hdu 1711 Number Sequence KMP模板题

#include<vector>
#include<cmath>
#include<cstring>
#include<algorithm>
#include<string>
#include<cstdio>
#include<iostream>
using namespace std;
typedef long long LL;
const int maxn = 1000005;
const int maxm = 10005;
int n,m,text[maxn],pat[maxm];
int kmp()
{
int next[maxm]={0};
for(int i=1;i<m;++i){
int j=i;
while(j>0){
j=next[j];
if(pat[j]==pat[i]){
next[i+1]=j+1;break;
}
}
}
for(int i=0,j=0;i<n;++i){
if(j<m&&text[i]==pat[j]) j++;
else {
while(j>0){
j=next[j];
if(text[i]==pat[j]){j++;break; }
}
}
if(j==m) return i-m+2;
}
return -1;
}
void solve()
{
scanf("%d%d",&n,&m);
for(int i=0;i<n;i++) scanf("%d",&text[i]);
for(int i=0;i<m;i++) scanf("%d",&pat[i]);
printf("%d\n",kmp());
}
int main()
{
int T;
scanf("%d",&T);
while(T--)
{
solve();
}
return 0;
}

</pre>题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=1711<p></p><p></p><p></p><div class="panel_title" align="left" style="height: 38px; background-image: url(http://acm.hdu.edu.cn/images/panel-title.png); background-color: transparent; padding: 0px 14px; color: rgb(124, 169, 237); font-size: 18px; font-family: Arial; font-weight: bold; background-position: 0% 100%; background-repeat: no-repeat no-repeat;">Problem Description</div><div class="panel_content" style="height: auto; background-image: url(http://acm.hdu.edu.cn/images/panel-content.png); margin: 0px; padding: 0px 20px; font-size: 14px; font-family: 'Times New Roman'; background-repeat: no-repeat repeat;">Given two sequences of numbers : a[1], a[2], ...... , a
, 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.</div><div class="panel_bottom" style="height: auto; margin: 0px; background-image: url(http://acm.hdu.edu.cn/images/panel-bottom.png); font-family: 'Times New Roman';font-size:14px; text-align: -webkit-center; background-position: 0% 0%; background-repeat: no-repeat no-repeat;"> </div><br style="font-family: 'Times New Roman';font-size:14px; text-align: -webkit-center;" /><div class="panel_title" align="left" style="height: 38px; background-image: url(http://acm.hdu.edu.cn/images/panel-title.png); background-color: transparent; padding: 0px 14px; color: rgb(124, 169, 237); font-size: 18px; font-family: Arial; font-weight: bold; background-position: 0% 100%; background-repeat: no-repeat no-repeat;">Input</div><div class="panel_content" style="height: auto; background-image: url(http://acm.hdu.edu.cn/images/panel-content.png); margin: 0px; padding: 0px 20px; font-size: 14px; font-family: 'Times New Roman'; background-repeat: no-repeat repeat;">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
. The third line contains M integers which indicate b[1], b[2], ...... , b[M]. All integers are in the range of [-1000000, 1000000].</div><div class="panel_bottom" style="height: auto; margin: 0px; background-image: url(http://acm.hdu.edu.cn/images/panel-bottom.png); font-family: 'Times New Roman';font-size:14px; text-align: -webkit-center; background-position: 0% 0%; background-repeat: no-repeat no-repeat;"> </div><br style="font-family: 'Times New Roman';font-size:14px; text-align: -webkit-center;" /><div class="panel_title" align="left" style="height: 38px; background-image: url(http://acm.hdu.edu.cn/images/panel-title.png); background-color: transparent; padding: 0px 14px; color: rgb(124, 169, 237); font-size: 18px; font-family: Arial; font-weight: bold; background-position: 0% 100%; background-repeat: no-repeat no-repeat;">Output</div><div class="panel_content" style="height: auto; background-image: url(http://acm.hdu.edu.cn/images/panel-content.png); margin: 0px; padding: 0px 20px; font-size: 14px; font-family: 'Times New Roman'; background-repeat: no-repeat repeat;">For each test case, you should output one line which only contain K described above. If no such K exists, output -1 instead.</div><div class="panel_bottom" style="height: auto; margin: 0px; background-image: url(http://acm.hdu.edu.cn/images/panel-bottom.png); font-family: 'Times New Roman';font-size:14px; text-align: -webkit-center; background-position: 0% 0%; background-repeat: no-repeat no-repeat;"> </div><br style="font-family: 'Times New Roman';font-size:14px; text-align: -webkit-center;" /><div class="panel_title" align="left" style="height: 38px; background-image: url(http://acm.hdu.edu.cn/images/panel-title.png); background-color: transparent; padding: 0px 14px; color: rgb(124, 169, 237); font-size: 18px; font-family: Arial; font-weight: bold; background-position: 0% 100%; background-repeat: no-repeat no-repeat;">Sample Input</div><div class="panel_content" style="height: auto; background-image: url(http://acm.hdu.edu.cn/images/panel-content.png); margin: 0px; padding: 0px 20px; font-size: 14px; font-family: 'Times New Roman'; background-repeat: no-repeat repeat;"><pre style="word-wrap: break-word; white-space: pre-wrap; margin-top: 0px; margin-bottom: 0px;"><div style="font-family: 'Courier New', Courier, monospace;">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</div>

6
-1