Submission #908099

#	Time	Username	Problem	Language	Result	Execution time	Memory
908099		arashMLG	Triple Jump (JOI19_jumps)	C++17	0 / 100	2088 ms	9808 KiB

jumps

#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll>   pll;

const int N = 2e5 + 23;
const ll inf = 1e18;

#define F                  first
#define S                  second
#define pb	               push_back
#define sz(x)              ((int)x.size())
#define kill(x)            cout<<x , exit(0);
#define all(x)             x.begin(),x.end()
#define lc                 (v<<1)
#define rc                 ((v<<1)|1)
#define debug(x)           cerr<< #x << " : " << x << '\n';
#define int                ll

struct Seg {
	int t[N<<2];
	
	Seg() {
		fill(t,t+(N<<2),0);
	}

	void upd(int pos,int x,int v=1,int tl=1,int tr= N) {
		if(tr-tl==1) {
			t[v] = max(t[v],x);
			return;
		}	
		int mid=(tl+tr)/2;
		if(pos<mid)
			upd(pos,x,lc,tl,mid);
		else
			upd(pos,x,rc,mid,tr);
		t[v] = max(t[lc],t[rc]);
	}
	
	int get(int l,int r,int v=1,int tl=1,int tr= N) {
		if(l > r) return 0;
		if(l == tl && r == tr-1) return t[v];
		int mid=(tl + tr)/2;
		return max(get(l,min(mid-1,r),lc,tl,mid) , get(max(l,mid),r,rc,mid,tr));
	}
}seg;

int n,q;
int a[N];
vector<int> ord;

int get(int x,int y) {
	if(x > y)swap(x,y);
	if(x == y) return 0;
	int ans =0;
	if(y-x != 1) {
		ans = max(ans,a[x] + a[y] + seg.get(x+1,(x+y)/2));
	}
	if(y + (y-x) <= n){ 
		ans = max(ans, a[x] + a[y] + seg.get(y+y-x, n));
	}
	int sex = max(x-(y-x),1LL);
	ans = max(ans,a[x] + a[y] + seg.get(sex,x-1));
	return ans;
}

int32_t main() {
	cin>>n;
	for(int i = 1; i<= n ; i ++) {
		cin>>a[i];
		seg.upd(i,a[i]);
	}
	ord.resize(n);
	iota(all(ord),1);
	sort(all(ord), [&] (int x,int y) { return a[x] > a[y]; });
	vector<int> sex;
	int I = 0;
	while(sz(sex) < min(n,2000LL)) {
		sex.pb(ord[I++]);
	}
	int ans=0;
	for(int x : sex) for(int y : sex) ans= max(ans,get(x,y));
	cout<<ans << '\n';
	return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 27
• Subtask 4: 0 / 54