Submission #287970

#	Time	Username	Problem	Language	Result	Execution time	Memory
287970		oolimry	Bigger segments (IZhO19_segments)	C++14	0 / 100	1 ms	512 KiB

segments

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define sz(x) (int) (x).size()
using namespace std;
typedef long long lint;
typedef pair<int,lint> ii;

int arr[500006];

struct node{
	ii val = ii(0,0);
	node *l = nullptr, *r = nullptr;
	
	node(lint S, lint E){
		val = ii(0,0);
	}
	
	void create(lint s, lint e){
		lint m = (s + e)/2;
		if(s == e) return;
		l = new node(s, m);
		r = new node(m+1, e);
	}
	
	void update(lint X, ii V, lint s, lint e){
		lint m = (s+e)/2;
		if(s == e) val = V;
		else{
			if(l == nullptr) create(s, e);
			
			if(X <= m) l->update(X, V, s, m);
			else r->update(X, V, m+1, e);
			
			val = max(l->val, r->val);
		}
	}
	
	ii query(lint S, lint E, lint s, lint e){
		lint m = (s+e)/2;
		if(S == s && e == E) return val;
		else{
			if(l == nullptr) create(s, e);
			
			if(E <= m) return l->query(S, E, s, m);
			else if(S >= m+1) return r->query(S, E, m+1, e);
			else return max(l->query(S, m, s, m), r->query(m+1, E, m+1, e));
		}
	}
} *root = new node(0, 1e14);

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0);
	
	int n; cin >> n;
	for(int i = 1;i <= n;i++) cin >> arr[i];
	lint prefix = 0;
	
	root->update(0, ii(0,0), 0, 1e14);
	
	lint prev = 0;
	
	for(int i = 1;i <= n;i++){
		prefix += arr[i];
		ii res = root->query(0, prefix, 0, 1e14);
		int most = res.first + 1;
		lint take = prefix - res.second;
		
		assert(take + prefix >= prev);
		prev = take + prefix;
		
		if(i == n) cout << most;
		root->update(take + prefix, ii(most, prefix), 0, 1e14);
	}
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27