KMP哈哈哈

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int next[1010];
void getnext(int len,string s){
	int i=0,j=-1;
	next[0]=-1;
	while(i<=len){
		if(j==-1||(s[i]==s[j])){
			i++,j++;
			next[i]=j;
		}
		else j=next[j];
	}
}
int KMP(string sy,int lensy,string sp,int lensp){
	int i=0,j=0;
	while(i<lensy&&j<lensp){
		if(j==-1||sy[i]==sp[j]){
			i++,j++;
		}
		else{
			j=next[j];
		}
	}
	return (j==lensp)?(i-lensp):-1;
}
int main(){
	int i,j,k,m,n;
	string st,p;
	ios::sync_with_stdio(false);//cin,cout优化; 
	cin>>st>>p;
	int lenst=st.length()-1,lenp=p.length()-1;
	getnext(lenst,st);//求next数组; 
	n=KMP(st,lenst,p,lenp);//求第几位开始匹配; 
	for(i=0;i<=lenst;i++)cout<<next[i]<<" ";
	cout<<endl<<n<<endl;
	return 0;
}

好久没写博客了,今天上午看了一上午KMP,终于搞懂了,不知道KMP的请看转载的几篇博http://www.tuicool.com/articles/e2Qbyyf


posted @ 2016-11-07 21:50  Drinkwater_cnyali  阅读(130)  评论(0)    收藏  举报