杭电hdu 1711 Number Sequence

Number Sequence

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 17627    Accepted Submission(s): 7698


Problem Description
Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1], b[2], ...... , b[M] (1 <= M <= 10000, 1 <= N <= 1000000). Your task is to find a number K which make a[K] = b[1], a[K + 1] = b[2], ...... , a[K + M - 1] = b[M]. If there are more than one K exist, output the smallest one.
 

Input
The first line of input is a number T which indicate the number of cases. Each case contains three lines. The first line is two numbers N and M (1 <= M <= 10000, 1 <= N <= 1000000). The second line contains N integers which indicate a[1], a[2], ...... , a[N]. The third line contains M integers which indicate b[1], b[2], ...... , b[M]. All integers are in the range of [-1000000, 1000000].
 

Output
For each test case, you should output one line which only contain K described above. If no such K exists, output -1 instead.
 

Sample Input
   
   
   
   
2 13 5 1 2 1 2 3 1 2 3 1 3 2 1 2 1 2 3 1 3 13 5 1 2 1 2 3 1 2 3 1 3 2 1 2 1 2 3 2 1
 

Sample Output
   
   
   
   
6 -1
 

Source
HDU 2007-Spring Programming Contest 
KMP算法模板题目:

个人详解请看博客置顶,尽我所能的讲解了细节。

#include<stdio.h>
#include<string.h>
using namespace std;
int lena,lenb;
int a[1000005],b[10005];
int next[200000];
void set_naxt()//子串的next数组
{
    int i=0,j=-1;
    next[0]=-1;
    while(i<lenb)
    {
        if(j==-1||b[i]==b[j])
        {
            i++; j++;
            next[i]=j;
        }
        else
        j=next[j];
    }
}

int kmp()
{
    int i=0,j=0;
    set_naxt();
    while(i<lena)
    {
        if(j==-1||a[i]==b[j])
        {
            i++;j++;
        }
        else
        j=next[j];
        if(j==lenb)
        return i-j+1;
    }
    return -1;
}
int main()
{
    int i,t;
    scanf("%d",&t);
    while(t--)
    {
        memset(next,0,sizeof(next));
        scanf("%d%d",&lena,&lenb);
        for(i=0;i<lena;i++)
        scanf("%d",&a[i]);
        for(i=0;i<lenb;i++)
        scanf("%d",&b[i]);
        printf("%d\n",kmp());
    }
}




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