Submission #997555

#	Time	Username	Problem	Language	Result	Execution time	Memory
997555		Abito	Festivals in JOI Kingdom 2 (JOI23_festival2)	C++17	10 / 100	9026 ms	600 KiB

festival2

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
#define int long long
#define ll long long
#define y1 YONE
typedef unsigned long long ull;
using namespace std;
const int N=20;
int n,P;
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>n>>P;int ans=0;
    for (int mask=0;mask<(1<<(2*n));mask++){
        if (__builtin_popcount(mask)!=n) continue;
        vector<int> a,b;
        for (int j=1;j<=2*n;j++){
            if (mask&(1<<(j-1))) a.pb(j);
            else b.pb(j);
        }
        do{
            bool ok=true;
            for (int i=0;i<n;i++) ok&=(a[i]<b[i]);
            if (!ok) continue;
            int ans1=0,r=0;
            for (int i=0;i<n;i++){
                if (a[i]>r){
                    ans1++;
                    r=b[i];
                }
            }
            int ans2=0;r=0;
            while (true){
                bool f=0;
                int idx=-1;
                for (int i=0;i<n;i++){
                    if (a[i]<r) continue;
                    if (-1==idx ||  b[i]<b[idx]){
                        idx=i;
                        f=1;
                    }
                }
                if (!f) break;
                ans2++;
                r=b[idx];
        }ans+=(ans2>ans1);
        }while(next_permutation(b.begin(),b.end()));
    }cout<<ans%P<<endl;
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 27
• Subtask 4: 0 / 14
• Subtask 5: 0 / 36
• Subtask 6: 0 / 13