Submission #922678

#	Time	Username	Problem	Language	Result	Execution time	Memory
922678		thunopro	Skyline (IZhO11_skyline)	C++14	100 / 100	113 ms	58684 KiB

skyline

#include<bits/stdc++.h>
using namespace std ; 
#define maxn 200009 
#define ll long long 
#define fi first 
#define se second 
#define pb push_back 
#define left id<<1
#define right id<<1|1 
#define re exit(0); 

const int mod = 1e9+7; 
const int INF = 1e9; 

typedef vector<int> vi; 
typedef pair<int,int> pii;
typedef vector<pii> vii;  
typedef vector<ll> vl;

void add ( int &a , int b ) 
{
	a += b ; 
	if ( a > mod ) a -= mod ; 
	if ( a < 0 ) a += mod ; 
}

template <typename T> void chkmin ( T &a , T b ) { if ( a > b ) a = b ; }
template <typename T> void chkmax ( T &a , T b ) { if ( a < b ) a = b ; }

int _pow ( int a , int n ) 
{
	if ( n == 0 ) return 1 ;
	int res = _pow (a,n/2) ; 
	if ( n % 2 ) return 1ll*res*res%mod*a%mod ; 
	else return 1ll*res*res%mod ; 
}

void rf () 
{
	freopen ("bai1.inp","r",stdin) ;
}

int n ; 
int a [maxn] ; 

int dp [309][209][209] ; 

int calc ( int pos , int h1 , int h2 ) 
{
	if ( pos == n+1 ) return 0 ; 
	int &res = dp [pos][h1][h2] ; 
	if ( res+1 ) return res ; 
	res = INF ; 
	if ( h1 ) 
	{
		res = min (res,calc(pos,h1-1,h2)+3) ; 
		if ( h2 ) 
		{
			res = min (res,calc(pos,h1-1,h2-1)+5) ; 
			if ( h1 <= min (h2,a[pos+2])) res = min (res,calc(pos+1,h2-h1,a[pos+2]-h1)+7*h1) ; 
		}
	}
	else res = min (res,calc(pos+1,h2,a[pos+2])) ; 
	return res ; 
}

int main () 
{
	ios_base::sync_with_stdio(0); 
	cin.tie(0);cout.tie(0); 
//	rf () ; 
	cin >> n ; 
	for ( int i = 1 ; i <= n ; i ++ ) cin >> a [i] ; 
	
	memset ( dp , -1 , sizeof dp ) ; 
	cout << calc (1,a[1],a[2]) ; 
	
}

Compilation message (stderr)

skyline.cpp: In function 'void rf()':
skyline.cpp:40:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |  freopen ("bai1.inp","r",stdin) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100