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solver.c
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solver.c
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/* MARCH Satisfiability Solver
Copyright (C) 2001-2009 M.J.H. Heule, J.E. van Zwieten, and M. Dufour.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define CUBE_INC 1.05
#define CUBE_DEC 0.7
#define NEWSTYLE
#define DECISIONSONLY
#define TH_DEPTH 15
#define FACTOR_MAX 1000.0
//#define TH_FACTOR 1.0
//#define ADD_CONFLICT
//#define BACKJUMP
//#define LOCAL_AUTARKY
//#define DETECT_COMPONENTS
#define COMPENSATION_RESOLVENTS
#define SAT_INCREASE 1000
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <time.h>
#include <math.h>
#include "common.h"
#include "cube.h"
#include "distribution.h"
#include "solver.h"
#include "equivalence.h"
#include "preselect.h"
#include "memory.h"
#include "lookahead.h"
#include "progressBar.h"
#include "parser.h"
//#include "localbranch.h"
#ifndef __APPLE__
#include <malloc.h>
#endif
#define CONTINUE 1
#define FINISHED 0
#define IS_REDUCED_TIMP( __a, __b ) ((timeAssignments[__a] < NARY_MAX) && (timeAssignments[__b] == (NARY_MAX+1)) )
#ifdef DISTRIBUTION
#define LEFT_CHILD records[record_index].child[branch_literal > 0]
#define RIGHT_CHILD records[record_index].child[branch_literal < 0]
#endif
#ifdef SUPER_LINEAR
int sl_depth;
#endif
int *tmpEqImpSize;
int *TernaryImpTable, *TernaryImpLast;
int current_bImp_stamp, *bImp_stamps;
int *newbistack, *newbistackp, newbistackSize;
int *substack, *substackp, substackSize;
int analyze_autarky();
int nrofforced;
unsigned long long solution_bin = 0;
unsigned int solution_bits = 63;
int discrepancies = 0;
#ifdef DISTRIBUTION
float first_time;
int skip_flag = 0;
int first_depth = 20;
#endif
#ifdef SUBTREE_SIZE
int path_length;
#endif
#ifdef PLOT
int plotCount = 0;
#endif
#ifdef CUT_OFF
int last_SAT_bin = -1;
#endif
#ifdef BACKJUMP
int backjump_literal = 0;
#endif
int currentNodeNumber = 1;
int UNSATflag = 0;
#ifdef CUBE
int refute_compensation;
int progress_th;
int nr_assigned;
int size_flag;
FILE *output;
int current_Dnode;
#endif
#define STAMP_IMPLICATIONS( _nrval ) \
{ \
bImp = BIMP_START(_nrval); \
current_bImp_stamp++; \
bImp_stamps[ _nrval ] = current_bImp_stamp; \
for (i = BIMP_ELEMENTS; --i; ) \
bImp_stamps[ *(bImp++) ] = current_bImp_stamp; \
}
inline void push_stack_blocks( )
{
PUSH( r, STACK_BLOCK );
PUSH( imp, STACK_BLOCK );
PUSH( bieq, STACK_BLOCK );
PUSH( subsume, STACK_BLOCK );
current_node_stamp++;
}
#ifdef PROGRESS_BAR
#define NODE_START( ) \
{ \
push_stack_blocks( ); \
pb_descend( ); \
}
#define NODE_END( ) \
{ \
backtrack(); \
pb_climb(); \
}
#else
#define NODE_START( ) \
{ \
push_stack_blocks( ); \
}
#define NODE_END( ) \
{ \
backtrack(); \
}
#endif \
inline int recursive_solve( )
{
int _result = 0;
depth++;
PUSH( r, STACK_BLOCK );
_result = march_solve_rec();
depth--;
return _result;
}
#define UPDATE_BIN( ) \
{\
if( depth <= solution_bits ) solution_bin ^= (unsigned long long) 1 << (solution_bits - depth); \
}
/*
----------------------------------------------------
------------[ initializing and freeing ]------------
----------------------------------------------------
*/
void clearTernaryImpReduction( )
{
int i;
for( i = 1; i <= nrofvars; i++ )
{
TernaryImpReduction[ i ] = 0;
TernaryImpReduction[ -i ] = 0;
}
}
inline void fill_ternary_implication_arrays( )
{
int i, j, lit;
for( i = 0; i < nrofclauses; i++ )
if( Clength[ i ] == 3 )
{
for( j = 0; j < 3; j++ )
{
lit = Cv[i][j];
TernaryImp[lit][ tmpTernaryImpSize[lit]++ ] = Cv[i][(j+1)%3 ];
TernaryImp[lit][ tmpTernaryImpSize[lit]++ ] = Cv[i][(j+2)%3 ];
}
}
for( i = -nrofvars; i <= nrofvars; i++ )
TernaryImpSize[ i ] = tmpTernaryImpSize[ i ] / 2;
}
int initSolver()
{
int i, j, _tmp;
decisions = (int*) malloc( sizeof(int) * (nrofvars + 1) );
/* initialise global counters */
#ifdef CUBE
current_Dnode = 1;
init_assumptions();
part_free = nrofvars;
progress_th = 0;
nr_assigned = 0;
conflicts = 0;
refute_compensation = 0;
factor_th = FACTOR_MAX;
nr_cubes = 0;
for( i = 1; i <= nrofvars; i++ )
if( timeAssignments[ i ] >= VARMAX )
nr_assigned++;
#endif
current_node_stamp = 1;
lookDead = 0;
mainDead = 0;
#ifdef COUNT_SAT
count_sat = 0;
#endif
solution_bin = 0;
solution_bits = 63;
#ifdef DISTRIBUTION
first_time = 0;
skip_flag = 0;
first_depth = 20;
#endif
currentNodeNumber = 1;
UNSATflag = 0;
/* allocate recursion stack */
/* tree is max. nrofvars deep and we thus have max. nrofvars STACK_BLOCKS
-> 2 * nrofvars should be enough for everyone :)
*/
INIT_ARRAY( r , 3 * nrofvars + 1 );
INIT_ARRAY( imp , INITIAL_ARRAY_SIZE );
INIT_ARRAY( subsume , INITIAL_ARRAY_SIZE );
INIT_ARRAY( bieq , INITIAL_ARRAY_SIZE );
INIT_ARRAY( newbi , INITIAL_ARRAY_SIZE );
INIT_ARRAY( sub , INITIAL_ARRAY_SIZE );
MALLOC_OFFSET( bImp_satisfied, int, nrofvars, 2 );
MALLOC_OFFSET( bImp_start, int, nrofvars, 2 );
MALLOC_OFFSET( bImp_stamps, int, nrofvars, 0 );
MALLOC_OFFSET( node_stamps, tstamp, nrofvars, 0 );
tmpEqImpSize = (int*) malloc( sizeof(int) * (nrofvars+1) );
init_lookahead();
init_preselection();
#ifdef DISTRIBUTION
init_direction();
#endif
tmpTernaryImpSize = (int* ) malloc( sizeof(int ) * ( 2*nrofvars+1 ) );
#ifdef TERNARYLOOK
TernaryImp = (int**) malloc( sizeof(int*) * ( 2*nrofvars+1 ) );
TernaryImpSize = (int* ) malloc( sizeof(int ) * ( 2*nrofvars+1 ) );
for( i = 0; i <= 2 * nrofvars; i++ )
{
tmpTernaryImpSize[ i ] = 0;
TernaryImpSize [ i ] = 0;
}
for( i = 0; i < nrofclauses; i++ )
if( Clength[ i ] == 3 )
for( j = 0; j < 3; j++ )
TernaryImpSize[ Cv[ i ][ j ] + nrofvars ]++;
for( i = 0; i <= 2 * nrofvars; i++ )
TernaryImp[ i ] = (int*) malloc(sizeof(int)*(4*TernaryImpSize[i]+4));
tmpTernaryImpSize += nrofvars;
TernaryImp += nrofvars;
TernaryImpSize += nrofvars;
fill_ternary_implication_arrays();
for( i = -nrofvars; i <= nrofvars; i++ )
// tmpTernaryImpSize[ i ] = 2 * tmpTernaryImpSize[ i ] + 2;
tmpTernaryImpSize[ i ] = 4 * TernaryImpSize[ i ] + 2;
// branch_on_dummies_from_long_clauses();
while( AddTernaryResolvents() );
for( i = -nrofvars; i <= nrofvars; i++ )
free( TernaryImp[ i ] );
FREE_OFFSET( TernaryImp );
FREE_OFFSET( TernaryImpSize );
#else
tmpTernaryImpSize += nrofvars;
#endif
/* initialise global datastructures */
#ifdef GLOBAL_AUTARKY
MALLOC_OFFSET( TernaryImpReduction, int, nrofvars, 0 );
if( kSAT_flag )
{
int _nrofliterals = 0;
for( i = 0; i < nrofbigclauses; ++i )
_nrofliterals += clause_length[ i ];
clause_reduction = (int*) malloc( sizeof(int ) * nrofbigclauses );
clause_red_depth = (int*) malloc( sizeof(int ) * nrofbigclauses );
big_global_table = (int*) malloc( sizeof(int ) * _nrofliterals );
clause_SAT_flag = (int*) malloc( sizeof(int ) * nrofbigclauses );
MALLOC_OFFSET( big_to_binary, int*, nrofvars, NULL );
MALLOC_OFFSET( btb_size, int , nrofvars, 0 );
for( i = 0; i < nrofbigclauses; ++i )
{
clause_reduction[ i ] = 0;
clause_red_depth[ i ] = nrofvars;
clause_SAT_flag [ i ] = 0;
}
int tmp = 0;
for( i = 1; i <= nrofvars; i++ )
{
big_to_binary[ i ] = (int*) &big_global_table[ tmp ];
tmp += big_occ[ i ];
big_to_binary[ -i ] = (int*) &big_global_table[ tmp ];
tmp += big_occ[ -i ];
}
assert( tmp == _nrofliterals );
}
#endif
TernaryImp = (int**) malloc( sizeof(int*) * ( 2*nrofvars+1 ) );
TernaryImpSize = (int* ) malloc( sizeof(int ) * ( 2*nrofvars+1 ) );
TernaryImpLast = (int* ) malloc( sizeof(int ) * ( 2*nrofvars+1 ) );
TernaryImpTable = (int* ) malloc( sizeof(int ) * ( 6*nrofclauses+1 ) );
TernaryImp += nrofvars;
TernaryImpSize += nrofvars;
TernaryImpLast += nrofvars;
if( simplify_formula() == UNSAT )
{
#ifdef TRELOS
outputUnsat();
#endif
return UNSAT;
}
for( i = -nrofvars; i <= nrofvars; i++ )
{
tmpTernaryImpSize[ i ] = 0;
TernaryImpSize [ i ] = 0;
bImp_satisfied [ i ] = 2; //waarom staat dit hier?
}
for( i = 0; i < nrofclauses; i++ )
if( Clength[ i ] == 3 )
for( j = 0; j < 3; j++ )
TernaryImpSize[ Cv[ i ][ j ] ]++;
_tmp = 0;
for( i = -nrofvars; i <= nrofvars; i++ )
{
TernaryImp[ i ] = TernaryImpTable + 2 * _tmp;
_tmp += TernaryImpSize[ i ];
TernaryImpLast[ i ] = TernaryImpSize[ i ];
}
fill_ternary_implication_arrays();
rebuild_BinaryImp();
init_freevars();
for( i = 0; i < nrofceq ; i++ )
assert( CeqSizes[ i ] != 1 );
#ifdef EQ
for( i = 0; i < nrofceq ; i++ )
if( CeqSizes[ i ] == 2 )
DPLL_propagate_binary_equivalence( i );
#endif
#ifdef DETECT_COMPONENTS
init_localbranching();
#endif
#ifdef CUT_OFF
solution_bits = CUT_OFF - 1;
#endif
push_stack_blocks();
return 1;
}
void disposeSolver()
{
if( kSAT_flag )
{
free_big_clauses_datastructures();
FREE( clause_reduction );
FREE( big_global_table );
FREE( clause_red_depth );
FREE( clause_SAT_flag );
FREE_OFFSET( big_to_binary );
FREE_OFFSET( btb_size );
}
free_BinaryImp();
dispose_lookahead();
dispose_preselection();
dispose_freevars();
FREE_OFFSET( TernaryImp );
FREE_OFFSET( TernaryImpSize );
FREE_OFFSET( tmpTernaryImpSize );
FREE_OFFSET( bImp_stamps );
FREE_OFFSET( bImp_satisfied );
FREE_OFFSET( node_stamps );
FREE( tmpEqImpSize );
FREE( impstack );
FREE( rstack );
}
int propagate_forced_literals()
{
int _freevars = freevars;
if( IFIUP( 0, FIX_FORCED_LITERALS ) == UNSAT )
return UNSAT;
nrofforced = _freevars - freevars;
percentage_forced = 100.0 * nrofforced / (double) _freevars;
// printf("c lookahead forced %.1f \% variables at depth %i\n", percentage_forced, depth );
return SAT;
}
#ifdef SUPER_LINEAR
int super_linear_branching()
{
int _result;
sl_depth = 1;
do
{
_result = march_solve_rec();
if( _result != UNSAT )
return _result;
#ifdef TIMEOUT
if( (int) clock() > CLOCKS_PER_SEC * TIMEOUT )
return UNKNOWN;
#endif
pb_reset();
sl_depth++;
}
while(1);
return UNSAT;
}
#endif
#ifdef DISTRIBUTION // naar distribution.c
int distribution_branching()
{
int _result;
target_rights = 0;
current_rights = 0;
current_record = 0;
first_time = (float) clock();
do
{
assert( target_rights <= jump_depth );
#ifdef SUBTREE_SIZE
path_length = 1;
#endif
_result = march_solve_rec();
if( _result != UNSAT )
return _result;
#ifdef TIMEOUT
if( (int) clock() > CLOCKS_PER_SEC * TIMEOUT )
return UNKNOWN;
#endif
#ifndef CUT_OFF
pb_reset();
#endif
target_rights++;
current_record = 1;
// print_records();
}
while( records[1].UNSAT_flag == 0 );
return UNSAT;
}
#endif
#ifdef DISTRIBUTION
int skip_node( )
{
if( depth < jump_depth )
if( (target_rights < current_rights) ||
(target_rights >= (current_rights + jump_depth - depth)) )
return 1;
return 0;
}
#endif
void printConflict()
{
if( kSAT_flag )
{
int i, *_rstackp = rstack;
printf("c at depth %i add conflict: ", depth );
while( _rstackp < rstackp )
{
i = *(_rstackp++);
if( timeAssignments[ i ] >= NARY_MAX ) // is dit nodig???
{
if( (TernaryImpReduction[ i ] + TernaryImpReduction[ -i ]) != 0 )
{
if( timeAssignments[ i ] & 1 ) printf("%i ", i );
else printf("%i ", -i );
}
else
{
printf("* ");
// if( timeAssignments[ i ] & 1 ) printf("(%i) ", i );
// else printf("(%i) ", -i );
}
}
}
printf("\n\n");
}
}
#ifdef CUBE
void addClause()
{
Dnode_setType( current_Dnode, REFUTED_DNODE );
conflicts++;
refute_compensation +=5;
factor_th *= CUBE_DEC;
}
#endif
#ifdef TRELOS
void outputUnsat( )
{
FILE *trelos;
trelos = fopen ("/tmp/trelos", "w");
fprintf(trelos, "p cnf 1 2\n1 0\n-1 0\n" );
fclose(trelos);
}
void outputFormula( )
{
int i, j, lit;
int *bImp, cls;
FILE *trelos;
trelos = fopen ("/tmp/trelos", "w");
cls=0;
for( i = -nrofvars; i <= nrofvars; i++ )
if( timeAssignments[ i ] == VARMAX ) cls++;
for( i = 0; i < nrofclauses; i++ )
{
if( Clength[ i ] == 2 ) continue;
for( j = 0; j < Clength[ i ]; j++ )
if( timeAssignments[ Cv[i][j] ] == VARMAX ) continue;
cls++;
}
for( i = -nrofvars; i <= nrofvars; i++ )
{
bImp = BIMP_START( i);
for( j = BIMP_ELEMENTS; --j; )
{
lit = *(bImp++);
if( -i > lit )
cls++;
}
}
fprintf(trelos, "p cnf %i %i\n", nrofvars, cls );
for( i = -nrofvars; i <= nrofvars; i++ )
if( timeAssignments[ i ] == VARMAX )
fprintf(trelos, "%i 0\n", i );
for( i = 0; i < nrofclauses; i++ )
{
if( Clength[ i ] == 2 ) continue;
for( j = 0; j < Clength[ i ]; j++ )
if( timeAssignments[ Cv[i][j] ] == VARMAX ) continue;
for( j = 0; j < Clength[ i ]; j++ ) fprintf(trelos, "%i ", Cv[ i ][ j]);
fprintf(trelos, "0\n");
}
for( i = -nrofvars; i <= nrofvars; i++ )
{
bImp = BIMP_START( i);
for( j = BIMP_ELEMENTS; --j; )
{
lit = *(bImp++);
if( -i > lit )
fprintf(trelos, "%i %i 0\n", -i, lit );
}
}
fclose(trelos);
}
#endif
int march_solve_rec()
{
int branch_literal = 0, _result, _percentage_forced;
int skip_left = 0, skip_right = 0, top_flag = 0;
nodeCount++;
#ifdef CUBE
Dnode_init( current_Dnode );
factor_th *= CUBE_INC;
#ifdef DEPTH_CUTOFF
if( part_free > 100000 || original_nrofclauses < 10000 )
{
if( depth > (30 - log2(original_nrofclauses)) ) factor_th *= CUBE_DEC;
}
else if( depth > 20 ) factor_th *= CUBE_DEC;
// if( depth > 40 )
// if( depth > 25 )
// if( depth > 20 )
// if( depth > (30 - log2(original_nrofclauses)) )
// if( depth + 15 * discrepancies > 100 )
// if( depth + discrepancies > 25 )
// if( discrepancies > 3 )
// factor_th *= CUBE_DEC;
#endif
// if( nr_assigned * (discrepancies) >= factor_th * part_free )
// if( nr_assigned * (discrepancies + depth) >= factor_th * part_free )
// if( nr_assigned * (discrepancies + depth) * (discrepancies + depth) >= factor_th * part_free )
// if( nr_assigned * depth * (discrepancies + 1) >= factor_th * part_free )
// if( nr_assigned * depth * depth >= 15.0 * part_free )
if( nr_assigned * depth * depth >= factor_th * part_free )
// if( nr_assigned * depth * depth * depth >= factor_th * part_free )
{
nodeCount--;
nr_cubes++;
Dnode_setType( current_Dnode, CUBE_DNODE );
return UNSAT;
}
#endif
#ifdef DISTRIBUTION
int record_index = current_record;
top_flag = TOP_OF_TREE;
if( fix_recorded_literals(record_index) == UNSAT )
return UNSAT;
if( record_index == 0 ) record_index = init_new_record( );
#endif
#ifdef SUPER_LINEAR
if( depth < sl_depth ) subtree_size = 0;
else if( subtree_size == SL_MAX ) return UNSAT;
else subtree_size++;
#endif
#ifdef TIMEOUT
if( (int) clock() > CLOCKS_PER_SEC * TIMEOUT )
return UNKNOWN;
#endif
#ifdef SUBTREE_SIZE
path_length++;
#endif
#ifdef CUT_OFF
if( depth <= CUT_OFF ) last_SAT_bin = -1;
if( solution_bin == last_SAT_bin )
{
#ifdef DISTRIBUTION
records[ record_index ].UNSAT_flag = 1;
#endif
return UNSAT;
}
#endif
#ifdef DETECT_COMPONENTS
determine_components();
#endif
#ifdef DISTRIBUTION
branch_literal = records[record_index].branch_literal;
if( branch_literal != 0 ) dist_acc_flag = 1;
else
// if( branch_literal == 0 )
#endif
do
{
#ifdef LOCAL_AUTARKY
int _depth;
_depth = analyze_autarky();
if( _depth == 0 )
printf("c global autarky found at depth %i\n", depth );
else if( _depth != depth )
printf("c autarky found at depth %i (from %i)\n", depth, _depth );
#endif
// if( PreselectAll() == 0 )
// return verifySolution();
if( ConstructCandidatesSet() == 0 )
{
if( depth > 0 )
{
if( checkSolution() == SAT ) return verifySolution();
}
if( PreselectAll() == 0 )
return verifySolution();
}
else ConstructPreselectedSet();
if( lookahead() == UNSAT )
{
lookDead++;
#ifdef CUBE
addClause();
#endif
#ifdef TRELOS
outputUnsat ();
#endif
return UNSAT;
}
if( propagate_forced_literals() == UNSAT )
{
#ifdef CUBE
addClause();
#endif
#ifdef TRELOS
outputUnsat ();
#endif
return UNSAT;
}
#ifdef TRELOS
if( depth == 0 )
{
outputFormula();
return UNKNOWN;
}
#endif
branch_literal = get_signedBranchVariable();
#ifdef FLIP_BIAS
branch_literal *= -1;
#endif
// printf("c branch literal %i", branch_literal );
}
while( (percentage_forced > 50.0) || (branch_literal == 0) );
#ifdef PLOT
if( plotCount++ >= 10000 )
return UNSAT;
printf("\t%i\t%.3f\t%i\n", plotCount, sum_plot / count_plot, depth );
#endif
_percentage_forced = percentage_forced;
#ifdef PARALLEL
if( depth < para_depth )
if( para_bin & (1 << (para_depth - depth - 1) ) )
branch_literal *= -1;
#endif
// printf("branch_literal = %i at depth %i\n", branch_literal, depth );
#ifdef GLOBAL_AUTARKY
if( depth == 0 )
{
int i;
for( i = 1; i <= nrofvars; i++ )
{
TernaryImpReduction[ i ] = 0;
TernaryImpReduction[ -i ] = 0;
if( kSAT_flag )
{
btb_size[ i ] = 0;
btb_size[ -i ] = 0;
}
}
if( kSAT_flag )
for( i = 0; i < nrofbigclauses; ++i )
clause_reduction[ i ] = 0;
// branch_literal = 10;
}
#endif
NODE_START();
#ifdef DISTRIBUTION
if( top_flag )
{
branch_literal *= -1;
current_rights++;
UPDATE_BIN();
}
skip_left = skip_node();
#endif
discrepancies++;
#ifdef CUBE
int tmp_Dnode = current_Dnode;
current_Dnode = Dnode_left( current_Dnode );
Dnode_setDecision( current_Dnode, branch_literal );
#endif
if( (skip_left==0) && IFIUP( branch_literal, FIX_BRANCH_VARIABLE ) )
{
#ifdef DISTRIBUTION
current_record = LEFT_CHILD;
#endif
_result = recursive_solve();
#ifdef DISTRIBUTION
LEFT_CHILD = current_record;
#endif
if( _result == SAT || _result == UNKNOWN ) return _result; }
else {
#ifdef DISTRIBUTION
if( (LEFT_CHILD != 0) && records[ LEFT_CHILD ].UNSAT_flag == 0 )
{
records[ LEFT_CHILD ].UNSAT_flag = 1;
// printf("c left child %i UNSAT by parent!\n", LEFT_CHILD );
}
#endif
PUSH( r, STACK_BLOCK );}
#ifdef CUBE
current_Dnode = tmp_Dnode;
#endif
discrepancies--;
NODE_END();
#ifdef BACKJUMP
if( backjump_literal != 0 )
if( timeAssignments[ backjump_literal ] >= NARY_MAX )
{
// printf("backjumping at depth %i due to literal %i\n", depth, backjump_literal );
return UNSAT;
}
backjump_literal = 0;
#endif
#ifdef DISTRIBUTION
if( top_flag )
{
current_rights--;
UPDATE_BIN();
}
#endif
percentage_forced = _percentage_forced;
#ifdef PARALLEL
if( depth < para_depth ) goto parallel_skip_node;
#endif
#ifdef GLOBAL_AUTARKY
if( depth == 0 )
if( kSAT_flag )
{
int i;
for( i = 1; i <= nrofvars; ++i )
{
assert( TernaryImpReduction[ i ] == 0 );
assert( TernaryImpReduction[ -i ] == 0 );
assert( btb_size[ i ] == 0 );
assert( btb_size[ -i ] == 0 );
}
for( i = 0; i < nrofbigclauses; ++i )
{
clause_red_depth[ i ] = nrofvars;
clause_SAT_flag [ i ] = 0;
}
}
if( kSAT_flag )
{
int i;
for( i = 1; i <= nrofvars; ++i )
{
assert( TernaryImpReduction[ i ] >= 0 );
assert( TernaryImpReduction[ -i ] >= 0 );
assert( btb_size[ i ] >= 0 );
assert( btb_size[ -i ] >= 0 );
}
}
#endif
#ifdef CUBE
if( progress_th == depth && progress_th < 10)
{
progress_th++;
// printf("c progress %i\n", progress_th );
}
#endif
NODE_START();
if( top_flag == 0 )
{
#ifdef DISTRIBUTION
current_rights++;
#endif
UPDATE_BIN();
}
#ifdef DISTRIBUTION
skip_right = skip_node();
#endif
// discrepancies++;
#ifdef CUBE
tmp_Dnode = current_Dnode;
current_Dnode = Dnode_right( current_Dnode );
Dnode_setDecision( current_Dnode, -branch_literal );
#endif
if( (skip_right == 0) && IFIUP( -branch_literal, FIX_BRANCH_VARIABLE ) )
{
#ifdef DISTRIBUTION
current_record = RIGHT_CHILD;
#endif
_result = recursive_solve();
#ifdef DISTRIBUTION