Submission #118386

#	Time	Username	Problem	Language	Result	Execution time	Memory
118386		JustasZ	Boxes with souvenirs (IOI15_boxes)	C++14	10 / 100	2 ms	412 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pb push_back
#define all(a) a.begin(), a.end()
#define sz(a) (int)a.size()
#define x first
#define y second
#define debug(...) cout << "[" << #__VA_ARGS__ << ": " << __VA_ARGS__ << "]\n"
#define rd() abs((int)rng())
using namespace std;
using namespace __gnu_pbds;
template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long ll;
typedef long double ld;
typedef pair<int, int>pii;
const int maxn = 1e5 + 100;
const int mod = 1e9 + 7;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll delivery(int n, int k, int l, int pos[])
{
	vector<ll>pref(n + 1, 0), suf(n + 1, 0);
	for(int i = 1; i <= n; i++)
	{
		pref[i] = pos[i - 1] * 2;
		if(i > k)
		{
			int j = i % k ? i - i % k : i - k;
			pref[i] += pref[j];
		}
	}
	for(int i = n; i >= 1; i--)
	{
		suf[i] = (l - pos[i - 1]) * 2;
		if(n - i + 1 > k)
		{
			int j = (n - i + 1) % k ? i + (n - i + 1) % k : i + k;
			suf[i] += suf[j];
		}
	}
	ll ans = 1e18;
	for(int i = 1; i <= n; i++)
	{
		ans = min(ans, pref[i] + suf[i + 1]);
		if(i + k <= n)
		{
			ll a = pref[i] + l;
			if(i + k + 1 <= n)
				a += suf[i + k + 1];
			ans = min(ans, a);
		}
	}
	ans = min(ans, pref[n]);
	ans = min(ans, suf[1]);
	return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30