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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#209981 | #6638. Treelection | kkio | WA | 171ms | 39916kb | C++17 | 1.5kb | 2023-10-10 21:01:47 | 2023-10-10 21:01:48 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
const int maxn=1e6+10;
int n,p[maxn],f[maxn];
vector<int> G[maxn];
int L;
void dfs(int u,int fa)
{
int sum=0;
for(int v:G[u])
if(v!=fa)
dfs(v,u),sum+=f[v];
f[u]=(u!=1)+max(0,sum-L);
}
int tag[maxn],siz[maxn],S[maxn];
void sdfs(int u,int fa)
{
siz[u]=0;
if(u!=1)tag[u]=min(tag[u],f[u]);
for(int v:G[u])
if(v!=fa)
{
sdfs(v,u);
tag[v]=tag[u];
siz[u]+=siz[v];
}
S[u]=siz[u];
siz[u]++;
}
char ans[maxn];
void solve()
{
scanf("%d",&n);
for(int i=1;i<=n;i++)G[i].clear();
for(int i=2;i<=n;i++)
scanf("%d",&p[i]),G[p[i]].push_back(i),G[i].push_back(p[i]);
int l=1,r=n,mid,z=n-1;
while(l<=r)
{
mid=l+r>>1;
//printf("%d\n",mid);
L=mid;
dfs(1,0);
if(f[1]==0)z=mid,r=mid-1;
else l=mid+1;
}
L=z-1;
//printf("%d\n",z);
dfs(1,0);
//for(int i=1;i<=n;i++)printf("%d ",f[i]);putchar('\n');
for(int i=1;i<=n;i++)tag[i]=1e9;
sdfs(1,0);
//for(int i=1;i<=n;i++)printf("%d ",S[i]);putchar('\n');
for(int i=1;i<=n;i++)
if(S[i]>z)ans[i]='1';
else if(S[i]<z)ans[i]='0';
else if(tag[i]>0&&f[i]==1)ans[i]='1';
else ans[i]='0';
for(int i=1;i<=n;i++)putchar(ans[i]);putchar('\n');
}
int main()
{
int T;scanf("%d",&T);
while(T--)solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 38496kb
input:
2 4 1 2 3 5 1 1 2 2
output:
1100 10000
result:
ok 2 lines
Test #2:
score: -100
Wrong Answer
time: 171ms
memory: 39916kb
input:
10 100000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 10...
output:
111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
wrong answer 1st lines differ - expected: '111111111111111111111111111111...0000000000000000000000000000000', found: '111111111111111111111111111111...0000000000000000000000000000000'