Submission #733870

#	Time	Username	Problem	Language	Result	Execution time	Memory
733870		GrindMachine	Regions (IOI09_regions)	C++17	100 / 100	4911 ms	119664 KiB

regions

// Om Namah Shivaya

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 2e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;
const int B = 305;

int n, r, q;
vector<int> adj[N];
vector<int> a(N);
vector<int> id(N, -1);
vector<int> curr_cnt(N);
vector<vector<int>> ans_heavy1, ans_heavy2, pref_heavy;
int siz;
vector<int> tin(N), tout(N);
int timer = 1;

void dfs(int u, int p) {
    tin[u] = timer++;
    ll c = a[u];

    if (id[c] != -1) {
        curr_cnt[id[c]]++;
        pref_heavy[id[c]][tin[u]]++;
    }

    rep(id, siz) {
        ans_heavy1[id][c] += curr_cnt[id];
    }

    trav(v, adj[u]) {
        if (v == p) conts;
        dfs(v, u);
    }

    if (id[c] != -1) {
        curr_cnt[id[c]]--;
    }

    tout[u] = timer - 1;
}

vector<int> nodes[N];
vector<int> tins[N];

void solve(int test_case)
{
    cin >> n >> r >> q;
    cin >> a[1];

    for (int i = 2; i <= n; ++i) {
        int p, h; cin >> p >> h;
        adj[p].pb(i);
        a[i] = h;
    }

    vector<int> cnt(r + 5);
    rep1(i, n) cnt[a[i]]++;

    siz = 0;

    rep1(c, r) {
        if (cnt[c] > B) {
            id[c] = siz++;
        }
    }

    ans_heavy1 = vector<vector<int>>(siz, vector<int>(r + 5));
    ans_heavy2 = vector<vector<int>>(r + 5, vector<int>(siz));
    pref_heavy = vector<vector<int>>(siz, vector<int>(n + 5));

    dfs(1, -1);

    rep(c, siz) {
        rep1(i, n) {
            pref_heavy[c][i] += pref_heavy[c][i - 1];
        }
    }

    rep1(i, n) {
        ll l = tin[i], r = tout[i];
        rep(c, siz) {
            ll cnt = pref_heavy[c][r] - pref_heavy[c][l - 1];
            ans_heavy2[a[i]][c] += cnt;
        }
    }

    rep1(i, n) {
        nodes[a[i]].pb(i);
        tins[a[i]].pb(tin[i]);
    }

    rep1(c, r) {
        sort(all(tins[c]));
    }

    while (q--) {
        int c1, c2; cin >> c1 >> c2;
        int ans = 0;

        if (id[c1] != -1) {
            ans = ans_heavy1[id[c1]][c2];
        }
        else if (id[c2] != -1) {
            ans = ans_heavy2[c1][id[c2]];
        }
        else {
            auto &ti = tins[c2];
            trav(u, nodes[c1]) {
                int l = tin[u], r = tout[u];
                int cnt = upper_bound(all(ti), r) - lower_bound(all(ti), l);
                ans += cnt;
            }
        }

        cout << ans << endl;
    }
}

int main()
{
    fastio;

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

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 85 / 85