#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
using namespace std;
const int mxn=2e5+5;
const int inf=1e9;
int d;
int level[mxn];
set<pii> st;
vector<int> adj[mxn];
int par[mxn];
int near[mxn];
void dfs(int cur,int prev,int dist,int x) {
if(dist >= d) return;
if(st.find({level[cur],cur}) != st.end()) st.erase({level[cur],cur});
for(int u : adj[cur]) {
if(u == prev || (cur == x && level[u] > level[cur]) ) continue;
dfs(u,cur,dist + 1,x);
}
}
bool check(int cur,int dist) {
if(dist >= d) return true;
if(dist + near[cur] < d) return false;
if(par[cur] == cur) return true;
return check(par[cur],dist + 1);
}
void update(int cur,int dist) {
if(dist >= d) return;
near[cur] = min(near[cur],dist);
update(par[cur],dist + 1);
}
void DFS(int cur,int prev) {
level[cur] = level[prev] + 1;
par[cur] = prev;
for(int u : adj[cur]) {
if(u != prev) DFS(u,cur);
}
}
int main() {
int n;
cin>>n;
cin>>d;
for(int i = 1; i < n; i++) {
int u;
cin>>u;
adj[u].push_back(i);
adj[i].push_back(u);
}
for(int i = 0; i <= n; i++) near[i] = inf;
level[0] = 0;
DFS(0,0);
vector<pii> v;
for(int i = 0; i < n; i++) v.push_back({level[i],i});
sort(v.begin(),v.end());
int res = 0;
for(int i = v.size() - 1; i >= 0; i--) {
int u = v[i].second;
bool f = check(u,0);
if(f) {
res++;
update(u,0);
}
}
cout<<res<<endl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
4992 KB |
Output is correct |
| 2 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 4 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 18 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
3 ms |
4972 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
4992 KB |
Output is correct |
| 2 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 4 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 18 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 21 |
Correct |
4 ms |
5228 KB |
Output is correct |
| 22 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 23 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 24 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 25 |
Correct |
4 ms |
5120 KB |
Output is correct |
| 26 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 27 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 28 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 29 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 30 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 31 |
Correct |
5 ms |
5120 KB |
Output is correct |
| 32 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 33 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 34 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 35 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 36 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 37 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 38 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 39 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 40 |
Correct |
4 ms |
5228 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
4992 KB |
Output is correct |
| 2 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 4 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 6 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 7 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 8 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 10 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 11 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 12 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 13 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 15 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 16 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 17 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 18 |
Correct |
4 ms |
4972 KB |
Output is correct |
| 19 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 20 |
Correct |
3 ms |
4972 KB |
Output is correct |
| 21 |
Correct |
4 ms |
5228 KB |
Output is correct |
| 22 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 23 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 24 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 25 |
Correct |
4 ms |
5120 KB |
Output is correct |
| 26 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 27 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 28 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 29 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 30 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 31 |
Correct |
5 ms |
5120 KB |
Output is correct |
| 32 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 33 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 34 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 35 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 36 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 37 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 38 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 39 |
Correct |
4 ms |
5100 KB |
Output is correct |
| 40 |
Correct |
4 ms |
5228 KB |
Output is correct |
| 41 |
Correct |
119 ms |
16608 KB |
Output is correct |
| 42 |
Correct |
78 ms |
11196 KB |
Output is correct |
| 43 |
Correct |
76 ms |
11132 KB |
Output is correct |
| 44 |
Correct |
74 ms |
11112 KB |
Output is correct |
| 45 |
Correct |
74 ms |
11112 KB |
Output is correct |
| 46 |
Correct |
169 ms |
17264 KB |
Output is correct |
| 47 |
Correct |
178 ms |
17120 KB |
Output is correct |
| 48 |
Correct |
174 ms |
17120 KB |
Output is correct |
| 49 |
Correct |
176 ms |
17120 KB |
Output is correct |
| 50 |
Correct |
53 ms |
11368 KB |
Output is correct |
| 51 |
Correct |
60 ms |
11500 KB |
Output is correct |
| 52 |
Correct |
56 ms |
11368 KB |
Output is correct |
| 53 |
Correct |
109 ms |
17632 KB |
Output is correct |
| 54 |
Correct |
113 ms |
17760 KB |
Output is correct |
| 55 |
Correct |
115 ms |
17632 KB |
Output is correct |
| 56 |
Correct |
5 ms |
5228 KB |
Output is correct |
| 57 |
Correct |
15 ms |
7404 KB |
Output is correct |
| 58 |
Correct |
58 ms |
15340 KB |
Output is correct |
| 59 |
Correct |
143 ms |
21728 KB |
Output is correct |
| 60 |
Correct |
119 ms |
16868 KB |
Output is correct |
| 61 |
Correct |
132 ms |
16608 KB |
Output is correct |
