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水平不够,,,,w了特别久/****** Submit Status Description Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcdef". If we think of concatenation as multiplication, exponentiation by a non-negative integer is defined in the normal way: a^0 = "" (the empty string) and a^(n+1) = a*(a^n). Input Each test case is a line of input representing s, a string of printable characters. The length of s will be at least 1 and will not exceed 1 million characters. A line containing a period follows the last test case. Output For each s you should print the largest n such that s = a^n for some string a. Sample Input abcd aaaa ababab . Sample Output 1 4 3 Hint This problem has huge input, use scanf instead of cin to avoid time limit exceed. + ********/ #include <iostream> #include<string.h> #include<stdio.h> using namespace std; int next[10000005]; void getnext(char *S,int& R) { int j=0; next[0]=0; for(int i=1; S[i]!='\0'; i++) { while(j>0&&S[i]!=S[j]) { j=next[j-1]; } if(S[i]==S[j]) { j++; } next[i]=j; } } int main() { char S[1000005]; while(scanf("%s",S)&&S[0]!='.') { memset(next,0,sizeof(next)); int R=0; getnext(S,R); int l=strlen(S); int j=next[l-1]; int m=l-j,k=j,B; while(j>0) { if(j==m) { B=1; break; } j=next[j-1]; int n=k-j; if(n!=m) { B=0; break; } k=j; } //cout<<m<<endl; if(B) cout<<l/(m)<<endl; else cout<<"1"<<endl; } return 0; } Followed by:
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