oj.uz

답안 #306566

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
306566 2020-09-25T20:50:51 Z CaroLinda Mountains (IOI17_mountains) C++14
0 / 100
 1 ms 256 KB 
#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) , maxSuf(n+5,0) ;

	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-1 ; i >= 0 ; i-- ) maxSuf[i] = max(maxSuf[i+1] , dp[i][r-1] ) ;

		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] += maxSuf[ meuUltimo[i]+1 ] ;

				maxSuf[i] = max(maxSuf[i] ,dp[i][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 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Incorrect 1 ms 256 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Incorrect 1 ms 256 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Incorrect 1 ms 256 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Incorrect 1 ms 256 KB Output isn't correct
4 Halted 0 ms 0 KB -