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QOJ
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 |
---|---|---|---|---|---|---|---|---|---|
#825480 | #9778. Brotato | ucup-team1134# | WA | 536ms | 196604kb | C++23 | 3.0kb | 2024-12-21 19:41:04 | 2024-12-21 19:41:05 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return true; } return false; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return true; } return false; }
#define vi vector<int>
#define vl vector<ll>
#define vii vector<pair<int,int>>
#define vll vector<pair<ll,ll>>
#define vvi vector<vector<int>>
#define vvl vector<vector<ll>>
#define vvii vector<vector<pair<int,int>>>
#define vvll vector<vector<pair<ll,ll>>>
#define vst vector<string>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define mkunique(x) sort(all(x));(x).erase(unique(all(x)),(x).end())
#define fi first
#define se second
#define mp make_pair
#define si(x) int(x.size())
const int mod=998244353,MAX=300005,INF=15<<26;
#define ld long double
ld dp[MAX][123];
int main(){
std::ifstream in("text.txt");
std::cin.rdbuf(in.rdbuf());
cin.tie(0);
ios::sync_with_stdio(false);
ll N,K;
ld P;cin>>N>>K>>P;
ll pp=roundl(P*10000),qq=10000-pp,rr=10000;
chmin(K,120LL);
for(int j=0;j<=K;j++) dp[N][j]=0;
dp[0][0]=0;
for(int i=N-1;i>=0;i--){
dp[0][0]+=1.0l;
dp[0][0]/=qq;
dp[0][0]*=rr;
}
for(int i=N-1;i>=1;i--){
dp[i][0]=(dp[i+1][0]*qq+dp[0][0]*pp+rr)/rr;
}
//cout<<fixed<<setprecision(25)<<dp[0][0]<<endl;
for(int j=1;j<=K;j++){
for(int i=N-1;i>=0;i--){
dp[i][j]=(ld)(dp[i+1][j]*qq+dp[i][j-1]*pp+rr)/rr;
}
ld l=0,r=dp[0][j-1];
for(int q=0;q<80;q++){
ld m=(l+r)/2;
int L=0,R=N;
while(R-L>1){
int M=(L+R)/2;
if(dp[M][j-1]<m) R=M;
else L=M;
}
ld s=dp[R][j];
for(int i=L;i>=0;i--){
s=(ld)(s*qq+m*pp+rr)/rr;
}
if(s>m) l=m;
else r=m;
}
/*
int L=0,R=N;
while(R-L>1){
int M=(L+R)/2;
}
ld l=0,r=1e14;
for(int q=0;q<80;q++){
ld m=(l+r)/2;
int L=0,R=N;
while(R-L>1){
int M=(L+R)/2;
if(dp[M][j-1]<m) R=M;
else L=M;
}
for(int i=R;i>=1;i--){
dp[i][j]=(ld)(dp[i+1][j]*qq+min(dp[i][j-1],m)*pp+rr)/rr;
}
ld z=(dp[1][j]*qq+m*pp+rr)/rr;
//for(int i=0;i<=N;i++) cout<<m<<" "<<i<<" "<<dp[i][j]<<endl;
if(z>m) l=m;
else r=m;
}
*/
ld m=(l+r)/2;
for(int i=N-1;i>=1;i--){
dp[i][j]=(ld)(dp[i+1][j]*qq+min(dp[i][j-1],m)*pp+rr)/rr;
}
dp[0][j]=(l+r)/2;
//for(int i=0;i<=N;i++) cout<<dp[i][j]<<endl;
//cout<<fixed<<setprecision(25)<<(l+r)/2<<endl;
}
cout<<fixed<<setprecision(25)<<dp[0][K]<<endl;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 3932kb
input:
5 0 0.5
output:
61.9999999999999999965305530
result:
ok found '62.000000000', expected '62.000000000', error '0.000000000'
Test #2:
score: 0
Accepted
time: 0ms
memory: 3880kb
input:
5 1 0.5
output:
46.9999999999999999722444244
result:
ok found '47.000000000', expected '47.000000000', error '0.000000000'
Test #3:
score: 0
Accepted
time: 0ms
memory: 24000kb
input:
10000 0 0.002
output:
247489700298.2537139505147933959960938
result:
ok found '247489700298.253723145', expected '247489700298.253692627', error '0.000000000'
Test #4:
score: -100
Wrong Answer
time: 536ms
memory: 196604kb
input:
100000 10 0.0002
output:
38767507205.0245004594326019287109375
result:
wrong answer 1st numbers differ - expected: '38767507133.2322159', found: '38767507205.0244980', error = '0.0000000'