Submission #118395

#	Time	Username	Problem	Language	Result	Execution time	Memory
118395		JustasZ	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	866 ms	333396 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 p[])
{
	sort(p, p + n);
	vector<int>pos;
	for(int i = 0; i < n; i++)
		if(p[i] != 0) pos.pb(p[i]);
	n = sz(pos);
	vector<ll>pref(n + 1, 0), suf(n + 1, 0);
	for(int i = 1; i <= n; i++)
	{
		pref[i] = pos[i - 1] + min(pos[i - 1], l - pos[i - 1]);
		if(i - k >= 1)
			pref[i] += pref[i - k];
	}
	for(int i = n; i >= 1; i--)
	{
		suf[i] = (l - pos[i - 1]) + min(pos[i - 1], l - pos[i - 1]);
		if(i + k <= n)
			suf[i] += suf[i + k];
	}
	ll ans = 1e18;
	for(int i = 1; i < n; i++)
	{
		ans = min(ans, pref[i] + suf[i + 1]);
		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: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30