HDU 2087 水KMP

KMP...

#include<iostream>#include<string>#include<cstdlib>#include<cstdio>using namespace  std;char s[1111],t[1111];int next[1111];int lenS,lenT;void setNext(){     int j=1,k=0;     while( j<=lenT )     {            if( k==0||t[j]==t[k] )                next[++j]=++k;            else                k=next[k];     }}int getIndex( int start ){    int i=start,j=1;    while( i<=lenS&&j<=lenT )    {           if( j==0 || s[i]==t[j] )               i++,j++;           else               j=next[j];    }    if( j>lenT ) return i-lenT;    else return 0;}int main(){    while( scanf("%s",&s) )    {           if( strlen(s)==1 && s[0]=='#' )               break;           scanf( "%s",&t );           lenS=strlen(s);           lenT=strlen(t);           for( int i=lenS;i>=1;i-- )                s[i]=s[i-1];           for( int i=lenT;i>=1;i-- )                t[i]=t[i-1];           setNext();                int start=1;int cnt=0;           while( start<lenS )           {                  int pos=getIndex(start);                  if( pos ) cnt++;                  else break;                  start=pos+lenT;           }           printf( "%d\n",cnt );    }    return 0;}