Submission #3401249
Source Code Expand
#include<bits/stdc++.h> using namespace std; long long p=1000000007ll; long long n,k,dp[10001]; long long quickpow(long long a,long long b) { if(b<0) return 1; if(b==0&&n>1) return 1; if(b==0&&n==1) return 0; if(b==1) return a%p; if(b%2==0) { long long t=quickpow(a,b/2); return t*t%p; } else { long long t=quickpow(a,b/2); t=t*t%p; return t*a%p; } } int main(){ cin>>n>>k; dp[0]=1; for(int i=1;i<n;i++) { for(int j=i;j>0;j--) dp[j]=(dp[j+1]+dp[j-1])%p; dp[0]=dp[1]; } cout<<(long long)(dp[n-k]*quickpow(2,n-k-1)%p)<<endl; }
Submission Info
Submission Time | |
---|---|
Task | F - Solitaire |
User | luogu_bot5 |
Language | C++ (GCC 5.4.1) |
Score | 1200 |
Code Size | 600 Byte |
Status | AC |
Exec Time | 32 ms |
Memory | 256 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1200 / 1200 | ||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | 00_example_01.txt, 00_example_02.txt, 00_example_03.txt |
All | 00_example_01.txt, 00_example_02.txt, 00_example_03.txt, 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
00_example_01.txt | AC | 1 ms | 256 KB |
00_example_02.txt | AC | 1 ms | 256 KB |
00_example_03.txt | AC | 32 ms | 256 KB |
01.txt | AC | 1 ms | 256 KB |
02.txt | AC | 10 ms | 256 KB |
03.txt | AC | 1 ms | 256 KB |
04.txt | AC | 1 ms | 256 KB |
05.txt | AC | 1 ms | 256 KB |
06.txt | AC | 1 ms | 256 KB |
07.txt | AC | 1 ms | 256 KB |
08.txt | AC | 1 ms | 256 KB |
09.txt | AC | 29 ms | 256 KB |
10.txt | AC | 1 ms | 256 KB |
11.txt | AC | 1 ms | 256 KB |
12.txt | AC | 28 ms | 256 KB |
13.txt | AC | 1 ms | 256 KB |
14.txt | AC | 31 ms | 256 KB |
15.txt | AC | 3 ms | 256 KB |
16.txt | AC | 32 ms | 256 KB |
17.txt | AC | 32 ms | 256 KB |
18.txt | AC | 32 ms | 256 KB |
19.txt | AC | 32 ms | 256 KB |
20.txt | AC | 32 ms | 256 KB |
21.txt | AC | 1 ms | 256 KB |
22.txt | AC | 32 ms | 256 KB |
23.txt | AC | 32 ms | 256 KB |