HDU——T 1711 Number Sequence
2017-08-14 20:24
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http://acm.hdu.edu.cn/showproblem.php?pid=1711
Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 29129 Accepted Submission(s): 12254
, 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
. 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 模板练习题
#include <algorithm> #include <cstdio> using namespace std; const int N(1000000+5); const int M(10000+626); int l1,l2,a ,b ,p ; inline void Get_next() { for(int j=0,i=2;i<=l2;i++) { if(j>0&&b[i]!=b[j+1]) j=p[j]; if(b[i]==b[j+1]) j++; p[i]=j; } } inline void kmp() { for(int j=0,i=1;i<=l1;i++) { if(j>0&&a[i]!=b[j+1]) j=p[j]; if(a[i]==b[j+1]) j++; if(j==l2) { printf("%d\n",i-j+1); return ; } } puts("-1"); } int main() { int t;scanf("%d",&t); for(;t--;) { scanf("%d%d",&l1,&l2); for(int i=1;i<=l1;i++) scanf("%d",a+i); for(int i=1;i<=l2;i++) scanf("%d",b+i); Get_next(); kmp(); } return 0; }
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