Submission #1014495


Source Code Expand

#include <cstdio>
#include <cstring>
#include <vector>
#include<queue>
#include <algorithm>
#define pb push_back
using namespace std;
const int P = 1000000007;
const int N = 101010;
int n,a,b,c,i;
long long jc[N],ans;
long long ksm(long long a,long long b){
	if (b==0){
		return 1;
	}
	long long ans=ksm(a,b/2);
	ans=ans*ans%P;
	if (b%2==1) ans=ans*a%P;
	return ans;
}
long long cc(int a,int b){
	return jc[b]*ksm(jc[a]*jc[b-a]%P,P-2)%P;
}
int main(){
	jc[0]=1;
	for (i=1;i<=20000;i++)
		jc[i]=(jc[i-1]*i)%P;
	scanf("%d%d%d%d",&n,&a,&b,&c);
	if (b%2==1){
		printf("0\n");
		return 0;
	}
	//printf("%lld\n",cc(2,5));
	int ds=a+b/2;
	for (i=0;i<=a;i++){
		int t=a-i;
		if (t>c) continue;
		int tt=c-t;
		for (int j=0;j*3<=tt;j++){
			long long tmp=cc(j,ds+j)*cc(i,ds)%P*cc(a-i,ds-i)%P;
			int ttt=tt-3*j;
			if ((b==0)&&(ttt)) continue;
			tmp=tmp*cc(b/2-1,b/2+ttt-1)%P;
			ans=(ans+tmp)%P;
		}
	}
	printf("%lld\n",ans);
}

Submission Info

Submission Time
Task J - 123 Pairs
User gxgod
Language C++14 (GCC 5.4.1)
Score 0
Code Size 969 Byte
Status WA
Exec Time 970 ms
Memory 384 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:28:31: 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 0 / 1500
Status
AC × 2
AC × 47
WA × 5
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 AC 463 ms 256 KB
001.txt AC 5 ms 384 KB
002.txt AC 2 ms 256 KB
003.txt AC 2 ms 256 KB
004.txt AC 7 ms 384 KB
005.txt AC 2 ms 256 KB
006.txt AC 2 ms 384 KB
007.txt WA 7 ms 256 KB
008.txt AC 2 ms 256 KB
009.txt AC 2 ms 384 KB
010.txt WA 2 ms 256 KB
011.txt AC 2 ms 256 KB
012.txt WA 3 ms 256 KB
013.txt AC 2 ms 384 KB
014.txt AC 6 ms 384 KB
015.txt AC 758 ms 256 KB
016.txt AC 51 ms 256 KB
017.txt AC 209 ms 384 KB
018.txt AC 47 ms 256 KB
019.txt AC 247 ms 256 KB
020.txt AC 78 ms 256 KB
021.txt AC 653 ms 256 KB
022.txt AC 65 ms 384 KB
023.txt AC 138 ms 256 KB
024.txt AC 669 ms 256 KB
025.txt AC 106 ms 256 KB
026.txt AC 390 ms 384 KB
027.txt AC 620 ms 256 KB
028.txt AC 226 ms 384 KB
029.txt AC 297 ms 384 KB
030.txt AC 616 ms 256 KB
031.txt AC 674 ms 384 KB
032.txt AC 54 ms 256 KB
033.txt AC 2 ms 256 KB
034.txt AC 251 ms 384 KB
035.txt AC 332 ms 384 KB
036.txt AC 61 ms 256 KB
037.txt AC 2 ms 256 KB
038.txt AC 970 ms 384 KB
039.txt AC 2 ms 256 KB
040.txt AC 2 ms 256 KB
041.txt AC 163 ms 256 KB
042.txt AC 7 ms 384 KB
043.txt AC 2 ms 384 KB
044.txt AC 2 ms 256 KB
045.txt AC 2 ms 384 KB
046.txt WA 2 ms 256 KB
047.txt WA 2 ms 256 KB
048.txt AC 2 ms 256 KB
049.txt AC 2 ms 256 KB
example0.txt AC 2 ms 384 KB
example1.txt AC 10 ms 256 KB