oj.uz

Submission #1022676

# Submission time Handle Problem Language Result Execution time Memory
1022676 2024-07-13T22:27:30 Z efishel Werewolf (IOI18_werewolf) C++17
100 / 100
 2165 ms 401984 KB 
#include "werewolf.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector <ll>;
using vi = vector <int>;
using ii = pair <ll, ll>;
using vii = vector <ii>;

const ll MAXN = 2E5+16;

struct Edge {
    ll u, v, w;
};

struct DSU {
    vll par, sz, nn, bioPar;
    vector <vll> anc;
    vll tin, tout;
    ll timer;
    ll n;
    // vector <vii> qs;
    // vll vans;
    vii funnyEgs;
    vector <vll> adj;
    function <ll(ll, ll)> a;

    ll newId () {
        ll id = par.size();
        par.push_back(id);
        bioPar.push_back(id);
        sz.push_back(1);
        adj.push_back(vll({}));
        nn.push_back(-15);
        tin.push_back(-15);
        tout.push_back(-15);
        anc.push_back(vll({}));
        return id;
    }

    DSU (ll n, function <ll(ll, ll)> a): par(n), sz(n, 1), nn(n), bioPar(n), tin(n, -15), tout(n, -15), timer(0), anc(n), /* qs(n, vii({})), */ funnyEgs(0), adj(n, vll({})), a(a), n(n) { iota(par.begin(), par.end(), 0); iota(nn.begin(), nn.end(), 0); }

    ll find (ll u) { return u == par[u] ? u : par[u] = find(par[u]); }

    void join (ll u, ll v) {
        // cerr << "at-1\n";
        u = find(u);
        v = find(v);
        if (u == v) return;
        // cerr << "at0\n";
        ll id = newId();
        // cerr << "at1\n";
        adj[id].push_back(u);
        adj[id].push_back(v);
        // cerr << "at2\n";
        bioPar[id] = id;
        // cerr << "at3\n";
        bioPar[u] = par[u] = id;
        bioPar[v] = par[v] = id;
        // cerr << "at4\n";
        nn[id] = a(nn[u], nn[v]);
        // cerr << id << " par of " << u << ' ' << v << '\n';
        // cerr << "at5\n";
        // if (qs[u].size() > qs[v].size()) swap(u, v);
        // for (auto [vth, qid] : qs[u]) {
        //     if (find(vth) == v) {
        //         vans[qid] = id;
        //     } else qs[v].push_back({ vth, qid });
        // }
    }

    ll findRoot (ll u, ll x) {
        for (ll bit = 17; bit >= 0; bit--) {
            if (a(nn[anc[u][bit]], x) != x) continue;
            u = anc[u][bit];
        }
        assert(a(nn[u], x) == x);
        if (u != anc[u][0]) assert(a(nn[anc[u][0]], x) != x);
        return u;
        // if (a(nn[bioPar[u]], x) == x) return findRoot(bioPar[u], x);
        // return u;
    }

    vll doDfs (ll u, ll x) {
        ll ahm = findRoot(u, x);
        vll ans;
        dfs(ahm, ans);
        return ans;
    }

    ii getRange (ll u, ll x) {
        ll ahm = findRoot(u, x);
        return { tin[ahm], tout[ahm] };
    }

    void buildBinLift () {
        for (ll bit = 1; bit < 18; bit++) {
            for (ll u = 0; u < anc.size(); u++) {
                assert(anc[u].size() == bit);
                anc[u].push_back(anc[anc[u][bit-1]][bit-1]);
            }
        }
    }

    void dfs (ll u, vll &sub) {
        tin[u] = timer;
        if (u < n) timer++;
        // cerr << nn[u] << ' ';
        assert(adj[u].empty() == (u < n));
        if (adj[u].empty()) sub.push_back(u);
        anc[u] = { bioPar[u] };
        for (ll v : adj[u]) {
            dfs(v, sub);
            // cerr << nn[u] << ' ';
        }
        tout[u] = timer-1;
    }

    // void addQ (ll u, ll v, ll qid) {
    //     assert(qid == vans.size());
    //     qs[u].push_back({ v, qid });
    //     qs[v].push_back({ u, qid });
    //     vans.push_back(-15);
    // }
};

struct SegTree {
    vector <vll> tree;
    // vll tree;
    ll n;

    SegTree (ll n): tree(2*n, vll({})), n(n) {}
    // SegTree (ll n): tree(n, -15), n(n) {}

    void update (ll id, ll val) {
        for (id += n; id > 0; id >>= 1)
            tree[id].push_back(val);
    }

    // void update (ll id, ll val) {
    //     tree[id] = val;
    // }

    void build () {
        for (ll id = 0; id < 2*n; id++)
            sort(tree[id].begin(), tree[id].end());
    }

    // bool query (ll ql, ll qr, ll l, ll r) {
    //     bool ans = false;
    //     for (ll i = ql; i <= qr; i++)
    //         ans |= l <= tree[i] && tree[i] <= r;
    //     return ans;
    // }

    bool query (ll ql, ll qr, ll l, ll r) {
        bool ans = false;
        for (ql += n, qr += n+1; ql < qr; ql >>= 1, qr >>= 1) {
            if (ql&1) { ans |= upper_bound(tree[ql].begin(), tree[ql].end(), r) - lower_bound(tree[ql].begin(), tree[ql].end(), l); ql++; }
            if (qr&1) { --qr; ans |= upper_bound(tree[qr].begin(), tree[qr].end(), r) - lower_bound(tree[qr].begin(), tree[qr].end(), l); }
        }
        return ans;
    }
};

vi check_validity (int n, vi us, vi vs, vi s, vi e, vi vl, vi vr) {
    ll Q = s.size();
    vector <Edge> egsMn, egsMx;
    for (ll i = 0; i < us.size(); i++) {
        // adj[us[i]].push_back(vs[i]);
        // adj[vs[i]].push_back(us[i]);
        egsMn.push_back({ us[i], vs[i], min(us[i], vs[i]) });
        egsMx.push_back({ us[i], vs[i], max(us[i], vs[i]) });
    }
    sort(egsMn.begin(), egsMn.end(), [&](Edge a, Edge b) { return a.w > b.w; });
    sort(egsMx.begin(), egsMx.end(), [&](Edge a, Edge b) { return a.w < b.w; });
    DSU dsuMn(n, [&](ll a, ll b) { return min(a, b); });
    for (auto [u, v, w] : egsMn) {
        // cerr << u << ' ' << v << ' ' << w << '\n';
        // cerr << "joining\n";
        dsuMn.join(u, v);
        // cerr << "joiningee\n";
    }
    DSU dsuMx(n, [&](ll a, ll b) { return max(a, b); });
    for (auto [u, v, w] : egsMx) {
        // cerr << u << ' ' << v << ' ' << w << '\n';
        // cerr << "joining\n";
        dsuMx.join(u, v);
        // cerr << "joiningee\n";
    }
    vll ordMn, ordMx;
    dsuMn.dfs(dsuMn.par.size()-1, ordMn);
    dsuMn.buildBinLift();
    dsuMx.dfs(dsuMx.par.size()-1, ordMx);
    dsuMx.buildBinLift();
    SegTree st(n);
    for (ll u = 0; u < n; u++)
        st.update(dsuMx.tin[u], dsuMn.tin[u]);
    st.build();
    // cerr <<  << '\n';
    vi ans(Q, -15);
    for (ll qid = 0; qid < Q; qid++) {
        assert(vl[qid] <= s[qid]);
        assert(e[qid] <= vr[qid]);
        assert(vl[qid] <= vr[qid]);
        assert(e[qid] != s[qid]);
        // ll ancMn = dsuMn.findRoot(s[qid], vl[qid]);
        // ll ancMx = dsuMx.findRoot(e[qid], vr[qid]);
        // vll accMn = dsuMn.doDfs(s[qid], vl[qid]);
        // vll accMx = dsuMx.doDfs(e[qid], vr[qid]);
        auto [lMn, rMn] = dsuMn.getRange(s[qid], vl[qid]);
        auto [lMx, rMx] = dsuMx.getRange(e[qid], vr[qid]);
        // cerr << lMn << ' ' << rMn << '\n';
        // cerr << lMx << ' ' << rMx << '\n';
        // sort(accMn.begin(), accMn.end());
        ans[qid] = st.query(lMx, rMx, lMn, rMn);
        // for (ll i : accMx) {
            // ans[qid] |= binary_search(accMn.begin(), accMn.end(), i);
        // }
        // for (ll i : accMn) cerr << i << ' '; cerr << '\n';
        // for (ll i : accMx) cerr << i << ' '; cerr << '\n';
    }
    // cerr << "ANS DONE\n";
    return ans;
}

Compilation message

werewolf.cpp: In constructor 'DSU::DSU(ll, std::function<long long int(long long int, long long int)>)':
werewolf.cpp:20:8: warning: 'DSU::timer' will be initialized after [-Wreorder]
   20 |     ll timer;
      |        ^~~~~
werewolf.cpp:18:18: warning:   'std::vector<std::vector<long long int> > DSU::anc' [-Wreorder]
   18 |     vector <vll> anc;
      |                  ^~~
werewolf.cpp:41:5: warning:   when initialized here [-Wreorder]
   41 |     DSU (ll n, function <ll(ll, ll)> a): par(n), sz(n, 1), nn(n), bioPar(n), tin(n, -15), tout(n, -15), timer(0), anc(n), /* qs(n, vii({})), */ funnyEgs(0), adj(n, vll({})), a(a), n(n) { iota(par.begin(), par.end(), 0); iota(nn.begin(), nn.end(), 0); }
      |     ^~~
werewolf.cpp:26:27: warning: 'DSU::a' will be initialized after [-Wreorder]
   26 |     function <ll(ll, ll)> a;
      |                           ^
werewolf.cpp:21:8: warning:   'll DSU::n' [-Wreorder]
   21 |     ll n;
      |        ^
werewolf.cpp:41:5: warning:   when initialized here [-Wreorder]
   41 |     DSU (ll n, function <ll(ll, ll)> a): par(n), sz(n, 1), nn(n), bioPar(n), tin(n, -15), tout(n, -15), timer(0), anc(n), /* qs(n, vii({})), */ funnyEgs(0), adj(n, vll({})), a(a), n(n) { iota(par.begin(), par.end(), 0); iota(nn.begin(), nn.end(), 0); }
      |     ^~~
werewolf.cpp: In member function 'void DSU::buildBinLift()':
werewolf.cpp:98:30: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |             for (ll u = 0; u < anc.size(); u++) {
      |                            ~~^~~~~~~~~~~~
In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from werewolf.cpp:2:
werewolf.cpp:99:38: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   99 |                 assert(anc[u].size() == bit);
      |                        ~~~~~~~~~~~~~~^~~~~~
werewolf.cpp: In function 'vi check_validity(int, vi, vi, vi, vi, vi, vi)':
werewolf.cpp:169:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  169 |     for (ll i = 0; i < us.size(); i++) {
      |                    ~~^~~~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 600 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 0 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 600 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 0 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 17 ms 5876 KB Output is correct
11 Correct 18 ms 6232 KB Output is correct
12 Correct 11 ms 5912 KB Output is correct
13 Correct 12 ms 6124 KB Output is correct
14 Correct 12 ms 6064 KB Output is correct
15 Correct 12 ms 6112 KB Output is correct

Subtask #3
34.0 / 34.0

# Verdict Execution time Memory Grader output
1 Correct 1453 ms 375552 KB Output is correct
2 Correct 1656 ms 379952 KB Output is correct
3 Correct 1615 ms 385700 KB Output is correct
4 Correct 1405 ms 384920 KB Output is correct
5 Correct 1401 ms 384616 KB Output is correct
6 Correct 1439 ms 384492 KB Output is correct
7 Correct 1384 ms 384116 KB Output is correct
8 Correct 1472 ms 388468 KB Output is correct
9 Correct 1158 ms 385912 KB Output is correct
10 Correct 971 ms 384800 KB Output is correct
11 Correct 1089 ms 384884 KB Output is correct
12 Correct 1204 ms 384540 KB Output is correct
13 Correct 1680 ms 388808 KB Output is correct
14 Correct 1700 ms 388756 KB Output is correct
15 Correct 1684 ms 388980 KB Output is correct
16 Correct 1669 ms 388976 KB Output is correct
17 Correct 1384 ms 384212 KB Output is correct

Subtask #4
51.0 / 51.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 600 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 0 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 17 ms 5876 KB Output is correct
11 Correct 18 ms 6232 KB Output is correct
12 Correct 11 ms 5912 KB Output is correct
13 Correct 12 ms 6124 KB Output is correct
14 Correct 12 ms 6064 KB Output is correct
15 Correct 12 ms 6112 KB Output is correct
16 Correct 1453 ms 375552 KB Output is correct
17 Correct 1656 ms 379952 KB Output is correct
18 Correct 1615 ms 385700 KB Output is correct
19 Correct 1405 ms 384920 KB Output is correct
20 Correct 1401 ms 384616 KB Output is correct
21 Correct 1439 ms 384492 KB Output is correct
22 Correct 1384 ms 384116 KB Output is correct
23 Correct 1472 ms 388468 KB Output is correct
24 Correct 1158 ms 385912 KB Output is correct
25 Correct 971 ms 384800 KB Output is correct
26 Correct 1089 ms 384884 KB Output is correct
27 Correct 1204 ms 384540 KB Output is correct
28 Correct 1680 ms 388808 KB Output is correct
29 Correct 1700 ms 388756 KB Output is correct
30 Correct 1684 ms 388980 KB Output is correct
31 Correct 1669 ms 388976 KB Output is correct
32 Correct 1384 ms 384212 KB Output is correct
33 Correct 1824 ms 385520 KB Output is correct
34 Correct 363 ms 46584 KB Output is correct
35 Correct 2165 ms 389256 KB Output is correct
36 Correct 1631 ms 385396 KB Output is correct
37 Correct 2124 ms 388212 KB Output is correct
38 Correct 1777 ms 386160 KB Output is correct
39 Correct 1991 ms 392568 KB Output is correct
40 Correct 1645 ms 401736 KB Output is correct
41 Correct 1613 ms 387492 KB Output is correct
42 Correct 1170 ms 385396 KB Output is correct
43 Correct 2033 ms 396408 KB Output is correct
44 Correct 1872 ms 388472 KB Output is correct
45 Correct 1460 ms 393340 KB Output is correct
46 Correct 1747 ms 392696 KB Output is correct
47 Correct 1732 ms 389236 KB Output is correct
48 Correct 1675 ms 388828 KB Output is correct
49 Correct 1728 ms 388972 KB Output is correct
50 Correct 1761 ms 388864 KB Output is correct
51 Correct 1481 ms 401984 KB Output is correct
52 Correct 1490 ms 401868 KB Output is correct