Submission #874785

#	Time	Username	Problem	Language	Result	Execution time	Memory
874785		LOLOLO	Ball Machine (BOI13_ballmachine)	C++14	4.29 / 100	150 ms	28464 KiB

ballmachine

#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

#define           f    first
#define           s    second
#define           pb    push_back
#define           ep    emplace
#define           eb    emplace_back
#define           lb    lower_bound
#define           ub    upper_bound
#define       all(x)    x.begin(), x.end()
#define      rall(x)    x.rbegin(), x.rend()
#define   uniquev(v)    sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define     mem(f,x)    memset(f , x , sizeof(f))
#define        sz(x)    (int)(x).size()
#define  __lcm(a, b)    (1ll * ((a) / __gcd((a), (b))) * (b))
#define          mxx    *max_element
#define          mnn    *min_element
#define    cntbit(x)    __builtin_popcountll(x)
#define       len(x)    (int)(x.length())

const int N = 2e5 + 100;
vector <int> ed[N];
int sp[N][20], sz[N], is[N], dep[N], mn[N];

void dfs(int u, int v) {
    mn[u] = u;
    dep[u] = dep[v] + 1;
    for (auto x : ed[u]) {
        dfs(x, u);
        mn[u] = min(mn[u], mn[x]);
    }
}

ll solve() {
    mem(mn, 0x3f);

    ll n, q, root = 0;
    cin >> n >> q;

    for (int i = 1; i <= n; i++) {
        int x;
        cin >> x;
        if (x) {
            ed[x].pb(i);
            sz[x]++;
            sp[i][0] = x;
        } else {
            sp[i][0] = i;
            root = i;
        }
    }

    dfs(root, root);

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

    set <pair <int, int>> st;
    for (int i = 1; i <= n; i++) {
        if (sz[i] == 0) {
            st.insert({mn[i], i});
        }
    }

    while (q--) {
        int t, x;
        cin >> t >> x;

        if (t == 1) {
            int pr = 0;
            for (int i = 1; i <= x; i++) {
                auto t = *st.begin();
                st.erase(t);
                pr = t.s;
                
                sz[sp[pr][0]]--;
                if (sz[sp[pr][0]] == 0) {
                    st.insert({mn[sp[pr][0]], sp[pr][0]});
                }
            }

            cout << pr << '\n';
        } else {
            int cnt = 0, v = x;
            for (int i = 19; i >= 0; i--) {
                if (st.find({mn[sp[x][i]], sp[x][i]}) != st.end()) {
                    x = sp[x][i];
                    cnt += (1 << i);
                }
            }

            sz[sp[x][0]]++;

            if (sz[sp[x][0]] == 1) {
                st.erase({mn[sp[x][0]], sp[x][0]});
            }

            st.insert({mn[x], x});

            cout << dep[v] - dep[x] << '\n';
        }
    }


    return 0;
}

int main(){
    ios_base::sync_with_stdio(false); 
    cin.tie(NULL);
    cout.tie(NULL);

    int t = 1;
    //cin >> t;

    while (t--) {
        solve();
        //cout << solve() << '\n';
    }

    return 0;
}

• Subtask 1: 0 / 25
• Subtask 2: 4.285714285714286 / 30
• Subtask 3: 0 / 40
• Subtask 4: 0 / 5