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Submission #572691

# Submission time Handle Problem Language Result Execution time Memory
572691 2022-06-05T04:52:15 Z piOOE Amusement Park (CEOI19_amusementpark) C++17
0 / 100
 1 ms 340 KB 
#include <bits/stdc++.h>

using namespace std;

#define sz(x) ((int)size(x))
#define all(x) begin(x), end(x)
#define trace(x) cout << #x << ": " << (x) << endl;

typedef long long ll;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

int rand(int l, int r) { return (int) ((ll) rnd() % (r - l + 1)) + l; }

const int N = 18, mod = 998244353;

int sum[1 << N], dp[1 << N];

vector<int> g[N], rg[N];
bool used[N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < m; ++i) {
        int a, b;
        cin >> a >> b;
        --a, --b;
        g[a].push_back(b);
        rg[b].push_back(a);
    }
    for (int mask = 1; mask < (1 << n); ++mask) {
        vector<int> now;
        memset(used, 0, sizeof(used));
        for (int i = 0; i < n; ++i) {
            if (mask & 1 << i) {
                used[i] = true;
                now.push_back(i);
            }
        }
        if (sz(now) == 1) {
            dp[mask] = 1;
            sum[mask] = 0;
        } else {
            for (int i : now) {
                int msk = mask ^ (1 << i);
                int cnt = 0;
                for (int to : rg[i]) {
                    if (used[to]) {
                        ++cnt;
                    }
                }
                dp[mask] = (dp[mask] + dp[msk]) % mod;
                sum[mask] = (sum[mask] + sum[msk] + dp[msk] * (ll)cnt) % mod;
            }
        }
    }
    cout << sum[(1 << n) - 1];
    return 0;
}

Subtask #1
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Incorrect 1 ms 340 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Incorrect 1 ms 340 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Incorrect 1 ms 340 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Incorrect 1 ms 340 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Incorrect 1 ms 340 KB Output isn't correct
4 Halted 0 ms 0 KB -