Submission #934131

#	Time	Username	Problem	Language	Result	Execution time	Memory
934131		sysia	Amusement Park (CEOI19_amusementpark)	C++17	0 / 100	0 ms	452 KiB

amusementpark

//Sylwia Sapkowska
#include <bits/stdc++.h>
#pragma GCC optimize("O3", "unroll-loops")
using namespace std;

void __print(int x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << "'" << x << "'";}
void __print(const char *x) {cerr << '"' << x << '"';}
void __print(const string &x) {cerr << '"' << x << '"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ", "; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? ", " : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef LOCAL
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

#define int long long
typedef pair<int, int> T;
const int oo = 1e18, oo2 = 1e9+7, K = 30;
const int mod = 998244353;

void add(int &a, int b){
    a += b;
    if (a >= mod) a-=mod;
}

int mul(int a, int b){
    return (a*b)%mod;
}

void solve(){
    int n, m; cin >> n >> m;
    vector g(n+1, vector<int>(n+1));
    while (m--){
        int a, b; cin >> a >> b;
        --a;--b;
        g[a][b]++;
    }
    vector<T>dp((1<<n));
    dp[0] = {1, 0};
    for (int mask = 1; mask<(1<<n); mask++){
        for (int i = 0; i<n; i++){
            if (mask&(1<<i)){
                int ile = 0;
                for (int j = 0; j<n; j++){
                    if (j == i) continue;
                    if (mask&(1<<j)){
                        ile += g[j][i];
                    }
                }
                add(dp[mask].second, dp[mask^(1<<i)].second);
                add(dp[mask].second, mul(dp[mask^(1<<i)].first, ile));
                add(dp[mask].first, dp[mask^(1<<i)].first);
            }
        }
        debug(mask, dp[mask]);
    }
    cout << dp[(1<<n)-1].second << "\n";
}

int32_t main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
    //cin >> t;
    while (t--) solve();

    return 0;
}

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