Submission #846916

#	Time	Username	Problem	Language	Result	Execution time	Memory
846916		Abito	Financial Report (JOI21_financial)	C++17	65 / 100	4035 ms	21584 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;
int a[N],n,d,bit[N],seg[4*N+5],b[N],dp[N];
void upd(int x){
    while (x<=n){
        bit[x]++;
        x+=x&-x;
    }return;
}int calc(int x){
    int y=0;
    while (x){
        y+=bit[x];
        x-=x&-x;
    }return y;
}
int edit(int node,int l,int r,int idx,int val){
    if (l==r) return seg[node]=val;
    int mid=(l+r)/2;
    if (idx<=mid) return seg[node]=max(edit(node*2,l,mid,idx,val),seg[node*2+1]);
    return seg[node]=max(edit(node*2+1,mid+1,r,idx,val),seg[node*2]);
}
int query(int node,int l,int r,int lx,int rx){
    if (r<lx || l>rx) return 0;
    if (l>=lx && r<=rx) return seg[node];
    int mid=(l+r)/2;
    return max(query(node*2,l,mid,lx,rx),query(node*2+1,mid+1,r,lx,rx));
}
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--){
            upd(b[i]+1);
            ans=max(ans,calc(i));
        }cout<<ans<<endl;
        return 0;
    }
    if (d==n){
        map<int,int> mp;mp[INT_MIN]++;
        for (int i=1;i<=n;i++) mp[a[i]]++;
        int c=0;
        for (auto u:mp) mp[u.F]=c++;
        for (int i=1;i<=n;i++){
            a[i]=mp[a[i]];
            edit(1,1,n,a[i],query(1,1,n,0,a[i]-1)+1);
        }cout<<query(1,1,n,0,4*N+4)<<endl;
        return 0;
    }int ans=0;
    for (int i=1;i<=n;i++){
        dp[i]=1;
        int x=i;
        for (int j=i-1;j;j--){
            if (x-j>d) break;
            if (a[j]>=a[i]) continue;
            dp[i]=max(dp[i],dp[j]+1);
            x=j;
        }ans=max(ans,dp[i]);
    }cout<<ans<<endl;
    return 0;
}

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