Submission #846842

#	Time	Username	Problem	Language	Result	Execution time	Memory
846842		Abito	Financial Report (JOI21_financial)	C++17	40 / 100	229 ms	292180 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 y1 YONE
typedef unsigned long long ull;
using namespace std;
const int N=3e5+5,M=405;
int a[N],n,d,bit[N],lis[N],b[N],dp[M][M][M];
bool vis[M][M][M];
void edit(int x){
    while (x<=n){
        bit[x]++;
        x+=x&-x;
    }return;
}int query(int x){
    int y=0;
    while (x){
        y+=bit[x];
        x-=x&-x;
    }return y;
}
int rec(int i,int last,int mx){
    if (i-last>d && last) return INT_MIN;
    if (i>n && last!=n) return INT_MIN;
    if (i>n) return 0;
    if (vis[i][last][mx]) return dp[i][last][mx];
    vis[i][last][mx]=true;
    int nextmx=mx;
    if (a[i]>a[mx]) nextmx=i;
    return dp[i][last][mx]=max(rec(i+1,last,mx),rec(i+1,i,nextmx)+bool(nextmx==i));
}
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>n>>d;
    for (int i=1;i<=n;i++) cin>>a[i];
    a[0]=INT_MIN;
    if (d==1){
        stack<int> s;
        for (int i=1;i<=n;i++){
            while (!s.empty()){
                if (a[s.top()]<a[i]) s.pop();
                else{
                    b[i]=s.top();
                    break;
                }
            }s.push(i);
        }
        int ans=0;
        for (int i=n;i;i--){
            edit(b[i]+1);
            ans=max(ans,query(i));
        }cout<<ans<<endl;
        return 0;
    }cout<<rec(1,0,0)<<endl;
    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 0 / 20
• Subtask 4: 12 / 12
• Subtask 5: 0 / 5
• Subtask 6: 0 / 35