hdu 2203 亲和串

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http://acm.hdu.edu.cn/showproblem.php?pid=2203

裸的字符串匹配问题

AC代码：

#include <algorithm>#include <iostream>#include <string.h>#include <stdio.h>using namespace std;int next[200010];char s[200010],t[100010];void getnext(){    int i = 0, j = -1, len = strlen(t);    next[0] = -1;    while(i<len){        if(j == -1 || t[i] == t[j]){            i++,j++;            next[i] = j;        }        else            j = next[j];    }}bool KMP(){    int i=0, j=0;    int l1 = strlen(s), l2 = strlen(t);    while(i < l1){        if(j == -1 || s[i] == t[j]){            i++;            j++;        }        else j = next[j];        if(j >= l2) return true;    }    return false;}int main(){//    freopen("in.txt","r",stdin);    while(scanf("%s%s",s,t) == 2){        int l = strlen(s),tmp = l;        for(int i=0; i<tmp; i++)            s[l++] = s[i];        s[l] = '\0';        getnext();        bool ans = KMP();        ans ? cout << "yes\n" : cout << "no\n";    }    return 0;}

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