Submission #1073953

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073953		Plurm	Amusement Park (CEOI19_amusementpark)	C++11	7 / 100	2 ms	3420 KiB

amusementpark

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

map<int, int> dp[32768];
int cnt[32768];
map<pair<int, int>, int> mem[32768];
int n, m;
bool check_valid_layer(const vector<pair<int, int>> &edges, int mask) {
    for (int i = 0; i < n; i++) {
        if ((mask & (1 << i)) == 0)
            continue;
        for (int j = 0; j < i; j++) {
            if ((mask & (1 << j)) == 0)
                continue;
            if (find(edges.begin(), edges.end(), make_pair(i, j)) !=
                    edges.end() ||
                find(edges.begin(), edges.end(), make_pair(j, i)) !=
                    edges.end()) {
                return false;
            }
        }
    }
    return true;
}
bool check_condition(const vector<pair<int, int>> &edges, int mask_old,
                     int mask_new) {
    if (mask_old == 0)
        return true;
    for (int i = 0; i < n; i++) {
        if ((mask_new & (1 << i)) == 0)
            continue;
        bool ok = false;
        for (int j = 0; j < n; j++) {
            if ((mask_old & (1 << j)) == 0)
                continue;
            if (find(edges.begin(), edges.end(), make_pair(j, i)) !=
                    edges.end() ||
                find(edges.begin(), edges.end(), make_pair(i, j)) !=
                    edges.end())
                ok = true;
        }
        if (!ok)
            return false;
    }
    return true;
}
const int MOD = 998244353;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m;
    vector<pair<int, int>> edges;
    for (int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        u--;
        v--;
        edges.push_back({u, v});
    }
    for (int front = 1; front < (1 << n); front++) {
        if (!check_valid_layer(edges, front))
            continue;
        for (int incoming = 1; incoming < (1 << n); incoming++) {
            if (!check_valid_layer(edges, incoming))
                continue;
            if (front & incoming)
                continue;
            if (!check_condition(edges, front, incoming))
                continue;
            for (int scanned = 0; scanned < (1 << n); scanned++) {
                if (scanned & (front | incoming))
                    continue;
                if (!check_condition(edges, scanned, front))
                    continue;
                int cost = 0;
                for (int i = 0; i < n; i++) {
                    if (((scanned | front) & (1 << i)) == 0)
                        continue;
                    for (int j = 0; j < n; j++) {
                        if ((incoming & (1 << j)) == 0)
                            continue;
                        if (find(edges.begin(), edges.end(), make_pair(j, i)) !=
                            edges.end())
                            cost++;
                    }
                }
                mem[scanned | front][make_pair(front, incoming)] = cost;
                // cout << "MEM " << scanned << " " << front << " " << incoming
                //      << ": " << cost << endl;
            }
        }
    }
    int sum = 0;
    for (int acc = 0; acc < (1 << n); acc++) {
        // cout << "DP " << acc << ": " << dp[acc] << endl;
        if (acc == (1 << n) - 1)
            for (auto front : dp[acc]) {
                sum += front.second;
                sum %= MOD;
            }
        for (auto mp : mem[acc]) {
            int front = mp.first.first;
            int incoming = mp.first.second;
            int cost = mp.second;
            dp[acc | incoming][incoming] += (dp[acc][front] + cost) % MOD;
            dp[acc | incoming][incoming] %= MOD;
        }
    }
    cout << sum << endl;
    return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 0 / 12
• Subtask 3: 0 / 23
• Subtask 4: 0 / 21
• Subtask 5: 0 / 37