SA入门题，将2个串中间用另外的字符链接即可
调了半天一直以为是模板的错，原来是乘法超了intQAQ
不好意思。。传错代码，误认子弟（啪啪啪
1 #include<bits/stdc++.h> 2 #define inc(i,l,r) for(int i=l;i<=r;i++) 3 #define dec(i,l,r) for(int i=l;i>=r;i--) 4 #define link(x) for(edge *j=h[x];j;j=j->next) 5 #define mem(a) memset(a,0,sizeof(a)) 6 #define inf 1e9 7 #define ll long long 8 #define succ(x) (1<<x) 9 #define lowbit(x) (x&(-x)) 10 #define NM 200000+5 11 using namespace std; 12 int read(){ 13 int x=0,f=1;char ch=getchar(); 14 while(!isdigit(ch)){if(ch=='-')f=-1;ch=getchar();} 15 while(isdigit(ch))x=x*10+ch-'0',ch=getchar(); 16 return x*f; 17 } 18 char st[NM]; 19 int n,sa[NM],rank[NM],tmp[NM],top[NM],h[NM],ans,_t; 20 void getsa(){ 21 int m=256;int j; 22 inc(i,0,n)top[rank[i]=(int)st[i]]++; 23 inc(i,1,m)top[i]+=top[i-1]; 24 inc(i,0,n)sa[--top[rank[i]]]=i; 25 for(int k=1;k<=n;k<<=1){ 26 inc(i,0,n){ 27 j=sa[i]-k; 28 if(j<0)j+=n+1; 29 tmp[top[rank[j]]++]=j; 30 } 31 sa[tmp[top[0]=0]]=j=0; 32 inc(i,1,n){ 33 if(rank[tmp[i]]!=rank[tmp[i-1]]||rank[tmp[i]+k]!=rank[tmp[i-1]+k]) 34 top[++j]=i; 35 sa[tmp[i]]=j; 36 } 37 memcpy(rank,sa,sizeof sa);memcpy(sa,tmp,sizeof tmp); 38 } 39 j=0; 40 inc(i,0,n)if(rank[i]){ 41 if(j)j--; 42 while(st[i+j]==st[sa[rank[i]-1]+j])j++; 43 h[rank[i]]=j; 44 } 45 } 46 int main(){ 47 freopen("data.in","r",stdin); 48 scanf("%s",st); 49 _t=n=strlen(st);st[n]='$'; 50 scanf("%s",st+n+1); 51 n=strlen(st);st[n]='$'; 52 getsa(); 53 inc(i,1,n) 54 if((ll)(sa[i]-_t)*(sa[i-1]-_t)<0)ans=max(ans,h[i]); 55 printf("%d ",ans); 56 return 0; 57 }