Submission #118361

#	Time	Username	Problem	Language	Result	Execution time	Memory
118361		JustasZ	Boxes with souvenirs (IOI15_boxes)	C++14	10 / 100	2 ms	404 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<int>a, b;
	for(int i = 0; i < n; i++)
	{
		if(pos[i] <= l - pos[i])
			a.pb(pos[i]);
		else
			b.pb(pos[i]);
	}
	sort(all(a));
	sort(all(b), greater<int>());
	int it = 0;
	ll ans = 0;
	while(it + k - 1 < sz(a))
	{
		ans += a[it + k - 1];
		it += k;
	}
	int it2 = 0;
	while(it2 + k - 1 < sz(b))
	{
		ans += l - b[it2 + k - 1];
		it2 += k;
	}
	ans *= 2;
	if(it == sz(a) && it2 != sz(b))
		ans += 2 * (l - b.back());
	else if(it2 == sz(b) && it != sz(a))
		ans += 2 * (l - a.back());
	else if(it != sz(a) && it2 != sz(b))
	{
		ll add = 1e18;
		vector<ll>c;
		for(int i = 0; i < sz(a); i++)
			c.pb(a[i]);
		for(int i = sz(b) - 1; i >= 0; i--)
			c.pb(b[i]);
		for(int i = 0; i < sz(c) - 1; i++)
			add = min(add, (c[i] + l - c[i + 1]) + min(c[i], l - c[i]) + min(c[i + 1], l - c[i + 1]));
		if(sz(c) <= k)
		{
			add = min(add, 2 * min(min(c[0], l - c[0]), min(c.back(), l - c.back())));
			add = min(add, 1ll * l);
		}
		else
			add = min(add, 2ll * l);
		ans += add;
	}
	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