Submission #160782

#	Time	Username	Problem	Language	Result	Execution time	Memory
160782		sofhiasouza	Cover (COCI18_cover)	C++14	96 / 120	12 ms	636 KiB

cover

#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define F first
#define S second
using namespace std;
typedef pair < int, int > ii;

const int maxn = 5e3+10, inf = 1e18;

int n, dp[maxn];

map < int, int > mapa;

int32_t main()
{
	cin >> n;

	for(int i = 1 ; i <= n ; i++)
	{
		int x, y;
		cin >> x >> y;
	
		x = abs(x+x);
		y = abs(y+y);

		mapa[x] = max(mapa[x], y);
	}

	vector < ii > aux;

	for(auto v : mapa)
	{
		if(!aux.size() or aux[aux.size()-1].S > v.S) aux.pb(v);
		else if(aux.size())
		{
			aux.pop_back();
			aux.pb(v);
		}
	}

	//reverse(aux.begin(), aux.end());

	/*for(int i = 0 ; i < aux.size() ; i++)
	{
		cout << aux[i].F << ' ' << aux[i].S << "\n";
	}*/

	dp[1] = 0;

	for(int i = 1 ; i < aux.size() ; i++)
	{
		dp[i+1] = inf;
	
		for(int j = 0 ; j < i ; j++)
		{
			dp[i+1] = min(dp[i+1], dp[j+1] + aux[j].S*aux[i-1].F);
		}
	}

	int resp = inf;
	for(int i = 0 ; i < aux.size() ; i++)
	{
		resp = min(resp, dp[i+1] + aux[i].S*aux[aux.size()-1].F);
	}

	cout << resp << "\n";	
}

Compilation message (stderr)

cover.cpp: In function 'int32_t main()':
cover.cpp:51:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 1 ; i < aux.size() ; i++)
                  ~~^~~~~~~~~~~~
cover.cpp:62:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0 ; i < aux.size() ; i++)
                  ~~^~~~~~~~~~~~

• Subtask 1: 96 / 120