hdu-1686-Oulipo(KMP)
2017-11-25 12:20
465 查看
Oulipo
Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 16577 Accepted Submission(s): 6640
Problem Description
The French author Georges Perec (1936–1982) once wrote a book, La disparition, without the letter 'e'. He was a member of the Oulipo group. A quote from the book:
Tout avait Pair normal, mais tout s’affirmait faux. Tout avait Fair normal, d’abord, puis surgissait l’inhumain, l’affolant. Il aurait voulu savoir où s’articulait l’association qui l’unissait au roman : stir son tapis, assaillant à tout instant son imagination,
l’intuition d’un tabou, la vision d’un mal obscur, d’un quoi vacant, d’un non-dit : la vision, l’avision d’un oubli commandant tout, où s’abolissait la raison : tout avait l’air normal mais…
Perec would probably have scored high (or rather, low) in the following contest. People are asked to write a perhaps even meaningful text on some subject with as few occurrences of a given “word” as possible. Our task is to provide the jury with a program that
counts these occurrences, in order to obtain a ranking of the competitors. These competitors often write very long texts with nonsense meaning; a sequence of 500,000 consecutive 'T's is not unusual. And they never use spaces.
So we want to quickly find out how often a word, i.e., a given string, occurs in a text. More formally: given the alphabet {'A', 'B', 'C', …, 'Z'} and two finite strings over that alphabet, a word W and a text T, count the number of occurrences of W in T. All
the consecutive characters of W must exactly match consecutive characters of T. Occurrences may overlap.
Input
The first line of the input file contains a single number: the number of test cases to follow. Each test case has the following format:
One line with the word W, a string over {'A', 'B', 'C', …, 'Z'}, with 1 ≤ |W| ≤ 10,000 (here |W| denotes the length of the string W).
One line with the text T, a string over {'A', 'B', 'C', …, 'Z'}, with |W| ≤ |T| ≤ 1,000,000.
Output
For every test case in the input file, the output should contain a single number, on a single line: the number of occurrences of the word W in the text T.
Sample Input
3
BAPC
BAPC
AZA
AZAZAZA
VERDI
AVERDXIVYERDIAN
Sample Output
1
3
0
题意:看样例都能看懂
KMP模板
code:
#include<cstdio> #include<cstring> #define MAXN 1000010 #define LEN 1000010 using namespace std; int next[MAXN]; char a[MAXN],b[LEN]; int n,m; void get_next() { int k=-1,j=0; next[0]=-1; while(j<m){ if(k==-1||a[j]==a[k]){ k++;j++; next[j]=k; }else k=next[k]; } } int kmp() { int ans=0,i=0,j=0; while(i<n){ if(j==-1||a[j]==b[i]){ i++;j++; }else j=next[j]; if(j==m){ ans++; j=next[j]; } } return ans; } int main() { int t; scanf("%d",&t); while(t--){ scanf("%s%s",a,b); n = strlen(b); m = strlen(a); get_next(); printf("%d\n",kmp()); } return 0; }
相关文章推荐
- HDU - 1711 - Number Sequence,1686 - Oulipo,2087 - 剪花布条,3746 - Cyclic Nacklace (KMP基础)
- Oulipo (poj 3461&&hdu 1686) KMP
- HDU 1686 Oulipo (KMP查找可交叉区间模式串)
- hdu 1686 Oulipo(kmp)
- hdu 1686 Oulipo 裸的KMP
- HDU-1686-Oulipo KMP
- HDU 1686Oulipo (kmp模板题)
- HDU-1686 Oulipo (kmp)
- Oulipo (poj 3461&&hdu 1686) KMP
- HDU- KMP模板题 - 1686 Oulipo - 2087 剪花布条 - 3746 Cyclic Nacklace
- HDU 1686 Oulipo(kmp)
- hdu1686 Oulipo【kmp】
- hdu 1686 Oulipo【kmp】
- hdu 1686 Oulipo (KMP模板)
- HDU 1686 Oulipo KMP入门
- HDU 1686 (KMP模式串出现的次数) Oulipo
- HDU 1686 Oulipo(KMP)
- HDU-1686 Oulipo(kmp模板题)
- 【kmp字符串匹配】hdu 1686 Oulipo
- HDU-1686-Oulipo(KMP)