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 |
|
|
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 |