https://leetcode-cn.com/problems/repeated-substring-pattern/
class Solution {
public:
void preKmp(int* next, const string& s){
next[0] = -1;
int j = -1;
for(int i = 1;i < s.size(); i++){
while(j >= 0 && s[i] !=s [j+1])
j = next[j];
if(s[i] == s[j+1])
j++;
next[i] = j;
}
}
bool repeatedSubstringPattern(string s) {
if (s.size() == 0) {
return false;
}
int next[s.size()];
preKmp(next, s);
int len = s.size();
if (next[len - 1] != -1 && len % (len - (next[len - 1] + 1)) == 0) {
return true;
}
return false;
}
};
笔者在先后在腾讯和百度从事技术研发多年,利用工作之余重刷leetcode,本文 GitHub:https://github.com/youngyangyang04/leetcode-master 已经收录,欢迎star,fork,共同学习,一起进步。