Submission #968343

#	Time	Username	Problem	Language	Result	Execution time	Memory
968343		Mher777	Ball Machine (BOI13_ballmachine)	C++17	16.11 / 100	400 ms	39688 KiB

ballmachine

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <array>
#include <string>
#include <algorithm>
#include <cmath>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <utility>
#include <random>
#include <cassert>
#include <fstream>
using namespace std;
mt19937 rnd(7069);

/* -------------------- Typedefs -------------------- */

typedef int itn;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef float fl;
typedef long double ld;

/* -------------------- Usings -------------------- */

using vi = vector<int>;
using vll = vector<ll>;
using mii = map<int, int>;
using mll = map<ll, ll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

/* -------------------- Defines -------------------- */

#define ff first
#define ss second
#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define mpr make_pair
#define yes cout<<"Yes\n"
#define no cout<<"No\n"
#define all(x) (x).begin(), (x).end()
#define USACO freopen("feast.in", "r", stdin); freopen("feast.out", "w", stdout);

/* -------------------- Constants -------------------- */

const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18) + 5ll;
const ll MOD = ll(1000000007);
const ll MOD2 = ll(998244353);

/* -------------------- Functions -------------------- */

void fastio() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

void precision(int x) {
    cout.setf(ios::fixed | ios::showpoint);
    cout.precision(x);
}

ll gcd(ll a, ll b) {
    if (a == 0 || b == 0) return(max(a, b));
    while (b) {
        a %= b;
        swap(a, b);
    }
    return a;
}

ll lcm(ll a, ll b) {
    return a / gcd(a, b) * b;
}

ll range_sum(ll a, ll b) {
    if (a > b) return 0ll;
    ll dif = a - 1, cnt = b - a + 1;
    ll ans = ((b - a + 1) * (b - a + 2)) / 2;
    ans += ((b - a + 1) * dif);
    return ans;
}

string dec_to_bin(ll a) {
    string s = "";
    for (ll i = a; i > 0; ) {
        ll k = i % 2;
        i /= 2;
        char c = k + 48;
        s += c;
    }
    if (a == 0) {
        s = "0";
    }
    reverse(all(s));
    return s;
}

ll bin_to_dec(string s) {
    ll num = 0;
    for (int i = 0; i < s.size(); i++) {
        num *= 2ll;
        num += (s[i] - '0');
    }
    return num;
}

ll factorial_by_mod(ll n, ll mod) {
    ll ans = 1;
    ll num;
    for (ll i = 1; i <= n; ++i) {
        num = i % mod;
        ans *= num;
        ans %= mod;
    }
    return ans;
}

int isPrime(ll a) {
    if (a == 1) return 0;
    for (ll i = 2; i * i <= a; i++) {
        if (a % i == 0) return 0;
    }
    return 1;
}

ll binpow(ll a, ll b) {
    if (!a) return 0;
    ll ans = 1;
    while (b) {
        if (b & 1) {
            ans *= a;
        }
        b >>= 1;
        a *= a;
    }
    return ans;
}

ll binpow_by_mod(ll a, ll b, ll mod) {
    if (!a) return 0;
    ll ans = 1;
    while (b) {
        if (b & 1) {
            ans *= a;
            ans %= mod;
        }
        b >>= 1;
        a *= a;
        a %= mod;
    }
    return ans;
}

/* -------------------- Solution -------------------- */

const int N = 100005, M = 31;
int id[N], id_rev[N], p[N], up[N][M], dep[N], t[N * 4], lazy[N * 4], mark[N * 4], ran[N * 4];
vi g[N];
int n, q, lg, root, cur;

void prop(int pos) {
    if (!mark[pos]) return;
    t[2 * pos] = ran[2 * pos] * lazy[pos];
    t[2 * pos + 1] = ran[2 * pos + 1] * lazy[pos];
    lazy[2 * pos] = lazy[2 * pos + 1] = lazy[pos];
    mark[2 * pos] = mark[2 * pos + 1] = 1;
    mark[pos] = 0;
}

void bld(int l = 1, int r = n, int pos = 1) {
    ran[pos] = r - l + 1;
    if (l == r) return;
    int mid = (l + r) / 2;
    bld(l, mid, 2 * pos);
    bld(mid + 1, r, 2 * pos + 1);
}

int qry(int l, int r, int tl = 1, int tr = n, int pos = 1) {
    if (l == tl && r == tr) {
        return t[pos];
    }
    prop(pos);
    int mid = (tl + tr) / 2;
    if (mid >= r) {
        return qry(l, r, tl, mid, 2 * pos);
    }
    if (mid < l) {
        return qry(l, r, mid + 1, tr, 2 * pos + 1);
    }
    return qry(l, mid, tl, mid, 2 * pos) + qry(mid + 1, r, mid + 1, tr, 2 * pos + 1);
}

void upd(int l, int r, int val, int tl = 1, int tr = n, int pos = 1) {
    if (l == tl && r == tr) {
        t[pos] = val * ran[pos];
        lazy[pos] = val;
        mark[pos] = 1;
        return;
    }
    prop(pos);
    int mid = (tl + tr) / 2;
    if (mid >= r) {
        upd(l, r, val, tl, mid, 2 * pos);
    }
    else if (mid < l) {
        upd(l, r, val, mid + 1, tr, 2 * pos + 1);
    }
    else {
        upd(l, mid, val, tl, mid, 2 * pos);
        upd(mid + 1, r, val, mid + 1, tr, 2 * pos + 1);
    }
    t[pos] = t[2 * pos] + t[2 * pos + 1];
}

void dfs(int u = root, int depth = 0) {
    dep[u] = depth;
    up[u][0] = p[u];
    for (int i = 1; i <= lg; ++i) {
        up[u][i] = up[up[u][i - 1]][i - 1];
    }
    for (auto to : g[u]) {
        dfs(to, depth + 1);
    }
    id[u] = ++cur;
    id_rev[cur] = u;
}

int get_up(int u, int cnt) {
    for (int i = lg; i >= 0; --i) {
        if ((1 << i) <= cnt) {
            cnt -= (1 << i);
            u = up[u][i];
        }
    }
    return u;
}

void slv() {
    cin >> n >> q;
    lg = log2(n) + 1;
    for (int i = 1; i <= n; ++i) {
        cin >> p[i];
        if (!p[i]) root = p[i] = i;
        else g[p[i]].pub(i);
    }
    dfs();
    bld();
    while (q--) {
        int type, x;
        cin >> type >> x;
        if (type == 1) {
            int l = 1, r = n, mid, ind = 0;
            while (l <= r) {
                mid = (l + r) / 2;
                int cnt = qry(1, mid);
                if (mid - cnt < x) {
                    l = mid + 1;
                }
                else if (mid - cnt == x) {
                    ind = mid;
                    r = mid - 1;
                }
                else {
                    r = mid - 1;
                }
            }
            upd(1, ind, 1);
            cout << id_rev[ind] << '\n';
            continue;
        }
        int l = 1, r = dep[x], mid, ans = 0, gag = x;
        while (l <= r) {
            mid = (l + r) / 2;
            int u = get_up(x, mid);
            if (qry(id[u], id[u])) {
                gag = u;
                ans = mid;
                l = mid + 1;
            }
            else {
                r = mid - 1;
            }
        }
        upd(id[gag], id[gag], 0);
        cout << ans << '\n';
    }
}

void cs() {
    int tstc = 1;
    //cin >> tstc;
    while (tstc--) {
        slv();
    }
}

void precalc() {
    return;
}

int main() {
    fastio();
    precalc();
    //precision(0);
    cs();
    return 0;
}

Compilation message (stderr)

ballmachine.cpp: In function 'll range_sum(ll, ll)':
ballmachine.cpp:95:21: warning: unused variable 'cnt' [-Wunused-variable]
   95 |     ll dif = a - 1, cnt = b - a + 1;
      |                     ^~~
ballmachine.cpp: In function 'll bin_to_dec(std::string)':
ballmachine.cpp:118:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  118 |     for (int i = 0; i < s.size(); i++) {
      |                     ~~^~~~~~~~~~

• Subtask 1: 0 / 25
• Subtask 2: 6.428571428571429 / 30
• Subtask 3: 8.571428571428571 / 40
• Subtask 4: 1.1111111111111112 / 5