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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#76117#5464. Dice GamezhouhuanyiWA 2ms3548kbC++141.7kb2023-02-07 19:15:092023-02-07 19:15:10

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-02-07 19:15:10]
  • 评测
  • 测评结果:WA
  • 用时:2ms
  • 内存:3548kb
  • [2023-02-07 19:15:09]
  • 提交

answer

#include<iostream>
#include<cstdio>
#include<algorithm>
#define N 29
#define M 100000
#define mod 998244353
using namespace std;
int read()
{
    char c=0;
    int sum=0;
    while (c<'0'||c>'9') c=getchar();
    while ('0'<=c&&c<='9') sum=sum*10+c-'0',c=getchar();
    return sum;
}
void Adder(int &x,int d)
{
    x+=d;
    if (x>=mod) x-=mod;
    return;
}
void Adder2(int &x,int d)
{
    x+=d;
    if (x<0) x+=mod;
    return;
}
int MD(int x)
{
    return (x>=mod)?x-mod:x;
}
int MD2(int x)
{
    return (x<0)?x+mod:x;
}
int fast_pow(int a,int b)
{
    int res=1,mul=a;
    while (b)
    {
	if (b&1) res=1ll*res*mul%mod;
	mul=1ll*mul*mul%mod,b>>=1;
    }
    return res;
}
int T,n,cnt,inv2,F[N+1],ans;
bool used[N+1];
long long delta[N+1];
bool cmp(long long x,long long y)
{
    return x>y;
}
void dfs(int x,bool op,long long res)
{
    int dst=0;
    long long rst=0;
    for (int i=0;i<=x;++i) rst+=delta[i];
    if (res+rst<=0) return;
    if (res-rst>0)
    {
	for (int i=x+1;i<=cnt;++i)
	{
	    if (!used[i]) Adder(dst,delta[i]%mod);
	    else Adder2(dst,-delta[i]%mod);
	}
	for (int i=0;i<=x;++i) dst=2ll*dst%mod;
	Adder(ans,dst);
	return;
    }
    used[x]=0,dfs(x-1,op|(((n-1)>>x)&1),res+delta[x]);
    if (op||(((n-1)>>x)&1)) used[x]=1,dfs(x-1,op,res-delta[x]);
    return;
}
int main()
{
    T=read(),inv2=(mod+1)>>1;
    while (T--)
    {
	n=read(),cnt=ans=0;
	while ((1<<cnt)<n) cnt++;
	for (int i=0;i<=cnt;++i) F[i]=n/(1<<(i+1))*(1<<i)+max(n%(1<<(i+1))-(1<<i),0),delta[i]=1ll*F[i]*(1<<i);
	dfs(cnt,0,0),ans=1ll*ans*fast_pow(n,mod-2)%mod,Adder(ans,1ll*n*(n-1)%mod*inv2%mod),printf("%lld\n",1ll*ans*fast_pow(n,mod-2)%mod);
    }
    return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 3520kb

input:

4
1
2
3
4

output:

0
249561089
776412276
2

result:

ok 4 number(s): "0 249561089 776412276 2"

Test #2:

score: -100
Wrong Answer
time: 2ms
memory: 3548kb

input:

100
119
75
29
10
17
29
449
71
72
12
79
117
83
80
35
272
105
497
346
287
362
140
297
167
111
419
210
212
170
413
373
210
196
39
1
101
258
496
333
293
392
2
187
431
157
342
436
106
449
136
378
243
357
325
237
254
22
292
62
435
18
446
471
18
42
377
181
350
19
389
212
58
45
70
52
63
107
71
66
355
381
30...

output:

645006489
994517624
400009943
299473312
942978241
400009943
60548260
632690131
979758395
471393174
175624519
531171954
143020402
134763040
663323210
613108745
269095960
284396636
191400715
657877509
967774080
157681959
601296181
5941827
724073586
701650152
262576881
417830609
833275086
916357319
143...

result:

wrong answer 2nd numbers differ - expected: '296012775', found: '994517624'