Submission #1279622

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279622		DanielPr8	Amusement Park (CEOI19_amusementpark)	C++20	7 / 100	1 ms	576 KiB

amusementpark

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvl = vector<vll>;
using pll = pair<ll,ll>;

#define f first
#define s second
#define pb push_back
#define all(v) v.begin(),v.end()
const int mod =  998244353;
int main(){
    ios_base::sync_with_stdio(0);cin.tie(NULL);
    ll n, m;
    cin >> n >> m;
    vvl g(n);
    vvl cn(n, vll(n));
    for(ll a,b,i = 0; i < m; ++i){
        cin >> a >> b;
        g[--a].pb(--b);
        cn[a][b]=cn[b][a]=1;
    }
    vll dp(1<<n);
    vvl mul(1<<n, vll(n));
    for(ll i = 1; i < (1<<n); ++i){
        for(ll j = 0; j < n; ++j){
            if(!(i & (1<<j)))continue;
            ll cnt=0;
            for(ll x:g[j])if(i&(1<<x))cnt++;
            ll p=0;
            if(__builtin_popcount(i)==1)p=1;
            for(ll k = 0; k < n; ++k){
                if(cn[k][j] || k<j)p+=mul[i^(1<<j)][k];
            }
            dp[i] += dp[i^(1<<j)]+cnt*p;
            dp[i]%=mod;
            mul[i][j] = p;
        }
    }
    cout << dp.back();
}

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