Submission #1031329

#	Time	Username	Problem	Language	Result	Execution time	Memory
1031329		Abito	Flooding Wall (BOI24_wall)	C++17	25 / 100	5059 ms	21840 KiB

Main

#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=5e5+5,M=1e9+7;
int a[N],n,b[N],p[N],c[2*N];
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    p[0]=1;
    for (int i=1;i<N;i++) p[i]=p[i-1]*2%M;
    cin>>n;
    for (int i=1;i<=n;i++) cin>>a[i],c[i]=a[i];
    for (int i=1;i<=n;i++) cin>>b[i],c[i+n]=b[i];
    sort(c+1,c+1+2*n);
    int ans=0;
    for (int i=1;i<=n;i++){
        for (int j=1;j<=2*n;j++){
            if (c[j]==c[j-1]) continue;
            int l=1,r=1;
            for (int k=1;k<i;k++){
                int x=(a[k]<c[j])+(b[k]<c[j]);
                l=l*x%M;
            }
            l=(p[i-1]-l+M)%M;
            for (int k=i+1;k<=n;k++){
                int x=(a[k]<c[j])+(b[k]<c[j]);
                r=r*x%M;
            }
            r=(p[n-i]-r+M)%M;
            //cout<<i<<' '<<c[j]<<' '<<l<<' '<<r<<endl;
            l=l*r%M;
            if (a[i]<c[j]) ans=(ans+(l*(c[j]-c[j-1])%M))%M;
            if (b[i]<c[j]) ans=(ans+(l*(c[j]-c[j-1])%M))%M;
        }
    }
    cout<<ans<<endl;
    return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 17 / 17
• Subtask 3: 0 / 19
• Subtask 4: 0 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 30