Submission #1012986

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012986		Nurislam	Triple Jump (JOI19_jumps)	C++17	0 / 100	17 ms	7772 KiB

jumps

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define int long long

int n, q;
vector<pair<int,int> > qu;
int sp[22][10000];
int ans[5005][5005];
int get(int l, int r){
	int bt = __lg(r-l);
	return max(sp[bt][l], sp[bt][r-(1<<bt)+1]);
}

main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
	int n;
	cin >> n;
	for(int i = 1; i <= n; i++){
		int x;
		cin >> x;
		sp[0][i] = x;
	}
	
	cin >> q;
	for(int i = 0; i < q; i++){
		int l, r;
		cin >> l >> r;
		qu.pb({l, r});
	}
	
	for(int i = 1; i < 22; i++){
		int len = (1 << (i-1));
		for(int j = 1; j <= n; j++){
			sp[i][j] = max(sp[i-1][j], sp[i-1][min(n,j+len)]);
		}
	}
	if(n <= 5000){
		for(int i = 0; i <= n; i++){
			for(int j = 0; j <= n; j++){
				ans[i][j] = 0;
			}
		}
		for(int i = 1; i <= n; i++){
			for(int j = i+2; j <= n; j++){
				int mid = i + ((j-i) >> 1);
				ans[i][j] = sp[0][i] + sp[0][j] + get(i+1, mid);
				ans[i][j] = max(ans[i][j], ans[i][j-1]);
			}
		}
		for(int j = n; j > 0; j--){
			for(int i = j-1; i > 0; i--){
				ans[i][j] = max(ans[i][j], ans[i+1][j]);
			}
		}
		for(auto [l, r] :qu)cout << ans[l][r] << '\n';
	}
	
}
 
 
 
 
 
 
 
 
 
 
 
 
 

Compilation message (stderr)

jumps.cpp:19:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   19 | main(){
      | ^~~~

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