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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 |
---|---|---|---|---|---|---|---|---|---|
#209110 | #6638. Treelection | c20230507 | WA | 85ms | 5984kb | C++14 | 1.0kb | 2023-10-10 10:16:05 | 2023-10-10 10:16:06 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int maxn=2e5+10;
const int INF=0x3f3f3f3f;
int t,n,fa[maxn],siz[maxn],dp[maxn],vis[maxn];
int check(int x){
for(int i=1;i<=n;i++)dp[i]=0;
for(int i=n;i>1;i--){
dp[i]=max(dp[i]-x,0);
dp[fa[i]]=dp[fa[i]]+dp[i]+1;
}
return dp[1]<=x;
}
int main(){
std::ios::sync_with_stdio(false);
cin.tie(0),cout.tie(0);
cin>>t;
while(t--){
cin>>n;
for(int i=2;i<=n;i++)cin>>fa[i];
for(int i=1;i<=n;i++)siz[i]=1;
for(int i=n;i>1;i--)siz[fa[i]]+=siz[i];
int l=1,r=n,ans;
while(l<=r){
int mid=(l+r)/2;
if(check(mid))r=mid-1,ans=mid;
else l=mid+1;
}
check(ans-1);
if(dp[1]==ans){
vis[1]=1;
for(int i=2;i<=n;i++)if(vis[fa[i]]&&dp[i])vis[i]=1;
}
for(int i=1;i<=n;i++){
if(siz[i]-1>ans||(siz[i]-1==ans&&vis[i]))cout<<1;
else cout<<0;
}
cout<<"\n";
}
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 0ms
memory: 3676kb
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: 85ms
memory: 5984kb
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 5th lines differ - expected: '111111111111111111111111111111...0000000000000000000000000000000', found: '111111111111111111111111111111...0000000000000000000000000000000'