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Re:为什么会超时啊。。。。In Reply To:为什么会超时啊。。。。 Posted by:435965344 at 2012-09-14 21:40:17 > #include<iostream>
> #include<cstring>
> using namespace std;
> int next1[1000010];
> char aa[1000010];
> char bb[1000010];
> int n,m;
> void getnext(char a[])
> {
> int i=0,j=-1;
> next1[0]=-1;
> while(i<n)
> {
> if(j==-1 || a[j]==a[i])
> {
> ++j;
> ++i;
> if(a[i]!=a[j]) next1[i]=j;
> else next1[i]=next1[j];
> }
> else
> {
> j=next1[j];
> }
> }
> }
> int KMPindex(char b[],char a[],int pos)
> {
> int i=pos;
> int j=0;
> while(i<m && j<n)
> {
> if(j==-1 || b[i]==a[j])
> {
> ++i;
> ++j;
> }
> else j=next1[j];
> }
> if(j>=n) return i-n+1;
> else return -1;
> }
> int main()
> {
> int x;
> cin>>x;
> while(x--)
> {
> int count=0;
> cin>>aa;
> getchar();
> cin>>bb;
> n=strlen(aa);
> m=strlen(bb);
> getnext(aa);
> for(int i=0;i<m;i++)
> {
> i=KMPindex(bb,aa,i);
> if(i!=-1)
> {
> count++;
> }
> else break;
> }
> cout<<count<<endl;
> }
> return 0;
> }
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