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HDOJ 2087 KMP算法
阅读量:7002 次
发布时间:2019-06-27

本文共 1700 字,大约阅读时间需要 5 分钟。

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// HDOJ 2087 KMP算法#include
using namespace std;#include
void nextval(char s2[],int next[],int len){ next[1] = 0; int i = 1,j = 0; while(i < len) { if(j == 0 || s2[i] == s2[j]) { ++i; ++j; if(s2[i] != s2[j]) next[i] = j; else next[i] = next[j]; } else j = next[j]; }}int KMP(char s1[],char s2[],int len1,int len2,int next[],int pos){ int i = pos,j = 1; while(i <= len1 && j <= len2) { if(j == 0 || s1[i] == s2[j]) { ++i; ++j; } else j = next[j]; } if(j > len2) return i; else return 0;}int main(){ string s1,s2; while(cin>>s1 && s1 != "#") { cin>>s2; int next[s2.size()+1],c = 0,pp = 0; next[0] = -1; char c1[s1.size()+1],c2[s2.size()+1]; for(int i = 1;i <= s1.size();++i) c1[i] = s1[i-1]; for(int i = 1;i <= s2.size();++i) c2[i] = s2[i-1]; nextval(c2,next,s2.size()); for(int pos = 1;pos <= s1.size();) { pp = KMP(c1,c2,s1.size(),s2.size(),next,pos); if(pp) { ++c; pos = pp; } else break; } cout<
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转载于:https://my.oschina.net/miraclle/blog/93427

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