oj.uz

Submission #888843

# Submission time Handle Problem Language Result Execution time Memory
888843 2023-12-18T09:16:43 Z thunopro Passport (JOI23_passport) C++14
46 / 100
 117 ms 101716 KB 
#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 n ; 
pii a [maxn] ; 

bool is_query [maxn] ;

void sub1 () 
{
	priority_queue <int> S ; 
	for ( int i = 1 ; i <= a [1].se ; i ++ ) S.push(a[i].se) ; 
	int res = 1 ; 
	int cur = a[1].se ; 
	while ( !S.empty () ) 
	{
		int u = S.top() ; S.pop() ; 
		if ( cur >= u ) break ; 
		while ( cur < u ) S . push (a[++cur].se) ; 
		res ++ ; 
	}
	if ( cur >= n ) cout << res ; 
	else cout << -1 ; 
} 

int dp [3009][3009] ; 
void sub2 () 
{
	int pos ; 
	for ( int i = 1 ; i <= n ; i ++ ) if ( is_query [i] ) pos = i ; 
	memset ( dp , 0x3f , sizeof dp ) ; 
	
	dp [pos][pos] = 0 ; 
	for ( int len = 0 ; len <= n-1 ; len ++ )
	{
		for ( int l = 1 ; l <= n ; l ++ ) 
		{
			int r = l + len ; 
			if ( r > n ) break ; 
			if ( dp [l][r] > 1e9 ) continue ; 
			for ( int i = l ; i <= r ; i ++ ) 
			{
				chkmin (dp[min(l,a[i].fi)][max(r,a[i].se)],dp[l][r]+1) ; 
			}
		}
	}

	if ( dp [1][n] > 1e9 ) dp [1][n] = - 1 ; 
	cout << dp [1][n] ; 
}

int range [3009][3009][2] ; 
void sub3 () 
{
	int pos ; 
	for ( int i = 1 ; i <= n ; i ++ ) if ( is_query [i] ) pos = i ; 
	memset ( dp , 0x3f , sizeof dp ) ; 
	dp [pos][pos] = 0 ; 
	
	deque <pii> q ; 
	q . push_back ({pos,pos}) ; 
	
	for ( int i = 1 ; i <= n ; i ++ ) for ( int j = i ; j <= n ; j ++ ) 
	{
		if ( i == j ) range [i][j][0] = INF , range [i][j][1] = - INF ; 
		
		if ( j > i ) range [i][j][0] = range [i][j-1][0] ; 
		chkmin (range[i][j][0],a[j].fi) ; 
		if ( j > i ) range [i][j][1] = range [i][j-1][1] ; 
		chkmax (range[i][j][1],a[j].se) ; 
	}
	
	while ( !q.empty() ) 
	{
		int l = q.front().fi , r = q.front().se ; 
		q.pop_front() ; 
		// state 1 : chosse left 
		int L = range [l][r][0] , R = r ; 
		if ( dp [L][R] > dp [l][r] + 1 ) q . push_back ({L,R}) , dp [L][R] = dp [l][r] + 1 ; 
		// state 2 : chosse right 
		L = l , R = range [l][r][1] ; 
		if ( dp [L][R] > dp [l][r] + 1 ) q . push_back ({L,R}) , dp [L][R] = dp [l][r] + 1 ; 
		// state 3 : in mid 
		if ( l == r ) 
		{
			L = a [l].fi , R = a[l].se ; 	
			if ( dp [L][R] > dp [l][r] + 1 ) q . push_back ({L,R}) , dp [L][R] = dp [l][r] + 1 ; 
		}
		else 
		{
			L = l + 1 , R = r ; 
			if ( dp [L][R] > dp [l][r]  ) q . push_front ({L,R}) , dp [L][R] = dp [l][r] ; 
			L = l , R = r - 1 ; 
			if ( dp [L][R] > dp [l][r]  ) q . push_front ({L,R}) , dp [L][R] = dp [l][r] ; 
		}
	}
	
	if ( dp [1][n] > INF ) dp [1][n] = - 1 ;
	cout << dp [1][n] ; 
}


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].fi >> a[i].se ; 
	
	int nq ; cin >> nq ; 
	for ( int i = 1 ; i <= nq ; i ++ ) 
	{
		int x ; cin >> x ; 
		is_query [x] = true ; 
	}
	
	if ( nq == 1 && is_query [1] == true ) sub1 () ; 
	else if ( nq == 1 && n <= 300 ) sub2 () ;
	else if ( nq == 1 && n <= 2500 ) sub3 () ;  
	else if ( n <= 2500 ) sub3 () ; 
}

Compilation message

passport.cpp: In function 'void rf()':
passport.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) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
passport.cpp: In function 'void sub2()':
passport.cpp:67:16: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   67 |  dp [pos][pos] = 0 ;
      |  ~~~~~~~~~~~~~~^~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 33 ms 4824 KB Output is correct
5 Correct 36 ms 4836 KB Output is correct
6 Correct 24 ms 3664 KB Output is correct
7 Correct 20 ms 4828 KB Output is correct
8 Correct 17 ms 3808 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 4 ms 37212 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 6 ms 37212 KB Output is correct
6 Correct 5 ms 37212 KB Output is correct
7 Correct 5 ms 37208 KB Output is correct
8 Correct 5 ms 37464 KB Output is correct
9 Correct 5 ms 37208 KB Output is correct
10 Correct 5 ms 37212 KB Output is correct
11 Correct 6 ms 37212 KB Output is correct
12 Correct 6 ms 37208 KB Output is correct
13 Correct 5 ms 37464 KB Output is correct
14 Correct 5 ms 37212 KB Output is correct
15 Correct 7 ms 37352 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 4 ms 37212 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 6 ms 37212 KB Output is correct
6 Correct 5 ms 37212 KB Output is correct
7 Correct 5 ms 37208 KB Output is correct
8 Correct 5 ms 37464 KB Output is correct
9 Correct 5 ms 37208 KB Output is correct
10 Correct 5 ms 37212 KB Output is correct
11 Correct 6 ms 37212 KB Output is correct
12 Correct 6 ms 37208 KB Output is correct
13 Correct 5 ms 37464 KB Output is correct
14 Correct 5 ms 37212 KB Output is correct
15 Correct 7 ms 37352 KB Output is correct
16 Correct 104 ms 93008 KB Output is correct
17 Correct 71 ms 97120 KB Output is correct
18 Correct 91 ms 97428 KB Output is correct
19 Correct 94 ms 95820 KB Output is correct
20 Correct 53 ms 97064 KB Output is correct
21 Correct 58 ms 96848 KB Output is correct
22 Correct 40 ms 97232 KB Output is correct
23 Correct 117 ms 101716 KB Output is correct
24 Correct 106 ms 97112 KB Output is correct

Subtask #4
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 4 ms 37212 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 6 ms 37212 KB Output is correct
6 Correct 5 ms 37212 KB Output is correct
7 Correct 5 ms 37208 KB Output is correct
8 Correct 5 ms 37464 KB Output is correct
9 Correct 5 ms 37208 KB Output is correct
10 Correct 5 ms 37212 KB Output is correct
11 Correct 6 ms 37212 KB Output is correct
12 Correct 6 ms 37208 KB Output is correct
13 Correct 5 ms 37464 KB Output is correct
14 Correct 5 ms 37212 KB Output is correct
15 Correct 7 ms 37352 KB Output is correct
16 Correct 104 ms 93008 KB Output is correct
17 Correct 71 ms 97120 KB Output is correct
18 Correct 91 ms 97428 KB Output is correct
19 Correct 94 ms 95820 KB Output is correct
20 Correct 53 ms 97064 KB Output is correct
21 Correct 58 ms 96848 KB Output is correct
22 Correct 40 ms 97232 KB Output is correct
23 Correct 117 ms 101716 KB Output is correct
24 Correct 106 ms 97112 KB Output is correct
25 Incorrect 5 ms 37212 KB Output isn't correct
26 Halted 0 ms 0 KB -

Subtask #5
0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 33 ms 4824 KB Output is correct
5 Correct 36 ms 4836 KB Output is correct
6 Correct 24 ms 3664 KB Output is correct
7 Correct 20 ms 4828 KB Output is correct
8 Correct 17 ms 3808 KB Output is correct
9 Correct 0 ms 2396 KB Output is correct
10 Correct 4 ms 37212 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 0 ms 2396 KB Output is correct
13 Correct 6 ms 37212 KB Output is correct
14 Correct 5 ms 37212 KB Output is correct
15 Correct 5 ms 37208 KB Output is correct
16 Correct 5 ms 37464 KB Output is correct
17 Correct 5 ms 37208 KB Output is correct
18 Correct 5 ms 37212 KB Output is correct
19 Correct 6 ms 37212 KB Output is correct
20 Correct 6 ms 37208 KB Output is correct
21 Correct 5 ms 37464 KB Output is correct
22 Correct 5 ms 37212 KB Output is correct
23 Correct 7 ms 37352 KB Output is correct
24 Correct 104 ms 93008 KB Output is correct
25 Correct 71 ms 97120 KB Output is correct
26 Correct 91 ms 97428 KB Output is correct
27 Correct 94 ms 95820 KB Output is correct
28 Correct 53 ms 97064 KB Output is correct
29 Correct 58 ms 96848 KB Output is correct
30 Correct 40 ms 97232 KB Output is correct
31 Correct 117 ms 101716 KB Output is correct
32 Correct 106 ms 97112 KB Output is correct
33 Incorrect 5 ms 37212 KB Output isn't correct
34 Halted 0 ms 0 KB -