题目：http://www.lydsy.com/JudgeOnline/problem.php?id=2816
难得这道题保证了是一条链，我居然还去写LCT。。。（其实k棵splay同样可以解决问题的）
代码（边换颜色居然可以换成与之前一样的。。。）：
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <set>
using namespace std ;
#define REP( i , l , r ) for ( int i = l ; i <= r ; ++ i )
#define rep( i , x ) for ( int i = 0 ; i ++ < x ; )
const int maxn = 10100 , maxc = 11 ;
struct link_cut_tree {
#define C( t ) ( t == L( F( t ) ) )
#define L( t ) left[ t ]
#define R( t ) right[ t ]
#define M( t ) Max[ t ]
#define T( t ) Tag[ t ]
#define F( t ) father[ t ]
#define P( t ) parent[ splay_root( t ) ]
#define G( t ) F( F( t ) )
#define V( t ) value[ t ]
int left[ maxn ] , right[ maxn ] , Max[ maxn ] , parent[ maxn ] , father[ maxn ] , value[ maxn ] ;
bool Tag[ maxn ] ;
link_cut_tree( ) {
memset( left , 0 , sizeof( left ) ) ;
memset( right , 0 , sizeof( right ) ) ;
memset( right , 0 , sizeof( right ) ) ;
memset( parent , 0 , sizeof( parent ) ) ;
memset( father , 0 , sizeof( father ) ) ;
memset( Max , 0 , sizeof( Max ) ) ;
memset( Tag , false , sizeof( Tag ) ) ;
}
inline void pushdown( int t ) {
if ( T( t ) && t ) {
swap( L( t ) , R( t ) ) ;
T( L( t ) ) ^= true , T( R( t ) ) ^= true , T( t ) = false ;
}
}
inline void update( int t ) {
M( t ) = max( max( M( L( t ) ) , M( R( t ) ) ) , V( t ) ) ;
}
inline void zag( int t ) {
pushdown( t ) ; pushdown( R( t ) ) ;
int k = R( t ) , u = F( t ) ; bool flag = C( t ) ;
update( F( R( t ) = L( k ) ) = t ) ;
update( F( L( k ) = t ) = k ) ;
if ( F( k ) = u ) if ( flag ) L( u ) = k ; else R( u ) = k ;
}
inline void zig( int t ) {
pushdown( t ) ; pushdown( L( t ) ) ;
int k = L( t ) , u = F( t ) ; bool flag = C( t ) ;
update( F( L( t ) = R( k ) ) = t ) ;
update( F( R( k ) = t ) = k ) ;
if ( F( k ) = u ) if ( flag ) L( u ) = k ; else R( u ) = k ;
}
inline void splay( int t ) {
while ( F( t ) ) {
pushdown( G( t ) ) ; pushdown( F( t ) ) ; pushdown( t ) ;
if ( ! G( t ) ) if ( C( t ) ) zig( F( t ) ) ; else zag( F( t ) ) ; else {
if ( C( t ) ) {
if ( C( F( t ) ) ) zig( G( t ) ) ; zig( F( t ) ) ;
} else {
if ( ! C( F( t ) ) ) zag( G( t ) ) ; zag( F( t ) ) ;
}
}
}
}
inline int splay_root( int t ) {
splay( t ) ;
for ( pushdown( t ) ; L( t ) ; pushdown( t = L( t ) ) ) ;
return t ;
}
inline int Access( int t ) {
int v = 0 ;
do {
splay( t ) ; pushdown( t ) ;
F( R( t ) ) = 0 ; P( R( t ) ) = t ;
update( F( R( t ) = v ) = t ) ;
v = t ; t = P( t ) ;
} while ( t ) ;
return v ;
}
inline void Join( int v , int u ) {
P( v ) = u ;
}
inline void cut( int v ) {
Access( v ) ; splay( v ) ; pushdown( v ) ;
F( L( v ) ) = 0 ; L( v ) = 0 ; update( v ) ; P( v ) = 0 ;
}
inline void Link( int v , int u ) {
Access( v ) ; splay( v ) ; T( v ) ^= true ;
Join( v , u ) ;
}
inline void Cut( int v , int u ) {
Access( v ) ; int lca = Access( u ) ;
if ( lca == v ) cut( u ) ; else cut( v ) ;
}
inline int Query( int v , int u ) {
Access( v ) ; int lca = Access( u ) ;
if ( lca == v ) {
splay( v ) ; pushdown( v ) ;
return max( V( v ) , M( R( v ) ) ) ;
} else {
splay( v ) ; splay( lca ) ; pushdown( lca ) ;
return max( max( V( lca ) , M( R( lca ) ) ) , M( v ) ) ;
}
}
inline void change( int v , int w ) {
splay( v ) ;
V( v ) = w ; update( v ) ;
}
inline int get_root( int v ) {
Access( v ) ;
return splay_root( v ) ;
}
} lct[ maxc ] , L ;
int n , m , C , k ;
struct edge {
int s , t , w ;
edge( int _s , int _t , int _w ) : s( min( _s , _t ) ) , t( max( _s , _t ) ) , w( _w ) {
}
bool operator < ( const edge &x ) const {
return s < x.s || ( s == x.s && t < x.t ) ;
}
bool operator == ( const edge &x ) const {
return s == x.s && t == x.t ;
}
bool operator > ( const edge &x ) const {
return s > x.s || ( s == x.s && t > x.t ) ;
}
} ;
set < edge > bst ;
int D[ maxc ][ maxn ] ;
int main( ) {
memset( D , 0 , sizeof( D ) ) ;
scanf( "%d%d%d%d" , &n , &m , &C , &k ) ;
int val ;
rep( i , n ) {
scanf( "%d" , &val ) ;
REP( j , 0 , ( C - 1 ) ) {
lct[ j ].Max[ i ] = lct[ j ].value[ i ] = val ;
}
}
while ( m -- ) {
int s , t , w ; scanf( "%d%d%d" , &s , &t , &w ) ;
lct[ w ].Link( s , t ) , bst.insert( edge( s , t , w ) ) ;
D[ w ][ s ] ++ , D[ w ][ t ] ++ ;
}
int K = 0 ;
while ( k -- ) {
int a , b , c , d ; scanf( "%d" , &a ) ;
if ( ! a ) {
scanf( "%d%d" , &b , &c ) ;
REP( j , 0 , ( C - 1 ) ) lct[ j ].change( b , c ) ;
} else if ( a == 1 ) {
scanf( "%d%d%d" , &b , &c , &d ) ;
set < edge > :: iterator p = bst.find( edge( b , c , d ) ) ;
if ( p == bst.end( ) ) {
printf( "No such edge.\n" ) ; continue ;
}
if ( p -> w == d ) {
printf( "Success.\n" ) ; continue ;
}
if ( D[ d ][ b ] > 1 || D[ d ][ c ] > 1 ) {
printf( "Error 1.\n" ) ; continue ;
}
if ( lct[ d ].get_root( b ) == lct[ d ].get_root( c ) ) {
printf( "Error 2.\n" ) ; continue ;
}
printf( "Success.\n" ) ;
lct[ p -> w ].Cut( b , c ) ; lct[ d ].Link( b , c ) ;
D[ p -> w ][ b ] -- , D[ p -> w ][ c ] -- , D[ d ][ b ] ++ , D[ d ][ c ] ++ ;
bst.erase( p ) ; bst.insert( edge( b , c , d ) ) ;
} else {
scanf( "%d%d%d" , &b , &c , &d ) ;
if ( lct[ b ].get_root( c ) != lct[ b ].get_root( d ) ) {
printf( "-1\n" ) ; continue ;
}
printf( "%d\n" , lct[ b ].Query( c , d ) ) ;
}
}
return 0 ;
}
网友评论