Submission #519441

#	Time	Username	Problem	Language	Result	Execution time	Memory
519441		KiriLL1ca	Cat in a tree (BOI17_catinatree)	C++17	0 / 100	3 ms	4940 KiB

catinatree

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define fr first
#define sc second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pb push_back
#define endl '\n'
#define pw(x) (1ll << x)
#define sz(x) (int)((x).size())
#define sqr(x) ((ll)x)*((ll)x)
#define bcnt(X) __builtin_popcountll(X)
#define vec vector

#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target ("avx2,tune=native")

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

auto rng = bind(uniform_int_distribution<int>(1, 1e9), mt19937(133751));

const int N = 2e5 + 10;

int n, d;
vector <int> g[N];
int ans = 1;

void dfs (int v, int p, int keep) {
    if (!keep) ans++, keep = d;
    for (auto u : g[v]) {
        if (u != p) dfs(u, v, keep - 1);
    }
}

inline void solve () {
    cin >> n >> d;
    for (int i = 1; i < n; i++) {
        int p; cin >> p;
        g[i].pb(p); g[p].pb(i);
    }
    for (int i = 0; i < n; i++) {
        if (sz(g[i]) == 1) {
            dfs(i, -1, d);
            cout << ans;
            return;
        }
    }
}

signed main ()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int t = 1; //cin >> t;
    while (t--) solve();
    return 0;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 40
• Subtask 3: 0 / 49