A
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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).
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.
For each s you should print the largest n such that s = a^n for some string a.
abcdaaaaababab.
143
This problem has huge input, use scanf instead of cin to avoid time limit exceed.
#include <stdio.h>#include <stdlib.h>#include <string.h>char s[1000005], t[1000005];int next[1000005]; int Kmp(char* s, int n, char* t, int m) { int i = m, j = 0; int ans=0; while(i < n) { if(j == -1 || s[i] == t[j]) { ++i; ++j; if(j == m) { ans++; j=0;} } else return 0; } return ans;}void getnext(char *t, int m) { int i = 0, j = 0; next[0] = -1; j = next[i]; while(i < m) { if(j == -1 || t[i] == t[j]) next[++i] = ++j; else j = next[j]; }}int main(){ while(~scanf("%s",s)) { if(s[0]=='.') break; int n,m,i,j,ans=0; n=strlen(s); strcpy(t,s); for(i=1;i<=(n/2);i++) if(n%i==0) { m=i; getnext(t, m); ans=Kmp(s,n,t,m);if(ans) break; } if(i<=(n/2)) printf("%d\n",ans+1); else printf("1\n"); } return 0;}