Submission #1067064

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067064		TheQuantiX	Werewolf (IOI18_werewolf)	C++17	49 / 100	795 ms	50516 KiB

werewolf

#include "werewolf.h"
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

constexpr ll INF = 100000000LL;

ll n, m, q, k, x, y, a, b, c;
vector<int> G[200000];
int to[200000];
int from[200000];

int bfs(ll s, ll e, ll l, ll r) {
    queue< pair<ll, bool> > q;
    q.push({s, 0});
    vector< vector<ll> > vis(n, vector<ll> (2, 0));
    vis[s][0] = 1;
    while (!q.empty()) {
        auto [x, w] = q.front();
        q.pop();
        // cout << x << ' ' << w << '\n';
        if (!vis[x][1] && x <= r) {
            q.push({x, 1});
            vis[x][1] = 1;
        }
        for (int i : G[x]) {
            if (!vis[i][w] && (w == 1 || i >= l) && (w == 0 || i <= r)) {
                q.push({i, w});
                vis[i][w] = 1;
            }
        }
    }
    // cout << '\n';
    return vis[e][1];
}

void dfs(ll x, ll p, ll num) {
    to[x] = num;
    from[num] = x;
    for (auto i : G[x]) {
        if (i != p) {
            dfs(i, x, num + 1);
        }
    }
}

struct segtree {
    ll n;
    vector<ll> mintr;
    vector<ll> maxtr;

    void build(ll x, ll l, ll r) {
        if (l == r) {
            mintr[x] = from[l];
            maxtr[x] = from[l];
            // cout << x << ' ' << mintr[x] << ' ' << maxtr[x] << '\n';
            return;
        }
        ll mid = (r + l) / 2;
        build(x * 2 + 1, l, mid);
        build(x * 2 + 2, mid + 1, r);
        mintr[x] = min(mintr[x * 2 + 1], mintr[x * 2 + 2]);
        maxtr[x] = max(maxtr[x * 2 + 1], maxtr[x * 2 + 2]);
        // cout << x << ' ' << mintr[x] << ' ' << maxtr[x] << '\n';
    }

    segtree(ll N) : n(N) {
        mintr.resize(4 * n);
        maxtr.resize(4 * n);
        build(0, 0, n - 1);
    }

    ll getmx(ll x, ll l, ll r, ll L, ll R) {
        if (r < l) {
            return -INF;
        }
        if (r < L) {
            return -INF;
        }
        if (R < l) {
            return -INF;
        }
        if (L <= l && r <= R) {
            // cout << x << ' ' << l << ' ' << r << ' ' << L << ' ' << R << '\n';
            // cout << maxtr[x] << '\n';
            return maxtr[x];
        }
        ll mid = (r + l) / 2;
        ll ans = max(getmx(x * 2 + 1, l, mid, L, R), getmx(x * 2 + 2, mid + 1, r, L, R));
        // cout << x << ' ' << l << ' ' << r << ' ' << L << ' ' << R << '\n';
        // cout << ans << '\n';
        return ans;
    }

    ll getmn(ll x, ll l, ll r, ll L, ll R) {
        if (r < l) {
            return INF;
        }
        if (r < L) {
            return INF;
        }
        if (R < l) {
            return INF;
        }
        if (L <= l && r <= R) {
            return mintr[x];
        }
        ll mid = (r + l) / 2;
        return min(getmn(x * 2 + 1, l, mid, L, R), getmn(x * 2 + 2, mid + 1, r, L, R));
    }
};

vector<int> check_validity(int N, vector<int> X, vector<int> Y, vector<int> S, vector<int> E, vector<int> L, vector<int> R) {
    n = N;
    m = X.size();
    q = S.size();
    for (int i = 0; i < m; i++) {
        G[X[i]].push_back(Y[i]);
        G[Y[i]].push_back(X[i]);
    }
    vector<int> ans;
    if (n <= 3000 && m <= 6000 && q <= 3000) {
    // if (0) {
        for (int i = 0; i < q; i++) {
            ans.push_back(bfs(S[i], E[i], L[i], R[i]));
        }
    }
    else {
        ans.resize(q);
        ll x = 0;
        for (int i = 0; i < n; i++) {
            if (G[i].size() == 1) {
                x = i;
                break;
            }
        }
        dfs(x, -1, 0);
        // cout << (*from.rbegin()).first << endl;
        segtree sg(n);
        // cout << sg.getmx(0, 0, n - 1, 3, 6) << '\n';
        // exit(0);
        for (int i = 0; i < q; i++) {
            ll x = to[S[i]];
            ll y = to[E[i]];
            // cout << x << ' ' << y << '\n';
            if (x < y) {
                ll l = x, r = y + 1;
                while (r > l) {
                    ll mid = (r + l) / 2;
                    if (sg.getmn(0, 0, n - 1, x, mid) < L[i]) {
                        r = mid;
                    }
                    else {
                        l = mid + 1;
                    }
                }
                ans[i] = 1;
                if (l == x) {
                    ans[i] = 0;
                }
                if (from[l - 1] > R[i]) {
                    ans[i] = 0;
                }
                if (from[y] > R[i]) {
                    ans[i] = 0;
                }
                if (sg.getmx(0, 0, n - 1, l, y) > R[i]) {
                    ans[i] = 0;
                }
            }
            else {
                swap(x, y);
                // cout << x << ' ' << y << '\n';
                ll l = x, r = y + 1;
                while (r > l) {
                    // cout << l << ' ' << r << '\n';
                    ll mid = (r + l) / 2;
                    // cout << x << ' ' << mid << endl;
                    // cout << sg.getmx(0, 0, n - 1, x, mid) << ' ' << R[i] << '\n';
                    if (sg.getmx(0, 0, n - 1, x, mid) > R[i]) {
                        r = mid;
                    }
                    else {
                        l = mid + 1;
                    }
                    // cout << '\n';
                }
                // cout << l << '\n';
                // cout << "DEBUG" << endl;
                ans[i] = 1;
                if (l == x) {
                    ans[i] = 0;
                }
                if (from[l - 1] < L[i]) {
                    ans[i] = 0;
                }
                if (from[y] < L[i]) {
                    ans[i] = 0;
                }
                if (sg.getmn(0, 0, n - 1, l, y) < L[i]) {
                    ans[i] = 0;
                }
            }
        }
    }
    return ans;
}

• Subtask 1: 7 / 7
• Subtask 2: 8 / 8
• Subtask 3: 34 / 34
• Subtask 4: 0 / 51