Submission #372418

#	Time	Username	Problem	Language	Result	Execution time	Memory
372418		arwaeystoamneg	Boxes with souvenirs (IOI15_boxes)	C++17	70 / 100	2099 ms	313444 KiB

boxes

#include "boxes.h"

/*
ID: awesome35
LANG: C++14
TASK: vans
*/
#define _CRT_SECURE_NO_WARNINGS
#include<bits/stdc++.h>
#include<unordered_set>
#include<unordered_map>
#include<chrono>

using namespace std;
typedef pair<int, int> pii;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pair<int, int>> vpi;
typedef vector<pair<ll, ll>> vpll;

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define pb push_back
#define mp make_pair
#define rsz resize
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define f first
#define s second
#define cont continue
#define endl '\n'
#define ednl '\n'
#define test int testc;cin>>testc;while(testc--)
#define pr(a, b) trav(x,a)cerr << x << b; cerr << endl;
#define message cout << "Hello World" << endl;
//const int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 }; // for every grid problem!!
const ll linf = 4000000000000000000LL;
const ll inf = 1000000007;//998244353
const ld pi = 3.1415926535;

void pv(vi a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vll a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vector<vi>a) {
	F0R(i, sz(a)) { cout << i << endl; pv(a[i]); cout << endl; }
}void pv(vector<vll>a) { F0R(i, sz(a)) { cout << i << endl; pv(a[i]); }cout << endl; }void pv(vector<string>a) { trav(x, a)cout << x << endl; cout << endl; }
void setIO(string s) {
	ios_base::sync_with_stdio(0); cin.tie(0);
	if (sz(s))
	{
		freopen((s + ".in").c_str(), "r", stdin);
		if (s != "ioi")
			freopen((s + ".out").c_str(), "w", stdout);
	}
}
const int MAX = 100;
int n, k, L;
vi a;
ll sub1()
{
	ll ans = 0;
	trav(x, a)
	{
		ans += min(x, L - x);
	}
	ans *= 2;
	return ans;
}
ll sub2()
{
	int ans = inf;
	ans = L;
	ans = min(ans, 2 * a[n - 1]);
	ans = min(ans, 2 * (L - a[0]));
	F0R(i, n - 1)
	{
		ans = min(ans, 2 * (a[i] + L - a[i + 1]));
	}
	return ans;
}
int popcount(int a)
{
	int count = 0;
	while (a)
	{
		count += (a & 1);
		a >>= 1;
	}
	return count;
}
ll sub3()
{
	int total = 1 << n;
	vll dp(total, linf);
	dp[0] = 0;
	F0R(mask, total)
	{
		if (dp[mask] == linf)continue;
		F0R(nmask, total)
		{
			if (popcount(nmask) > k || popcount(nmask) == 0)continue;
			if (mask & nmask)continue;
			int cost = L;
			vi b;
			F0R(i, n)if (nmask & (1 << i))b.pb(a[i]);
			cost = min(cost, 2 * b[sz(b) - 1]);
			cost = min(cost, 2 * (L - b[0]));
			F0R(i, sz(b) - 1)
			{
				cost = min(cost, 2 * (b[i] + L - b[i + 1]));
			}
			dp[mask | nmask] = min(dp[mask | nmask], dp[mask] + cost);
		}
	}
	return dp[total - 1];
}
ll sub4()
{
	vll dp(n + 1, linf);
	dp[0] = 0;
	F0R(i, n)
	{
		FOR(j, 1, k + 1)
		{
			if (i + j > n)break;
			int cost = L;
			cost = min(cost, 2 * a[i + j - 1]);
			cost = min(cost, 2 * (L - a[i]));
			dp[i + j] = min(dp[i + j], dp[i] + cost);
		}
	}
	return dp[n];
}
ll sub56()
{
	vll dp(n + 1, linf);
	dp[0] = 0;
	multiset<ll>val1, val2;// stores min 2 * L + dp[i] - 2 * a[i] and stores min dp[i]. remeber to + min(L, 2 * a[i - 1])
	val1.insert(2 * (L - a[0]));
	val2.insert(0);
	FOR(i, 1, n + 1)
	{
		/*
		FOR(j, i - k, i)
		{
			if (j < 0)continue;
			dp[i] = min({ dp[i], dp[j] + 2 * (L - a[j]), dp[j] + min(L, 2 * a[i - 1]) });
		}*/
		dp[i] = min(*val1.begin(), *val2.begin() + min(L, 2 * a[i - 1]));
		if (i >= k)
		{
			val1.erase(val1.find(dp[i - k] + 2 * (L - a[i - k])));
			val2.erase(val2.find(dp[i - k]));
		}
		if (i < n)
		{
			val1.insert(dp[i] + 2 * (L - a[i]));
			val2.insert(dp[i]);
		}
	}
	return dp[n];
}
ll delivery(int A, int b, int c, int* d)
{
	n = A, k = b, L = c;
	a.rsz(n);
	F0R(i, n)a[i] = d[i];
	if (n <= 1000)
	{/*
		
			if (k == 1)
			{
				return sub1();
			}
			else if (k == n)
			{
				return sub2();
			}
			else if (n <= 10)
			{
				return sub3();
			}
		return sub56();*/
	}
	return sub56();
}

Compilation message (stderr)

boxes.cpp: In function 'int popcount(int)':
boxes.cpp:85:19: warning: declaration of 'a' shadows a global declaration [-Wshadow]
   85 | int popcount(int a)
      |                   ^
boxes.cpp:62:4: note: shadowed declaration is here
   62 | vi a;
      |    ^
boxes.cpp: In function 'void setIO(std::string)':
boxes.cpp:55:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   55 |   freopen((s + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
boxes.cpp:57:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   57 |    freopen((s + ".out").c_str(), "w", stdout);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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