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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 |
---|---|---|---|---|---|---|---|---|---|
#715116 | #9532. 长野原龙势流星群 | konata2828 | 0 | 146ms | 9348kb | C++20 | 989b | 2024-11-06 10:30:30 | 2024-11-06 10:30:31 |
Judging History
answer
// Hydro submission #672ad4c4a059678966633e4e@1730860229100
#include<bits/stdc++.h>
using namespace std;
const int N=2e5+5;
double dp[N];
int n,w[N],sum[N],head[N],ecnt=0;
struct edge {int to,nxt;}e[N<<1];
void add(int u,int v) {e[++ecnt]=(edge){v,head[u]};head[u]=ecnt;}
struct node {
double x;int y;
bool operator<(const node &o) const {
if(x==o.x) return y<o.y;
return x>o.x;
}
}tmp[N];
void dfs(int u) {
for(int i=head[u]; i; i=e[i].nxt) {
int v=e[i].to;
dfs(v);
}
int tot=0;
for(int i=head[u]; i; i=e[i].nxt) tmp[++tot]=(node){dp[e[i].to],sum[e[i].to]};
sort(tmp+1,tmp+tot+1);
dp[u]=w[u],sum[u]=1;
for(int i=1; i<=tot; i++) {
if(tmp[i].x<dp[u]) break;
dp[u]=(dp[u]*sum[u]+tmp[i].x*tmp[i].y)/(sum[u]+tmp[i].y);
sum[u]+=tmp[i].y;
}
}
int main() {
cin>>n;
for(int i=2; i<=n; i++) {
int p;cin>>p;
add(p,i);
}
for(int i=1; i<=n; i++) cin>>w[i];
dfs(1);
for(int i=1; i<=n; i++) printf("%.10lf\n",dp[i]);
return 0;
}
详细
Subtask #1:
score: 0
Wrong Answer
Test #1:
score: 0
Wrong Answer
time: 3ms
memory: 7924kb
input:
2000 1 2 2 4 5 2 3 6 4 2 7 2 8 14 8 12 1 14 4 14 8 18 9 2 7 22 20 22 14 29 28 16 6 21 23 6 21 14 13 9 1 4 18 13 2 39 21 33 18 20 38 27 27 1 49 5 51 3 31 24 10 42 2 44 13 9 35 66 27 60 67 59 29 40 53 2 33 43 26 43 62 16 78 45 14 10 73 69 41 35 25 26 2 70 54 1 54 48 5 36 44 28 90 29 51 51 93 82 95 45 ...
output:
878341451.1578947306 879173186.6363636255 848557303.2272727489 912609654.6666666269 872318573.5000000000 816339179.0000000000 850251397.5555555820 858217450.2352941036 812960827.3636363745 866017059.7777777910 693335785.3750000000 921947345.6666666269 994728511.5000000000 950304719.0000000000 808673...
result:
wrong answer 1st numbers differ - expected: '883838885.9230770', found: '878341451.1578947', error = '0.0062200'
Subtask #2:
score: 0
Wrong Answer
Test #32:
score: 0
Wrong Answer
time: 146ms
memory: 9348kb
input:
200000 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 36 37 37 38 38 39 39 40 40 41 41 42 42 43 43 44 44 45 45 46 46 47 47 48 48 49 49 50 50 51 51 52 52...
output:
686880396.2941176891 563544686.1428571939 693705743.1515151262 618391182.7999999523 746642876.0000000000 806376230.0000000000 698219365.7419354916 699584745.7500000000 617426841.1935484409 700325141.0000000000 691212027.0000000000 722381415.0000000000 631630674.3333333731 857291392.5000000000 709515...
result:
wrong answer 1st numbers differ - expected: '792545632.4154930', found: '686880396.2941177', error = '0.1333239'
Subtask #3:
score: 0
Skipped
Dependency #1:
0%
Subtask #4:
score: 0
Skipped
Dependency #2:
0%