Submission #306563

#	Time	Username	Problem	Language	Result	Execution time	Memory
306563		CaroLinda	Mountains (IOI17_mountains)	C++14	0 / 100	1 ms	256 KiB

mountains

#include "mountains.h"
#include <bits/stdc++.h>

#define ll long long
#define sz(x) (int)(x.size())

using namespace std ;

template<class T>
class Point
{
	public:
		
		T x , y ;

		Point(){ x = y = 0 ; }

		Point(T a, T b)
		{
			x = a ;
			y = b ;
		}

		T operator % (Point other) const { return x*other.y - y*other.x ; }
		T operator * (Point other) const { return x*other.x + y*other.y ; }
		Point operator - (Point other) const { return Point(x-other.x, y-other.y) ; }

} ;

int maximum_deevs(vector<int> y) 
{

	int n = sz(y) ;

	vector< Point<ll> > ponto(n) ;

	for(int i = 0 ; i< n ; i++ ) ponto[i].x = i , ponto[i].y = y[i] ;

	vector< vector<int> > dp(n+5, vector<int>(n+5,0) ) ;
	vector< int > meuUltimo(n) ;

	for(int i = 0 ; i < n ; i++ )
		for(int j = i ; j < n ; j++ ) dp[i][j] = 1 ;
	for(int i = 0 ; i <n-1 ; i++ ) meuUltimo[i] = i+1 ;

	for(int r = 2 ; r <= n ; r++ )
	{
		for(int i = 0 ; i <= r-2 ; i++ )
			dp[i][r-1] = dp[i][r-2] ;

		for(int i = r-2 ; i >= 0 ; i-- )
			if( i == n || (ponto[meuUltimo[i]] - ponto[i]) % (ponto[r]-ponto[i]) >= 0  )
			{
				if(meuUltimo[i] + 1 <= r-1 ) 
					dp[i][r-1] += dp[ meuUltimo[i]+1 ][r-1] ;
				
				meuUltimo[i] = r ;
			}
	}

	int mx = 1 ;

	for(int i = 0 ; i < n ; i++ ) mx = max(mx, *max_element(dp[i].begin() , dp[i].end())) ;

	return mx ;

}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30