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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#488754#8815. Space StationthomaswmyWA 52ms6984kbC++14954b2024-07-24 15:08:352024-07-24 15:08:43

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 15:08:43]
  • 评测
  • 测评结果:WA
  • 用时:52ms
  • 内存:6984kb
  • [2024-07-24 15:08:35]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
const int N=110;
const int M=1e4+10;
const int Mod=998244353;
typedef long long ll;

int qpow(int x,ll y) {
	int z=1;
	for(;y;y>>=1) {
		if(y&1) z=1ll*z*x%Mod;
		x=1ll*x*x%Mod;
	}
	return z;
}

int n,m;
int a[N];
int f[N][M];
int fac[N],inv[N];

int main() {
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++) scanf("%d",&a[i]);
	fac[0]=1;
	for(int i=1;i<=n;i++) fac[i]=1ll*fac[i-1]*i%Mod;
	inv[n]=qpow(fac[n],Mod-2);
	for(int i=n-1;i>=0;i--) inv[i]=1ll*inv[i+1]*(i+1)%Mod;
	f[0][0]=1;
	for(int i=1;i<=n;i++) {
		for(int j=i-1;j>=0;j--) {
			for(int k=0;k<=j*200;k++) {
				f[j+1][k+a[i]]=(f[j+1][k+a[i]]+f[j][k])%Mod;
			}
		}
	}
	int ans=0;
	for(int i=1;i<=n;i++) {
		for(int j=0;j<=i*200;j++) {
			int val=m;
			if(j<=i*m) val=1ll*j*qpow(i,Mod-2)%Mod;
			ans=(ans+1ll*val*f[i][j]%Mod*inv[n]%Mod*fac[i]%Mod*fac[n-i]%Mod)%Mod;
		}
	}
	printf("%d",ans);
	return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 3820kb

input:

3 3
2 3 4

output:

499122185

result:

ok 1 number(s): "499122185"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3820kb

input:

5 1
10 20 30 40 50

output:

5

result:

ok 1 number(s): "5"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3816kb

input:

1 9
37

output:

9

result:

ok 1 number(s): "9"

Test #4:

score: 0
Accepted
time: 0ms
memory: 3948kb

input:

5 5
24 41 29 6 40

output:

25

result:

ok 1 number(s): "25"

Test #5:

score: 0
Accepted
time: 1ms
memory: 3772kb

input:

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

output:

707882334

result:

ok 1 number(s): "707882334"

Test #6:

score: -100
Wrong Answer
time: 52ms
memory: 6984kb

input:

100 9
83 99 170 80 174 137 1 91 111 35 69 39 148 76 142 90 105 30 114 176 196 85 26 109 162 167 171 148 169 162 159 3 4 6 33 61 163 7 77 63 8 20 13 51 26 11 149 136 134 187 96 95 113 104 128 48 167 74 18 91 200 62 167 32 5 180 189 39 63 111 68 72 81 128 42 13 57 180 111 91 83 177 34 45 158 29 114 33...

output:

306152335

result:

wrong answer 1st numbers differ - expected: '82380556', found: '306152335'