Submission #872123

#	Time	Username	Problem	Language	Result	Execution time	Memory
872123		sleepntsheep	Ball Machine (BOI13_ballmachine)	C++17	100 / 100	440 ms	19040 KiB

ballmachine

#include <iostream>
#include <cassert>
#include <queue>
#include <bitset>
#include <cstring>
#include <vector>
#include <algorithm>
#include <deque>
#include <set>
#include <utility>
#include <functional>
#include <array>

using i64 = long long;
using u64 = unsigned long long;
using f64 = double;
using f80 = long double;

using namespace std;
#define ALL(x) x.begin(), x.end()
#define ShinLena cin.tie(nullptr)->sync_with_stdio(false);
#define N 100000

int root, n, q, L[N], J[N], P[N], tout[N], rv[N], timer, t[N<<1], low[N];
signed char lz[N<<1];
vector<int> g[N];

inline void push(int v, int l, int r)
{
    if (-1 == lz[v]) return;
    t[v] = lz[v] * (r-l+1);
    if (l != r) 
    {
        int m = (l+r)/2, vl=v+1, vr=v+(m-l+1)*2;
        lz[vl] = lz[vr] = lz[v];
    }
    lz[v] = -1;
}

int qry(int x, int y, int v = 0, int l = 0, int r = n - 1)
{
    push(v, l, r);
    if (y < l || r < x) return 0;
    if (x <= l && r <= y) return t[v];
    int m = (l+r)/2, vl =v + 1, vr=v+(m-l+1)*2;
    return qry(x, y, vl, l, m) + qry(x, y, vr, m+1, r);
}

void update(int x, int y, int k, int v = 0, int l = 0, int r = n - 1)
{
    push(v, l, r);
    if (y < l || r < x) return;
    if (x <= l && r <= y) {lz[v] = k; push(v, l, r); return; }
    int m = (l+r)/2, vl =v + 1, vr=v+(m-l+1)*2;
    update(x, y, k, vl, l, m), update(x, y, k, vr, m+1, r);
    t[v] = t[vl] + t[vr];
}

inline int highest(int u)
{
    for (; u != P[u]; )
    {
        if (qry(tout[J[u]], tout[J[u]])) u = J[u];
        else if (qry(tout[P[u]], tout[P[u]])) u = P[u];
        else break;
    }
    return u;
}

void dfs(int u)
{
    for (auto v : g[u])
    {
        P[v] = u;
        J[v] = (L[u] - L[J[u]] == L[J[u]] - L[J[J[u]]]) ? J[J[u]] : u;
        L[v] = L[u] + 1;
        dfs(v);
    }
    rv[tout[u] = timer++] = u;
}

void init()
{
    ShinLena;
    cin >> n >> q;
    for (int i = 0; i < n; ++i) cin >> P[i], (P[i] ? void(g[P[i]-1].push_back(i)) : void(root = i));

    function<void(int)> dfs0 = [&](int u)
    {
        low[u] = u;
        for (auto v : g[u]) dfs0(v), low[u] = min(low[u], low[v]);
    };
    dfs0(root);

    for (int i = 0; i < n; ++i) sort(ALL(g[i]), [](int a, int b){ return low[a]<low[b]; });

    dfs(P[root] = J[root] = root);
    assert(timer == n);

    memset(lz, -1, sizeof lz);
}

void answer()
{
    for (int l, r, t, k; q--;)
    {
        cin >> t >> k;
        if (t == 1)
        {
            for (l = 0, r = n - 1; l <= r; )
            {
                int m = (l+r)/2;
                if (m + 1 - qry(0, m) >= k) r = m - 1;
                else l = m + 1;
            }
            update(0, r+1, 1);
            cout << rv[r+1] + 1 << '\n';
        }
        else
        {
            r = highest(k-1);
            update(tout[r], tout[r], 0);
            cout << L[k-1] - L[r] << '\n';
        }
    }
}

int main()
{
    init();
    answer();

    return 0;
}

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