#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
const int maxn = 2e5+10;
int n,D, dpq[maxn], dp1[maxn], dp2[maxn];
vector<int> g[maxn];
// quantity of marked nodes
// distance from the closest marked node
// distance from the closest marked node more than (D+1)/2
void dfs(int u) {
dpq[u] = 0;
dp1[u] = 0;
dp2[u] = D+1;
if(g[u].size() == 0) return;
for(auto v : g[u]) {
dfs(v);
dpq[u]+= dpq[v];
dp2[u] = min(dp2[u],dp2[v]+1);
if(dp1[v]+1 >= (D+1)/2) {
dpq[u]++;
dp2[u] = min(dp2[u],dp1[v]+1);
}
else {
dp1[u] = max(dp1[u],dp1[v]+1);
}
}
if(dp1[u]+dp2[u] < D) {
dp1[u] = 0;
}
if(u == 1 && dp1[u]+dp2[u] >= D) {
dpq[u]++;
}
}
void solve() {
cin >> n >> D;
for(int i = 2; i <= n; i++) {
int x; cin >> x;
g[x+1].pb(i);
}
dfs(1);
cout << dpq[1] << endl;
}
int32_t main() {
ios::sync_with_stdio(false); cin.tie(0);
// freopen("in.in", "r", stdin);
// freopen("out.out", "w", stdout);
int tt = 1;
// cin >> tt;
while(tt--) {
solve();
}
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
2 ms |
4948 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
2 ms |
4948 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
2 ms |
4948 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |