
#ifdef VSCode
ans=;T f=;register char c;
do{c=getchar();if ('-'==c)f=-;}while(!isdigit(c)&&c!=EOF);
if(c==EOF)return false;do{ans=(ans<<)+(ans<<)+c-;
c=getchar();}while(isdigit(c)&&c!=EOF);ans*=f;return true;
#endif
#ifndef VSCode
ans =;T f=;if(ps==pe)return false;do{rnext();if('-'==*ps)f=-;}
while(!isdigit(*ps)&&ps!=pe);if(ps==pe)return false;do{ans=(ans<<)+(ans<<)+*ps-;
rnext();}while(isdigit(*ps)&&ps!=pe);ans*=f;return true;
#endif
}const int MAXOUT=;   //*(int(*)[10])p
char bufout[MAXOUT], outtmp[],*pout = bufout, *pend = bufout+MAXOUT;
inline void write(){fwrite(bufout,sizeof(char),pout-bufout,stdout);pout = bufout;}
inline void out_char(char c){*(pout++)=c;if(pout==pend)write();}
inline void out_str(char *s){while(*s){*(pout++)=*(s++);if(pout==pend)write();}}
template <class T>inline void out_int(T x) {if(!x){out_char('');return;}
if(x<)x=-x,out_char('-');int len=;while(x){outtmp[len++]=x%+;x/=;}outtmp[len]=;
for(int i=,j=len-;i<j;i++,j--) swap(outtmp[i],outtmp[j]);out_str(outtmp);}
template<typename T, typename... T2>
inline int in(T& value, T2&... value2) { in(value); return in(value2...); }
#define For(i, x, y) for(int i=x;i<=y;i++)
#define _For(i, x, y) for(int i=x;i>=y;i--)
#define Mem(f, x) memset(f,x,sizeof(f))
#define Sca(x) scanf("%d", &x)
#define Scl(x) scanf("%lld",&x);
#define Pri(x) printf("%d\n", x)
#define Prl(x) printf("%lld\n",x);
#define CLR(u) for(int i=0;i<=N;i++)u[i].clear();
#define LL long long
#define ULL unsigned long long
#define mp make_pair
#define PII pair<int,int>
#define PIL pair<int,long long>
#define PLL pair<long long,long long>
#define pb push_back
#define fi first
#define se second
#define Vec Point
typedef vector<int> VI;
const double eps = 1e-;
const int maxn = 1e6 + ;
const int INF = 0x3f3f3f3f;
const int mod = 1e9 + ;
int N,M,tmp,K;
char str[maxn];
string s;
vector<ULL> P;
ULL Hash(char *p)
{
    ULL h = ;
    ULL g;
    for (; *p; p++)
    {
        h = (h << ) + *p;
        g = h & 0xF0000000;
        if (g)
        {
            h ^= (g >> );
            h ^= g;
        }
    }
    return h;
}
int main()
{
    while(getline(cin,s) && s[] != '#'){
        stringstream ss(s);  P.clear();
        while(ss >> str) P.pb(Hash(str));
        sort(P.begin(),P.end());
        P.erase(unique(P.begin(),P.end()),P.end());
        Pri(P.size());
    }
    #ifdef VSCode
    write();
    system("pause");
    #endif
    return ;
}