Submission #1193053
Source Code Expand
#include <cstdio>
#define N 10003
#define IL inline
#define REP(a,b,c) for(a=b;a<=c;a++)
#define PER(a,b,c) for(a=b;a>=c;a--)
using namespace std;
typedef long long lol;
const lol mod=1e9+7;
int n,a,b,c;lol fac[N],inv[N];
IL lol C(int n,int m){return fac[n]*inv[m]%mod*inv[n-m]%mod;}
IL lol qpow(lol a,int b){lol res=1;while(b){if(b&1)res=res*a%mod;a=a*a%mod,b>>=1;}return res;}
IL lol f(int n,int m){
if(!n)return m==0;
return C(n+m-1,m)*inv[n]%mod;
}
int main(){
scanf("%d%d%d%d",&n,&a,&b,&c);fac[0]=1;int x1,x2,x3,x4,S,up=n<<1,ans=0;
REP(x1,1,up)fac[x1]=fac[x1-1]*x1%mod;inv[up]=qpow(fac[up],mod-2);
PER(x1,up,1)inv[x1-1]=inv[x1]*x1%mod;
for(x2=0;x2<=a&&x2<=c;x2++)
for(x1=a-x2,S=c-x2,x3=0;S>=0;x3++,S-=3)
ans=(ans+fac[x1+x2+x3+x4]*inv[x1]%mod*inv[x2]%mod*inv[x3]%mod*f(x4,S))%mod;
printf("%d\n",ans);
return 0;
}
Submission Info
Submission Time
2017-03-31 21:22:52+0900
Task
J - 123 Pairs
User
mytryer
Language
C++14 (GCC 5.4.1)
Score
0
Code Size
854 Byte
Status
WA
Exec Time
10 ms
Memory
256 KB
Compile Error
./Main.cpp: In function ‘int main()’:
./Main.cpp:17:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d%d",&n,&a,&b,&c);fac[0]=1;int x1,x2,x3,x4,S,up=n<<1,ans=0;
^
Judge Result
Set Name
Sample
All
Score / Max Score
0 / 0
0 / 1500
Status
Set Name
Test Cases
Sample
example0.txt, example1.txt
All
000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt, 022.txt, 023.txt, 024.txt, 025.txt, 026.txt, 027.txt, 028.txt, 029.txt, 030.txt, 031.txt, 032.txt, 033.txt, 034.txt, 035.txt, 036.txt, 037.txt, 038.txt, 039.txt, 040.txt, 041.txt, 042.txt, 043.txt, 044.txt, 045.txt, 046.txt, 047.txt, 048.txt, 049.txt, example0.txt, example1.txt
Case Name
Status
Exec Time
Memory
000.txt
WA
5 ms
256 KB
001.txt
WA
1 ms
256 KB
002.txt
WA
1 ms
256 KB
003.txt
WA
1 ms
256 KB
004.txt
WA
1 ms
256 KB
005.txt
WA
1 ms
256 KB
006.txt
WA
1 ms
256 KB
007.txt
AC
1 ms
256 KB
008.txt
WA
1 ms
256 KB
009.txt
WA
1 ms
256 KB
010.txt
AC
1 ms
256 KB
011.txt
AC
1 ms
256 KB
012.txt
AC
1 ms
256 KB
013.txt
WA
1 ms
128 KB
014.txt
WA
1 ms
128 KB
015.txt
WA
8 ms
256 KB
016.txt
WA
1 ms
256 KB
017.txt
WA
3 ms
256 KB
018.txt
WA
1 ms
256 KB
019.txt
WA
3 ms
256 KB
020.txt
WA
1 ms
256 KB
021.txt
WA
7 ms
256 KB
022.txt
WA
1 ms
256 KB
023.txt
WA
2 ms
256 KB
024.txt
WA
7 ms
256 KB
025.txt
WA
2 ms
256 KB
026.txt
WA
4 ms
256 KB
027.txt
WA
6 ms
256 KB
028.txt
WA
3 ms
256 KB
029.txt
WA
3 ms
256 KB
030.txt
WA
6 ms
256 KB
031.txt
WA
7 ms
256 KB
032.txt
WA
1 ms
256 KB
033.txt
WA
2 ms
256 KB
034.txt
WA
3 ms
256 KB
035.txt
WA
4 ms
256 KB
036.txt
WA
1 ms
256 KB
037.txt
WA
1 ms
128 KB
038.txt
WA
10 ms
256 KB
039.txt
WA
2 ms
256 KB
040.txt
WA
2 ms
256 KB
041.txt
WA
2 ms
256 KB
042.txt
WA
1 ms
256 KB
043.txt
AC
1 ms
128 KB
044.txt
AC
1 ms
128 KB
045.txt
WA
1 ms
128 KB
046.txt
AC
1 ms
128 KB
047.txt
AC
1 ms
128 KB
048.txt
WA
1 ms
128 KB
049.txt
WA
1 ms
128 KB
example0.txt
WA
1 ms
128 KB
example1.txt
WA
1 ms
128 KB