Submission #2211285
Source Code Expand
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
const int mod=1e9+7;
int n,m,K,f[4005][2005][2],sum[4005];
int add(int a,int b){return a+b>=mod?a+b-mod:a+b;}
void upd(int &a,int b){a=(a+b>=mod)?a+b-mod:a+b;}
int main(){
scanf("%d%d%d",&n,&m,&K);
int tot=(n+m-1)/(K-1);
f[0][0][0]=1;
n--;K--;swap(n,m);
int ans=0;
for(int i=1;i<=tot;i++){
for(int p=1;p<=n+1;p++) sum[p]=add(sum[p-1],add(f[i-1][p-1][0],f[i-1][p-1][1]));
for(int p=0;p<=n;p++){
f[i][p][0]=add(sum[p+1],mod-sum[p]);
int k=max(0,p-K);
f[i][p][1]=add(sum[p],mod-sum[k]);
}
for(int p=n%K;p<=n;p+=K){
if(i*K-p<=m&&(i*K-p)%K==m%K) upd(ans,f[i][p][1]);
}
}
printf("%d",ans);
return 0;
}
Submission Info
Submission Time
2018-03-16 15:13:16+0900
Task
E - Eternal Average
User
liumy2010
Language
C++14 (GCC 5.4.1)
Score
1600
Code Size
731 Byte
Status
AC
Exec Time
100 ms
Memory
62848 KB
Compile Error
./Main.cpp: In function ‘int main()’:
./Main.cpp:10:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d",&n,&m,&K);
^
Judge Result
Set Name
Sample
All
Score / Max Score
0 / 0
1600 / 1600
Status
Set Name
Test Cases
Sample
s1.txt, s2.txt, s3.txt
All
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, 24.txt, s1.txt, s2.txt, s3.txt
Case Name
Status
Exec Time
Memory
01.txt
AC
1 ms
256 KB
02.txt
AC
100 ms
62848 KB
03.txt
AC
1 ms
256 KB
04.txt
AC
1 ms
256 KB
05.txt
AC
40 ms
33024 KB
06.txt
AC
13 ms
12544 KB
07.txt
AC
3 ms
6912 KB
08.txt
AC
2 ms
896 KB
09.txt
AC
4 ms
4352 KB
10.txt
AC
3 ms
1664 KB
11.txt
AC
1 ms
256 KB
12.txt
AC
1 ms
256 KB
13.txt
AC
2 ms
896 KB
14.txt
AC
1 ms
384 KB
15.txt
AC
2 ms
768 KB
16.txt
AC
1 ms
256 KB
17.txt
AC
1 ms
384 KB
18.txt
AC
3 ms
1536 KB
19.txt
AC
10 ms
33664 KB
20.txt
AC
10 ms
10496 KB
21.txt
AC
1 ms
256 KB
22.txt
AC
9 ms
8448 KB
23.txt
AC
2 ms
1408 KB
24.txt
AC
2 ms
1152 KB
s1.txt
AC
1 ms
256 KB
s2.txt
AC
1 ms
256 KB
s3.txt
AC
1 ms
384 KB