洛谷P3370 【模板】字符串哈希

一定要记住HASH链表的高端写法！！！
参考了ywq大佬的写法，原来的自己乱搞版WA了70分……

#include
#include
#include
using namespace std;
#define ull unsigned long long
const int base1=1000007,base2=99859,MOD=69847;
int cnt=0,len;
int head[MOD+2],nxt[10000+5],etot;
char s[1505]; 
struct node{
	ull f,s;
}val[10000+5];
int ha(int from,ull hash1,ull hash2)
{
	for(int i=head[from];i;i=nxt[i])
		if(val[i].f==hash1&&val[i].s==hash2) return 0;
	val[++etot].f=hash1,val[etot].s=hash2;
	nxt[etot]=head[from];
	head[from]=etot;
	return 1;
}
void Hash(int len)
{
	ull hash1=1,hash2=1;
	for(int i=1;i<=len;i++){
		hash1=(hash1+s[i])*base1;
		hash2=hash1*base2;
	}
	cnt+=ha((hash2%MOD+MOD)%MOD,hash1,hash2);
}
int main()
{
	int n;
	scanf("%d",&n);
	for(int i=1;i<=n;i++){
		scanf("%s",s);
		len=strlen(s);
		Hash(len);
	}
	printf("%d",cnt);
	return 0;
}

ywq大佬的原版

#include
#define uint unsigned int
using namespace std;

const int N = 10000 + 10;
const int M = 1500 + 10;
const int mod = 10000007;

int n,cnt=0;
char s[M];

struct node{
    int pre;
    uint hash1,hash2;
}stb[N];

int num=0,head[mod+3];
int link(int from,uint hash1,uint hash2){
    for(int i=head[from];i;i=stb[i].pre)
        if(stb[i].hash1==hash1&&stb[i].hash2==hash2) return 0;
    stb[++num].pre=head[from],stb[num].hash1=hash1,stb[num].hash2=hash2;
    head[from]=num;
    return 1;
}

void hash(int len){
    uint seed=31,hash1=0;
    for(int i=0;i>5)));
        else hash2^=((hash2<<7)^s[i]^(hash2>>3));
    }
    cnt+=link(hash1%mod,hash1,hash2);
}

int main(){
    scanf("%d",&n);
    while(n--){
        scanf("%s",s);
        int len=strlen(s);
        hash(len);
    }
    printf("%d\n",cnt);
    return 0;
}