Submission #881310

#	Time	Username	Problem	Language	Result	Execution time	Memory
881310		noompty	Ball Machine (BOI13_ballmachine)	C++17	100 / 100	95 ms	29632 KiB

ballmachine

#include <iostream>
#include <vector>
#include <tuple>
#include <queue>
#include <stack>
#include <deque>
#include <set>
#include <map>
#include <cmath>
#include <array>
#include <random>
#include <string>
#include <cassert>
#include <climits>
#include <algorithm>
#include <unordered_set>
#include <unordered_map>
using namespace std;
 
#define ll long long
#define f first
#define s second
 
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
 
template<typename A> void __print(const A &x);
template<typename A, typename B> void __print(const pair<A, B> &p);
template<typename... A> void __print(const tuple<A...> &t);
template<typename T> void __print(stack<T> s);
template<typename T> void __print(queue<T> q);
template<typename T, typename... U> void __print(priority_queue<T, U...> q);
 
template<typename A> void __print(const A &x) {
    bool first = true;
    cerr << '{';
    for (const auto &i : x) {
        cerr << (first ? "" : ","), __print(i);
        first = false;
    }
    cerr << '}';
}
 
template<typename A, typename B> void __print(const pair<A, B> &p) {
    cerr << '(';
    __print(p.f);
    cerr << ',';
    __print(p.s);
    cerr << ')';
}
 
template<typename... A> void __print(const tuple<A...> &t) {
    bool first = true;
    cerr << '(';
    apply([&first] (const auto &...args) { ((cerr << (first ? "" : ","), __print(args), first = false), ...); }, t);
    cerr << ')';
}
 
template<typename T> void __print(stack<T> s) {
    vector<T> debugVector;
    while (!s.empty()) {
        T t = s.top();
        debugVector.push_back(t);
        s.pop();
    }
    reverse(debugVector.begin(), debugVector.end());
    __print(debugVector);
}
 
template<typename T> void __print(queue<T> q) {
    vector<T> debugVector;
    while (!q.empty()) {
        T t = q.front();
        debugVector.push_back(t);
        q.pop();
    }
    __print(debugVector);
}
 
template<typename T, typename... U> void __print(priority_queue<T, U...> q) {
    vector<T> debugVector;
    while (!q.empty()) {
        T t = q.top();
        debugVector.push_back(t);
        q.pop();
    }
    __print(debugVector);
}
 
void _print() { cerr << "]\n"; }
 
template <typename Head, typename... Tail> void _print(const Head &H, const Tail &...T) {
    __print(H);
    if (sizeof...(T)) cerr << ", ";
    _print(T...);
}
 
#ifdef DEBUG
	#define D(...) cerr << "Line: " << __LINE__ << " [" << #__VA_ARGS__ << "] = ["; _print(__VA_ARGS__)
#else
	#define D(...)
#endif

int n, q, rt, mn[100005], out[100005], idx, par[100005][20], k, v, ans, depth[100005], tmp;
bool filled[100005];
vector<int> adj[100005];
priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;

void dfs1(int curr) {
    mn[curr] = curr;
    for (int i : adj[curr]) {
        depth[i] = depth[curr] + 1;
        dfs1(i);
        mn[curr] = min(mn[curr], mn[i]);
    }
}

void dfs2(int curr) {
    vector<pair<int, int>> ord;
    for (int i : adj[curr]) {
        ord.push_back({mn[i], i});
    }
    sort(ord.begin(), ord.end());
    for (auto [m, x] : ord) {
        dfs2(x);
    }
    out[curr] = idx++;
}

int main() {

    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin >> n >> q;
    for (int i = 1; i <= n; i++) {
        cin >> par[i][0];
        if (!par[i][0]) {
            rt = i;
            continue;
        }
        adj[par[i][0]].push_back(i);
    }

    dfs1(rt);
    dfs2(rt);

    for (int i = 1; i <= n; i++) {
        // cout << i << ": " << out[i] << " " << depth[i] << "\n";
        pq.push({out[i], i});
    }

    for (int i = 1; i < 20; i++) {
        for (int j = 1; j <= n; j++) {
            par[j][i] = par[par[j][i - 1]][i - 1];
        }
    }

    while (q--) {
        cin >> k >> v;
        if (k == 1) {
            while (v--) {
                ans = pq.top().s;
                filled[ans] = true;
                pq.pop();
            }
            cout << ans << "\n";
        } else {
            tmp = v;
            for (int i = 19; i >= 0; i--) {
                if (filled[par[tmp][i]]) {
                    tmp = par[tmp][i];
                }
            }
            cout << depth[v] - depth[tmp] << "\n";
            filled[tmp] = false;
            pq.push({out[tmp], tmp});
        }
    }

}

• Subtask 1: 25 / 25
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40
• Subtask 4: 5 / 5