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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#488614#8815. Space StationzyxawaWA 1ms3888kbC++14672b2024-07-24 11:59:282024-07-24 11:59:28

Judging History

你现在查看的是最新测评结果

  • [2024-07-30 16:51:06]
  • hack成功,自动添加数据
  • (/hack/760)
  • [2024-07-24 11:59:28]
  • 评测
  • 测评结果:WA
  • 用时:1ms
  • 内存:3888kb
  • [2024-07-24 11:59:28]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int n,m,s,w,a[101];
ll ans,dp[101][20001],c[101][101];
const int mod=998244353;
ll inv(ll a){
	ll s=1;
	for(ll b=mod-2;b;b>>=1,a=a*a%mod) if(b&1) s=s*a%mod;
	return s;
}
int main(){
	scanf("%d%d",&n,&m);
	for(int i=0;i<=n;i++) dp[0][0]=c[i][0]=1;
	for(int i=1;i<=n;i++){
		scanf("%d",&w),s+=w;
		for(int j=i;j>=1;j--) for(int k=s;k>=w;k--) (dp[j][k]+=dp[j-1][k-w])%=mod;
		for(int j=1;j<=i;j++) c[i][j]=(c[i-1][j-1]+c[i-1][j])%mod;
	}
	for(int i=0;i<n;i++) for(int j=0;j<s;j++) (ans+=dp[i][j]*inv(c[n][i])%mod*(m>(s-j)/(n-i)?(s-j)*inv(n-i):m))%=mod;
	printf("%lld",ans);
	return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 0ms
memory: 3888kb

input:

3 3
2 3 4

output:

499122185

result:

ok 1 number(s): "499122185"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3760kb

input:

5 1
10 20 30 40 50

output:

5

result:

ok 1 number(s): "5"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3872kb

input:

1 9
37

output:

9

result:

ok 1 number(s): "9"

Test #4:

score: 0
Accepted
time: 0ms
memory: 3716kb

input:

5 5
24 41 29 6 40

output:

25

result:

ok 1 number(s): "25"

Test #5:

score: -100
Wrong Answer
time: 1ms
memory: 3828kb

input:

10 34
91 86 1 14 98 13 85 64 91 20

output:

763359361

result:

wrong answer 1st numbers differ - expected: '707882334', found: '763359361'