題目
解題思路
代碼
#include<cstdio>
#include<cstring>
#define ll long long
#define lw 200560490131ll
#define xxy 999983
#define N 1000010
#define rep(i,x,y) for (register int i=x;i<=y;i++)
using namespace std;
ll e[N]={0,1},h[N*2],c[N],t;
int a[N],b[N],next[N],pre,n,m,j; char s[N];
int hash(ll k,int n){
ll y=k%xxy;
while (h[y]){
if (h[y]==k) {int x=c[y]; c[y]=n; return x;}
y=(y+1)%1000000;
}
h[y]=k; c[y]=n; return 0;
}
int main(){
rep(i,2,1000000) e[i]=e[i-1]*27%lw;
while (scanf("%s",s+1),s[1]!='$'){
n++; t=0; rep(i,1,strlen(s+1)) t=(t+(s[i]-96)*e[i])%lw;
pre=hash(t,n); a[n]=(pre==0)?pre:n-pre;
}
scanf("\n"); memset(c,0,sizeof(c)),memset(h,0,sizeof(h));
while (scanf("%s",s+1),s[1]!='$'){
m++; t=0; rep(i,1,strlen(s+1)) t=(t+(s[i]-96)*e[i])%lw;
pre=hash(t,m); b[m]=(pre==0)?pre:m-pre;
}
rep(i,2,m) {
while (j&&b[j]!=b[j+1]) j=next[j];
if (b[j]==b[j+1]) j++;
next[i]=j;
}
rep(i,1,n){
while(j&&!(b[j+1]==a[i]||(b[j+1]==0&&a[i]>j))) j=next[j];
if(b[j+1]==a[i]||(b[j+1]==0&&a[i]>j)) j++;
if(j==m) return 0&printf("%d\n",i-m+1);
}
}