标签:style io for ar amp size sp on
题解:将原来的串扩展为两倍,然后用KMP匹配。
#include <cstdio> #include <cstring> char str[200005],pat[100005]; int next[100005],N,M; void getnext(){ int i=1,j=0;next[1]=0; while(i<M){ if(j==0||pat[i]==pat[j])next[++i]=++j; else j=next[j]; } } int KMP(){ int i=0,j=0; while(i<=2*N&&j<=M){ if(j==0||str[i]==pat[j])i++,j++; else j=next[j]; }if(j>M)return 1; return 0; } int main(){ while(scanf("%s%s",str+1,pat+1)!=EOF){ str[0]=pat[0]=‘#‘; N=strlen(str)-1; M=strlen(pat)-1; if(N<M){printf("no\n");continue;} for(int i=1;i<=N;i++)str[i+N]=str[i]; str[2*N+1]=‘\0‘;getnext(); printf(KMP()?"yes\n":"no\n"); }return 0; }
标签:style io for ar amp size sp on
原文地址:http://www.cnblogs.com/forever97/p/3927963.html