Submission #1179506


Source Code Expand

#include<bits/stdc++.h>
#define N 10005
#define LL long long
using namespace std;
const int mo=1e9+7;
int n,a,b,c; LL fc[N],xf[N],ans;
LL fpm(LL x,LL y){ LL s=1; while(y){ if(y&1) s=(s*x)%mo; y>>=1,x=(x*x)%mo;} return s;}
LL C(int n,int m){ return fc[n]*xf[m]%mo*xf[n-m]%mo;}
LL f(int n,int m)
{
	if(!n) return (m==0);
	else return xf[m]*C(m+n-1,n-1)%mo;
}
int main()
{
	int i,j,p,q,r,s,v;
	cin>>n>>a>>b>>c;
	if(b&1){ printf("0"); return 0;}
	fc[0]=xf[0]=1;
	for(i=1;i<N;i++){
		fc[i]=(fc[i-1]*i)%mo;
		xf[i]=fpm(fc[i],mo-2);
	  }
	for(i=0;i<=a&&i<=c;i++)
		for(j=0;i+3*j<=c;j++){
			p=a-i,q=i,r=j,s=b/2,v=c-i-3*j;
			ans=(ans+fc[p+q+r+s]*xf[p]%mo*xf[q]%mo*xf[r]%mo*f(s,v))%mo;
		  }
	cout<<ans;
	return 0;
}

Submission Info

Submission Time
Task J - 123 Pairs
User MemorySlices
Language C++14 (GCC 5.4.1)
Score 0
Code Size 740 Byte
Status WA
Exec Time 19 ms
Memory 384 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 1500
Status
AC × 1
WA × 1
AC × 14
WA × 38
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 11 ms 384 KB
001.txt WA 3 ms 384 KB
002.txt WA 3 ms 384 KB
003.txt WA 3 ms 384 KB
004.txt WA 3 ms 384 KB
005.txt WA 3 ms 384 KB
006.txt WA 3 ms 384 KB
007.txt AC 3 ms 384 KB
008.txt WA 3 ms 384 KB
009.txt WA 3 ms 384 KB
010.txt AC 3 ms 384 KB
011.txt WA 3 ms 384 KB
012.txt AC 3 ms 384 KB
013.txt WA 3 ms 384 KB
014.txt WA 3 ms 384 KB
015.txt WA 16 ms 384 KB
016.txt WA 4 ms 384 KB
017.txt WA 6 ms 384 KB
018.txt WA 4 ms 384 KB
019.txt WA 7 ms 384 KB
020.txt WA 4 ms 384 KB
021.txt WA 14 ms 384 KB
022.txt WA 4 ms 384 KB
023.txt WA 5 ms 384 KB
024.txt WA 14 ms 384 KB
025.txt WA 5 ms 384 KB
026.txt WA 9 ms 384 KB
027.txt WA 13 ms 384 KB
028.txt WA 7 ms 384 KB
029.txt WA 8 ms 384 KB
030.txt WA 13 ms 384 KB
031.txt WA 14 ms 384 KB
032.txt WA 4 ms 384 KB
033.txt AC 1 ms 256 KB
034.txt WA 7 ms 384 KB
035.txt WA 8 ms 384 KB
036.txt WA 4 ms 384 KB
037.txt WA 3 ms 384 KB
038.txt WA 19 ms 384 KB
039.txt AC 1 ms 256 KB
040.txt AC 1 ms 256 KB
041.txt WA 5 ms 384 KB
042.txt WA 3 ms 384 KB
043.txt AC 3 ms 384 KB
044.txt AC 3 ms 384 KB
045.txt AC 3 ms 384 KB
046.txt AC 3 ms 384 KB
047.txt AC 3 ms 384 KB
048.txt AC 3 ms 384 KB
049.txt AC 3 ms 384 KB
example0.txt AC 3 ms 384 KB
example1.txt WA 3 ms 384 KB