Submission #838481

#	Time	Username	Problem	Language	Result	Execution time	Memory
838481		Forested	Political Development (BOI17_politicaldevelopment)	C++17	16 / 100	3071 ms	524288 KiB

politicaldevelopment

#ifndef LOCAL
#define FAST_IO
#endif

// ============
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

#define OVERRIDE(a, b, c, d, ...) d
#define REP2(i, n) for (i32 i = 0; i < (i32)(n); ++i)
#define REP3(i, m, n) for (i32 i = (i32)(m); i < (i32)(n); ++i)
#define REP(...) OVERRIDE(__VA_ARGS__, REP3, REP2)(__VA_ARGS__)
#define PER(i, n) for (i32 i = (i32)(n) - 1; i >= 0; --i)
#define ALL(x) begin(x), end(x)

using namespace std;

using u32 = unsigned int;
using u64 = unsigned long long;
using i32 = signed int;
using i64 = signed long long;
using f64 = double;
using f80 = long double;

template <typename T>
using Vec = vector<T>;

template <typename T>
bool chmin(T &x, const T &y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}
template <typename T>
bool chmax(T &x, const T &y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}

#ifdef INT128

using u128 = __uint128_t;
using i128 = __int128_t;

istream &operator>>(istream &is, i128 &x) {
    i64 v;
    is >> v;
    x = v;
    return is;
}
ostream &operator<<(ostream &os, i128 x) {
    os << (i64)x;
    return os;
}
istream &operator>>(istream &is, u128 &x) {
    u64 v;
    is >> v;
    x = v;
    return is;
}
ostream &operator<<(ostream &os, u128 x) {
    os << (u64)x;
    return os;
}

#endif

[[maybe_unused]] constexpr i32 INF = 1000000100;
[[maybe_unused]] constexpr i64 INF64 = 3000000000000000100;
struct SetUpIO {
    SetUpIO() {
#ifdef FAST_IO
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
#endif
        cout << fixed << setprecision(15);
    }
} set_up_io;
// ============

#ifdef DEBUGF
#else
#define DBG(x) (void)0
#endif

int main() {
    i32 n, k;
    cin >> n >> k;
    Vec<Vec<i32>> edge(n, Vec<i32>(n, 0));
    Vec<i32> deg(n);
    REP(i, n) {
        cin >> deg[i];
        REP(j, deg[i]) {
            i32 v;
            cin >> v;
            edge[i][v] = 1;
        }
    }
    priority_queue<pair<i32, i32>, Vec<pair<i32, i32>>, greater<>> pq;
    REP(i, n) {
        pq.emplace(deg[i], i);
    }
    Vec<i32> alive(n, 1);
    i32 ans = 0;
    while (!pq.empty()) {
        auto [_, v] = pq.top();
        pq.pop();
        if (!alive[v]) {
            continue;
        }
        Vec<i32> lis;
        REP(u, n) {
            if (alive[u] && edge[v][u]) {
                lis.push_back(u);
            }
        }
        i32 d = (i32)lis.size();
        REP(st, 1 << d) {
            bool ok = true;
            REP(i, d) {
                if (!(st & (1 << i))) {
                    continue;
                }
                REP(j, i) {
                    if (!(st & (1 << j))) {
                        continue;
                    }
                    if (!edge[lis[i]][lis[j]]) {
                        ok = false;
                    }
                }
            }
            if (ok) {
                chmax(ans, __builtin_popcount(st) + 1);
            }
        }
        alive[v] = 0;
        REP(u, n) {
            if (alive[u]) {
                pq.emplace(--deg[u], u);
            }
        }
    }
    cout << ans << '\n';
}

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 0 / 23
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23