Submission #783825

#	Time	Username	Problem	Language	Result	Execution time	Memory
783825		makanhulia	Furniture (JOI20_furniture)	C++17	0 / 100	1 ms	212 KiB

furniture

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,a[300005],dp[300005],suff[300005];
// bool kondisi[300005];
ll mod=1000000007;
int main(){
    a[0]=1e9;
    cin>>n;
    for (int i=1;i<=n;i++){
        cin>>a[i];
    }
    dp[0]=1;
    for (int i=1;i<=n;i++){
        for (int j=0;j<i;j++){
            ll u=min(a[j],a[i]);
            ll kondisi=0;
            for (int k=j+1;k<i;k++){
                if (a[k]<u) kondisi=1;
            }
            if (kondisi==0) {
                dp[i]+=dp[j];
                dp[i]=dp[i]%mod;
            }
        }
    }
    suff[n]=a[n];
    for (int i=n-1;i>=1;i--){
        suff[i]=min(suff[i+1],a[i]);
    }
    ll ans=0;
    for (int i=1;i<=n;i++){
        if (suff[i]==a[i]) ans+=dp[i];
        ans=ans%mod;
    }
    cout<<ans;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95