Submission #1001152
Source Code Expand
#include <bits/stdc++.h> using namespace std; long long mod=1000000007ll; long long v[10010],P[10010],rP[10010]; void pre(int N) { v[1]=1; for(int i=2;i<N;i++){ v[i]=(mod-mod/i)*v[mod%i]%mod; } P[0]=rP[0]=1ll; for(int i=1;i<N;i++){ P[i]=P[i-1]*i%mod; rP[i]=rP[i-1]*v[i]%mod; } } long long C(int a,int b) { return P[a]*rP[b]%mod*rP[a-b]%mod; } int main() { pre(10010); int n,a,b,c; scanf("%d%d%d%d",&n,&a,&b,&c); if(b%2!=0){ printf("0\n"); return 0; } b/=2; long long ans=0ll; for(int x=0;x<=a;x++){ for(int y=0;(a-x)+3*y<=c;y++){ int m=a+y,r=c-(a-x)-3*y; long long P=C(m,a)%mod*C(a,x)%mod,Q; if(b==0){ Q=(r==0?1:0); } else{ Q=C(b+m,m)*C(r+b-1,b-1)%mod; } ans+=P*Q%mod; ans%=mod; } } printf("%lld\n",ans); return 0; }
Submission Info
Submission Time | |
---|---|
Task | J - 123 Pairs |
User | Huziwara |
Language | C++14 (GCC 5.4.1) |
Score | 1500 |
Code Size | 887 Byte |
Status | AC |
Exec Time | 136 ms |
Memory | 512 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:29:32: 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); ^
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1500 / 1500 | ||||
Status |
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Set Name | Test Cases |
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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 | AC | 66 ms | 512 KB |
001.txt | AC | 4 ms | 512 KB |
002.txt | AC | 3 ms | 512 KB |
003.txt | AC | 3 ms | 512 KB |
004.txt | AC | 4 ms | 512 KB |
005.txt | AC | 3 ms | 512 KB |
006.txt | AC | 3 ms | 512 KB |
007.txt | AC | 4 ms | 512 KB |
008.txt | AC | 3 ms | 512 KB |
009.txt | AC | 3 ms | 512 KB |
010.txt | AC | 3 ms | 512 KB |
011.txt | AC | 3 ms | 512 KB |
012.txt | AC | 3 ms | 512 KB |
013.txt | AC | 3 ms | 512 KB |
014.txt | AC | 4 ms | 512 KB |
015.txt | AC | 107 ms | 512 KB |
016.txt | AC | 10 ms | 512 KB |
017.txt | AC | 32 ms | 512 KB |
018.txt | AC | 9 ms | 512 KB |
019.txt | AC | 37 ms | 512 KB |
020.txt | AC | 14 ms | 512 KB |
021.txt | AC | 93 ms | 512 KB |
022.txt | AC | 12 ms | 512 KB |
023.txt | AC | 22 ms | 512 KB |
024.txt | AC | 95 ms | 512 KB |
025.txt | AC | 18 ms | 512 KB |
026.txt | AC | 56 ms | 512 KB |
027.txt | AC | 88 ms | 512 KB |
028.txt | AC | 34 ms | 512 KB |
029.txt | AC | 44 ms | 512 KB |
030.txt | AC | 87 ms | 512 KB |
031.txt | AC | 95 ms | 512 KB |
032.txt | AC | 10 ms | 512 KB |
033.txt | AC | 3 ms | 512 KB |
034.txt | AC | 37 ms | 512 KB |
035.txt | AC | 49 ms | 512 KB |
036.txt | AC | 11 ms | 512 KB |
037.txt | AC | 3 ms | 512 KB |
038.txt | AC | 136 ms | 512 KB |
039.txt | AC | 3 ms | 512 KB |
040.txt | AC | 3 ms | 512 KB |
041.txt | AC | 25 ms | 512 KB |
042.txt | AC | 4 ms | 512 KB |
043.txt | AC | 3 ms | 512 KB |
044.txt | AC | 3 ms | 512 KB |
045.txt | AC | 3 ms | 512 KB |
046.txt | AC | 3 ms | 512 KB |
047.txt | AC | 3 ms | 512 KB |
048.txt | AC | 3 ms | 512 KB |
049.txt | AC | 3 ms | 512 KB |
example0.txt | AC | 3 ms | 512 KB |
example1.txt | AC | 4 ms | 512 KB |