oj.uz

Submission #225755

# Submission time Handle Problem Language Result Execution time Memory
225755 2020-04-21T13:51:08 Z CaroLinda Building Skyscrapers (CEOI19_skyscrapers) C++14
8 / 100
 2396 ms 53588 KB 
#include <bits/stdc++.h>

#define debug printf
#define all(x) x.begin(),x.end()
#define lp(i,a,b) for(int i = a ; i< b ; i++)
#define ss second
#define ff first
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define mk make_pair

const int MAX = 1e6+10 ;
const int MAXN = 1e5+10 ;
const int inf = 1e9+10 ;

using namespace std ;

int N , T , idx ;
int X[MAXN] , Y[MAXN] , vet[MAXN] , pai[MAX] , pai_aux[MAXN] ;
int dx[8] = { 1,-1,0,0, 1,-1,1,-1 } , dy[8] = { 0,0,1,-1, -1,1, 1, -1} ;
int dx_cyclic[8] = { -1 , -1 , 0 , 1 , 1 ,1 , 0, -1 } , dy_cyclic[8] = { 0 , -1 , -1 , -1, 0 , 1 , 1 ,1  } ;
pii id[MAX] ;
bool is_full[MAX] , reachable[MAX] , marc[MAXN] ;
map< pii , int > mp ;
set<int> s ;
vector<int> ans ;
vector<int> componente[MAX] ;
set<int>::iterator it ;

// ------------------------------------------------

int get_code(int x, int y)
{

    if( mp.find( mk(x,y) ) == mp.end() ) return 0 ;
    return mp.find( mk(x,y) )->ss ;

}

int find(int x)
{
    if( x == pai[x] ) return x ;
    return pai[x] = find( pai[x] ) ;
}


bool identify_articulation(int name)
{
    int j = -1 ;
    vector<int> group ;

    for(int i = 0 , nx , ny ; i < 8 ; i ++ )
    {
        nx = X[name] + dx_cyclic[i] ;
        ny = Y[name] + dy_cyclic[i] ;

        if( is_full[ get_code(nx,ny) ] ) { j = i ; break ; }

    }

    if( j == -1 ) return false ;

    int beg = -1, en = beg , times = 0 ;

    for(int i = (j+1)%8 ; true ; i = (i+1)%8 )
    {

        if( i == ((j+1)%8) && times == 1 ) break ;
        else if( i == ((j+1)%8) && times == 0 ) times ++ ;

        int nx = X[name] + dx_cyclic[i] ;
        int ny = Y[name] + dy_cyclic[i] ;
        int c = get_code(nx,ny) ;

        if( is_full[c] )
        {

            if( beg == -1 ) continue ;
            if( beg % 2 == 1 && en == beg )  { beg = -1 ; continue ; }
            group.pb( find( get_code( X[name]+dx_cyclic[beg] , Y[name]+dy_cyclic[beg] ) ) ) ;
            beg = -1 ;
            continue ;
        }

        if( beg == -1 ) beg = en = i ;
        else en = i ;

    }

    sort(all(group) ) ;
    for(int i = 1 ; i < group.size() ; i++ )
        if( group[i] == group[i-1] ) return true ;

    return false ;

}

bool identify_infinity(int name)
{
    for(int i = 0 ,c ; i < 4 ; i++ )
    {

        c = get_code( dx[i] + X[name] , dy[i] + Y[name] ) ;
        c = find(c) ;
        if( reachable[c] ) return true ;

    }

    return false ;

}
bool check(int i) { return ( !identify_articulation(i) )&identify_infinity(i) ; }

inline void to_change(int name)
{

    for(int i = 0 ; i < 8 ; i++ )
    {

        int nx = X[name] + dx[i] ;
        int ny = Y[name] + dy[i] ;
        int c = get_code( nx, ny ) ;

        if( !is_full[c] ) continue ;

        if( check(c) && s.find(c) == s.end() ) s.insert(c) ;
        else if( !check(c) && s.find(c) != s.end() ) s.erase( s.find(c) ) ;

    }

}

bool join(int a, int b, bool ok )
{

    a = find(a) ;
    b = find(b) ;

    if(a==b) return false ;

    if( componente[a].size() > componente[b].size() ) swap( a , b  );

    pai[a] = b ;
    if( !reachable[b] && reachable[a] )
    {

        reachable[b] = true ;
        for(int i : componente[b] ) to_change(i) ;
    }

    for( int i : componente[a] )
    {
        componente[b].pb(i) ;
        if( ok ) to_change(i) ;
    }
    componente[a].clear() ;

    return true ;

}

int find_aux(int x)
{
    if( x == pai_aux[x] ) return x ;
    return pai_aux[x] = find_aux( pai_aux[x] ) ;
}
inline void join_aux(int a, int b)
{
    a = find_aux(a) ;
    b = find_aux(b) ;

    if( rand() % 2 ) swap(a,b) ;

    pai_aux[a] = b ;

}

int main()
{
    scanf("%d%d", &N , &T ) ;
    lp(i,1,N+1)
    {
        scanf("%d%d", &X[i] , &Y[i]) ;
        mp.insert( mk( mk( X[i] , Y[i] ) , i ) ) ;
        is_full[i] = true ;
        vet[i] = pai_aux[i] = i ;
    }

    idx = N ;

    lp(i,1,N+1)
    {
        for(int j = 0 ; j < 8 ; j++ )
        {

            int nx = dx[j] + X[i] ;
            int ny = dy[j] + Y[i] ;

            if( mp.find( mk(nx,ny) ) == mp.end() ) mp.insert( mk( mk(nx,ny) , ++idx ) ) ;

            if( is_full[ get_code(nx,ny) ] ) join_aux( i , get_code(nx,ny) ) ;

        }
    }

    lp(i,2,N+1)
        if( find_aux(i) != find_aux(1) ) {  printf("NO\n") ; return 0 ; }

    for(auto p : mp )
    {
        pai[ p.ss ] = p.ss ;
        componente[p.ss].pb( p.ss ) ;
    }

    int id = -1 , mn = inf ;

    for(auto p : mp )
        if( p.ff.ff < mn ) mn = p.ff.ff , id = p.ss ;
    reachable[id] = true ;

    for(auto p : mp )
    {

        if( is_full[p.ss] ) continue ;

        for(int i = 0 , nx , ny , c ; i < 4 ; i++ )
        {
            nx = dx[i] + p.ff.ff ;
            ny = dy[i] + p.ff.ss ;
            c = get_code(nx,ny) ;

            if( c == 0 || is_full[c] ) continue ;

            join( c , p.ss , false ) ;

        }

    }


    lp(i,1,N+1)
        if( check(i) ) s.insert(i) ;

    while( s.size() > 0 )
    {
        it = prev( s.end() ) ;

        int best_id = *it ;
        s.erase(it) ;

        ans.pb( best_id ) ;
        is_full[best_id] = false ;

        for(int i = 0 , nx , ny ,c ; i < 4 ; i++ )
        {
            nx = dx[i] + X[best_id] ;
            ny = dy[i] + Y[ best_id ] ;
            c = get_code( nx,ny ) ;

            if( is_full[c] ) continue ;

            join( c , best_id, true ) ;

        }

        to_change(best_id) ;

    }

    printf("YES\n") ;
    reverse(all(ans)) ;
    for(int i : ans ) printf("%d\n" , i ) ;

}

Compilation message

skyscrapers.cpp: In function 'bool identify_articulation(int)':
skyscrapers.cpp:92:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 1 ; i < group.size() ; i++ )
                     ~~^~~~~~~~~~~~~~
skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:181:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &N , &T ) ;
     ~~~~~^~~~~~~~~~~~~~~~~~
skyscrapers.cpp:184:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &X[i] , &Y[i]) ;
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 23808 KB ans=YES N=1
2 Correct 17 ms 23808 KB ans=YES N=4
3 Correct 17 ms 23808 KB ans=NO N=4
4 Correct 17 ms 23936 KB ans=YES N=5
5 Correct 17 ms 23808 KB ans=YES N=9
6 Correct 17 ms 23808 KB ans=YES N=5
7 Correct 17 ms 23808 KB ans=NO N=9
8 Correct 16 ms 23808 KB ans=NO N=10
9 Correct 16 ms 23936 KB ans=YES N=10
10 Correct 20 ms 23808 KB ans=YES N=10
11 Correct 17 ms 23808 KB ans=YES N=10
12 Correct 17 ms 23808 KB ans=YES N=9
13 Correct 17 ms 23808 KB ans=YES N=9
14 Correct 17 ms 23808 KB ans=YES N=8
15 Correct 20 ms 23808 KB ans=YES N=8
16 Correct 17 ms 23808 KB ans=NO N=2

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 23808 KB ans=YES N=1
2 Correct 17 ms 23808 KB ans=YES N=4
3 Correct 17 ms 23808 KB ans=NO N=4
4 Correct 17 ms 23936 KB ans=YES N=5
5 Correct 17 ms 23808 KB ans=YES N=9
6 Correct 17 ms 23808 KB ans=YES N=5
7 Correct 17 ms 23808 KB ans=NO N=9
8 Correct 16 ms 23808 KB ans=NO N=10
9 Correct 16 ms 23936 KB ans=YES N=10
10 Correct 20 ms 23808 KB ans=YES N=10
11 Correct 17 ms 23808 KB ans=YES N=10
12 Correct 17 ms 23808 KB ans=YES N=9
13 Correct 17 ms 23808 KB ans=YES N=9
14 Correct 17 ms 23808 KB ans=YES N=8
15 Correct 20 ms 23808 KB ans=YES N=8
16 Correct 17 ms 23808 KB ans=NO N=2
17 Correct 17 ms 23808 KB ans=YES N=17
18 Incorrect 17 ms 23808 KB Full cells must be connected
19 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 23808 KB ans=YES N=1
2 Correct 17 ms 23808 KB ans=YES N=4
3 Correct 17 ms 23808 KB ans=NO N=4
4 Correct 17 ms 23936 KB ans=YES N=5
5 Correct 17 ms 23808 KB ans=YES N=9
6 Correct 17 ms 23808 KB ans=YES N=5
7 Correct 17 ms 23808 KB ans=NO N=9
8 Correct 16 ms 23808 KB ans=NO N=10
9 Correct 16 ms 23936 KB ans=YES N=10
10 Correct 20 ms 23808 KB ans=YES N=10
11 Correct 17 ms 23808 KB ans=YES N=10
12 Correct 17 ms 23808 KB ans=YES N=9
13 Correct 17 ms 23808 KB ans=YES N=9
14 Correct 17 ms 23808 KB ans=YES N=8
15 Correct 20 ms 23808 KB ans=YES N=8
16 Correct 17 ms 23808 KB ans=NO N=2
17 Correct 17 ms 23808 KB ans=YES N=17
18 Incorrect 17 ms 23808 KB Full cells must be connected
19 Halted 0 ms 0 KB -

Subtask #4
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 24960 KB ans=NO N=1934
2 Correct 23 ms 24192 KB ans=NO N=1965
3 Incorrect 62 ms 24172 KB Full cells must be connected
4 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 23808 KB ans=YES N=1
2 Correct 17 ms 23808 KB ans=YES N=4
3 Correct 17 ms 23808 KB ans=NO N=4
4 Correct 17 ms 23936 KB ans=YES N=5
5 Correct 17 ms 23808 KB ans=YES N=9
6 Correct 17 ms 23808 KB ans=YES N=5
7 Correct 17 ms 23808 KB ans=NO N=9
8 Correct 16 ms 23808 KB ans=NO N=10
9 Correct 16 ms 23936 KB ans=YES N=10
10 Correct 20 ms 23808 KB ans=YES N=10
11 Correct 17 ms 23808 KB ans=YES N=10
12 Correct 17 ms 23808 KB ans=YES N=9
13 Correct 17 ms 23808 KB ans=YES N=9
14 Correct 17 ms 23808 KB ans=YES N=8
15 Correct 20 ms 23808 KB ans=YES N=8
16 Correct 17 ms 23808 KB ans=NO N=2
17 Correct 17 ms 23808 KB ans=YES N=17
18 Incorrect 17 ms 23808 KB Full cells must be connected
19 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 374 ms 31896 KB ans=NO N=66151
2 Correct 470 ms 53588 KB ans=NO N=64333
3 Incorrect 2396 ms 34336 KB Full cells must be connected
4 Halted 0 ms 0 KB -

Subtask #7
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 24960 KB ans=NO N=1934
2 Correct 23 ms 24192 KB ans=NO N=1965
3 Incorrect 62 ms 24172 KB Full cells must be connected
4 Halted 0 ms 0 KB -