Submission #891233

#	Time	Username	Problem	Language	Result	Execution time	Memory
891233		thunopro	Sightseeing in Kyoto (JOI22_kyoto)	C++14	40 / 100	577 ms	76368 KiB

kyoto

#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 ; 
const int LOG = 18 ; 

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

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

void rf () 
{
	freopen ("bai1.inp","r",stdin) ; 
//	freopen ("bai1.out","w",stdout) ; 
}

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 ; 
}

int n , m ; 
int a [maxn] , b [maxn] ; 

ll dp [2009][2009] ;

void sub1 () 
{
	memset ( dp , 0x3f , sizeof dp ) ; 
	dp [1][1] = 0 ; 
	for ( int i = 1 ; i <= n ; i ++ ) for ( int j = 1 ; j <= m ; j ++ ) 
	{
		if ( i == 1 && j == 1 ) continue ; 
		if ( j > 1 ) chkmin (dp[i][j],dp[i][j-1]+a[i]) ; 
		if ( i > 1 ) chkmin (dp[i][j],dp[i-1][j]+b[j]) ; 
	}
	cout << dp [n][m] ; 
}

int row [maxn] , col [maxn] ; 
int lef [maxn] , rig [maxn] ; 
bool used [maxn] ; 

void sub2 () 
{	
	memset ( lef , 0x3f , sizeof lef ) ; 
	memset ( rig , 0x3f , sizeof rig ) ; 
	memset ( used , false , sizeof used ) ; 
	int num_r = 0 ; 
	
	for ( int i = 1 ; i <= n ; i ++ ) lef [i] = lef [i-1] , chkmin (lef[i],a[i]) ; 
	for ( int i = n ; i >= 1 ; i -- ) rig [i] = rig [i+1] , chkmin (rig[i],a[i]) ;
	
	for ( int i = 2 ; i < n ; i ++ ) if ( a [i] >= lef [i-1] && a [i] >= rig [i+1] ) used [i] = true ; 
	
	for ( int i = 1 ; i <= n ; i ++ ) 
	{
		if ( used [i] == false ) row [++num_r] = i ; 
	}
	
	memset ( lef , 0x3f , sizeof lef ) ; 
	memset ( rig , 0x3f , sizeof rig ) ; 
	memset ( used , false , sizeof used ) ; 
	int num_c = 0 ; 
	
	for ( int i = 1 ; i <= m ; i ++ ) lef [i] = lef [i-1] , chkmin (lef[i],b[i]) ; 
	for ( int i = m ; i >= 1 ; i -- ) rig [i] = rig [i+1] , chkmin (rig[i],b[i]) ;
	
	for ( int i = 2 ; i < m ; i ++ ) if ( b [i] >= lef [i-1] && b [i] >= rig [i+1] ) used [i] = true ; 
	
	for ( int i = 1 ; i <= m ; i ++ ) 
	{
		if ( used [i] == false ) col [++num_c] = i ; 
	}
	
	memset ( dp , 0x3f , sizeof dp ) ; 
	dp [1][1] = 0 ; 
	
	for ( int i = 1 ; i <= num_r ; i ++ ) 
	{
		for ( int j = 1 ; j <= num_c ; j ++ ) 
		{
			if ( i == 1 && j == 1 ) continue ; 
			if ( j > 1 ) chkmin (dp[i][j],dp[i][j-1]+1ll*(col[j]-col[j-1])*a[row[i]]) ;
			if ( i > 1 ) chkmin (dp[i][j],dp[i-1][j]+1ll*(row[i]-row[i-1])*b[col[j]]) ; 
		}
	}
	
	cout << dp [num_r][num_c] ; 
}

int main () 
{
	ios_base::sync_with_stdio(0) ; 
	cin.tie(0) ; cout.tie(0) ; 
//	rf () ; 
	cin >> n >> m ; 
	for ( int i = 1 ; i <= n ; i ++ ) cin >> a [i] ; 
	for ( int i = 1 ; i <= m ; i ++ ) cin >> b [i] ; 
	
	if ( n <= 1000 && m <= 1000 ) sub1 () ;
	else sub2 () ;  
}

Compilation message (stderr)

kyoto.cpp: In function 'void rf()':
kyoto.cpp:34:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  freopen ("bai1.inp","r",stdin) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 30 / 30
• Subtask 3: 0 / 60