QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#582931 | #9376. Game | Ail_ijyq | WA | 88ms | 3628kb | C++14 | 1.3kb | 2024-09-22 17:48:00 | 2024-09-22 17:48:00 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
using namespace std;
const int mod=998244353;
int qmi(int a,int b,int q)
{
int num=1;
while(b)
{
if(b&1)
num=a*num%q;
a=a*a%q;
b>>=1;
}
return num;
}
int fun(int a,int b,int k)//1-(a/b)^k=(b^k-a^k)/b^k
{
int t=qmi(b,k,mod);
int res=(t-qmi(a,k,mod)+mod)%mod;
return res* qmi(t,mod-2,mod)%mod;
}
int dfs(int x,int y,int ax,int ay)
{
int res=0;
if(x==0) return 0;
if(y==0) return 1;
if(x==y)
{
return ax*qmi(ax+ay,mod-2,mod)%mod;//x 赢一局的概率
}
if(x>y)//往右分支 b连赢
{
int p_next=qmi(ay*qmi(ax+ay,mod-2,mod),x/y,mod);//b连赢的概率
res=(res+p_next*dfs(x%y,y,ax,ay)%mod+fun(ay,ax+ay,x/y))%mod;
}
else if(x<y)//往左分支 a连赢
{
int p_next=qmi(ax*qmi(ax+ay,mod-2,mod),y/x,mod); //a连赢的概率
res=(res+p_next*dfs(x,y%x,ax,ay)%mod)%mod;//a连赢过后继续分支
}
return res;
}
void solve()
{
int x,y,a0,a1,b;
cin>>x>>y>>a0>>a1>>b;
cout<<dfs(x,y,a0,a1)<<endl;
}
signed main()
{
std::ios::sync_with_stdio(false);
cin.tie(0);
int t;
cin>>t;
while(t--)
{
solve();
}
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3628kb
input:
3 1 1 2 2 6 1 3 2 3 6 3 4 7 3 15
output:
499122177 910398850 220911476
result:
ok 3 lines
Test #2:
score: -100
Wrong Answer
time: 88ms
memory: 3508kb
input:
100000 1 1000000000 12980050 128257807 266126484 1 1000000000 400255084 123438563 768881284 1000000000 1000000000 24563487 72082135 450057094 1 1000000000 56952077 40876000 193815114 1000000000 1000000000 82048274 239365585 326520865 1000000000 1 309821265 346013425 963168258 1 1 104158269 199365020...
output:
7848007 419180552 612621163 36374442 592200562 45779380 870227707 169499045 86396463 415694940 46851356 252126 426243016 864656779 750317399 922456360 486881524 285134565 198191519 189360084 966510181 512645443 695650039 703100783 550002158 438470182 832829770 335852921 667870434 111027908 593590760...
result:
wrong answer 1st lines differ - expected: '947058399', found: '7848007'