org.chocosolver.util.objects.setDataStructures.iterable.IntIterableSetUtils Maven / Gradle / Ivy
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/*
* This file is part of choco-solver, http://choco-solver.org/
*
* Copyright (c) 2020, IMT Atlantique. All rights reserved.
*
* Licensed under the BSD 4-clause license.
*
* See LICENSE file in the project root for full license information.
*/
package org.chocosolver.util.objects.setDataStructures.iterable;
import org.chocosolver.solver.variables.IntVar;
import org.chocosolver.util.iterators.DisposableRangeIterator;
import java.util.Arrays;
/**
*
*
* Project: choco.
* @author Charles Prud'homme
* @since 25/01/2016.
*/
public class IntIterableSetUtils {
/**
* Copy the domain of var into an {@link IntIterableRangeSet}.
* @param var an integer variable
* @return set to transfer values to
*/
public static IntIterableRangeSet extract(IntVar var) {
IntIterableRangeSet set = new IntIterableRangeSet();
copyIn(var, set);
return set;
}
/**
* Copy the domain of var in set.
* First, it clears set, then it fills it with the value in var.
*
* @param var an integer variable
* @param set set to transfer values to
*/
public static void copyIn(IntVar var, IntIterableRangeSet set) {
set.clear();
DisposableRangeIterator rit = var.getRangeIterator(true);
while (rit.hasNext()) {
int lb = rit.min();
int ub = rit.max();
set.pushRange(lb,ub);
rit.next();
}
rit.dispose();
}
/**
* @param set on which the complement is based
* @param lbu lower bound (inclusive) of the universe
* @param ubu upper bound (inclusive) of the universe
* @return the complement of this set wrt to universe set [lbu, ubu].
* Values smaller than lbu and greater than ubu are ignored.
*/
public static IntIterableRangeSet complement(IntIterableRangeSet set, int lbu, int ubu) {
assert lbu <= ubu;
IntIterableRangeSet t = new IntIterableRangeSet();
t.ELEMENTS = new int[set.SIZE + 2];
int i = 0;
int lb = lbu;
while (i < set.SIZE && set.ELEMENTS[i] <= lbu) {
i += 2;
lb = set.ELEMENTS[i - 1] + 1;
}
if (i == set.SIZE) {
if (lb <= ubu) {
t.pushRange(lb, ubu);
}// else: empty set
} else {
assert set.ELEMENTS[i] > lb;
t.pushRange(lb, set.ELEMENTS[i++] - 1);
while (i < set.SIZE - 2 && set.ELEMENTS[i] < ubu) {
t.pushRange(set.ELEMENTS[i++] + 1, set.ELEMENTS[i++] - 1);
}
if (set.ELEMENTS[i] < ubu) {
t.pushRange(set.ELEMENTS[i] + 1, ubu);
}
}
return t;
}
/**
* @param set1 a set of ints
* @param set2 a set of ints
* @return return a set {a + b | a in set1, b in set2}
*/
public static IntIterableRangeSet plus(IntIterableRangeSet set1, IntIterableRangeSet set2) {
IntIterableRangeSet t = new IntIterableRangeSet();
plus(t, set1, set2);
return t;
}
/**
* Set setr to {a + b | a in set1, b in set2}
*
* @param setr set of ints
* @param set1 a set of ints
* @param set2 a set of ints
*/
public static void plus(IntIterableRangeSet setr, IntIterableRangeSet set1, IntIterableRangeSet set2) {
setr.clear();
int s1 = set1.SIZE >> 1;
int s2 = set2.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
setr.grow(set1.SIZE);
int i = 0, j = 0;
int[] is = new int[s2];
Arrays.fill(is, -1);
is[0] = 0;
int lb = set1.ELEMENTS[0] + set2.ELEMENTS[0];
int ub = set1.ELEMENTS[1] + set2.ELEMENTS[1];
do {
boolean extend = false;
for (int k = i; k <= j; k++) {
int _lb = set1.ELEMENTS[is[k] << 1] + set2.ELEMENTS[k << 1];
if (lb <= _lb && _lb <= ub + 1) {
ub = Math.max(set1.ELEMENTS[(is[k] << 1) + 1] + set2.ELEMENTS[(k << 1) + 1], ub);
extend = true;
// add neighbors to evaluate
// 1. left neighbor
if (k < s2 - 1 && k == j) {
is[k + 1]++;
if (is[k + 1] == 0) {
j++;
}
}
// 2. bottom neighbor
is[k]++;
if (is[k] == s1) {
i++;
}
}
}
if (!extend) {
setr.pushRange(lb, ub);
lb = Integer.MAX_VALUE;
for (int k = i; k <= j; k++) {
int _lb = set1.ELEMENTS[is[k] << 1] + set2.ELEMENTS[k << 1];
if (lb > _lb) {
lb = _lb;
ub = set1.ELEMENTS[(is[k] << 1) + 1] + set2.ELEMENTS[(k << 1) + 1];
}
}
}
} while (is[s2 - 1] < s1);
setr.pushRange(lb, ub);
}
}
/**
* Set setr to {a + b | a in set1, b in [l..u]}
*
* @param setr set of ints
* @param set1 a set of ints
* @param l an int
* @param u an int
*/
public static void plus(IntIterableRangeSet setr, IntIterableRangeSet set1, int l, int u) {
setr.clear();
int s1 = set1.SIZE >> 1;
if (s1 > 0 && l <= u) {
int k = 0;
setr.grow(set1.SIZE);
int lb = set1.ELEMENTS[0] + l;
int ub = set1.ELEMENTS[1] + u;
for (; k < s1; k++) {
int _lb = set1.ELEMENTS[k << 1] + l;
if (lb <= _lb && _lb <= ub + 1) {
ub = Math.max(set1.ELEMENTS[(k << 1) + 1] + u, ub);
} else {
setr.pushRange(lb, ub);
lb = set1.ELEMENTS[k << 1] + l;
ub = set1.ELEMENTS[(k << 1) + 1] + u;
}
}
setr.pushRange(lb,ub);
}
}
/**
* @param set1 a set of ints
* @param set2 a set of ints
* @return return a set {a - b | a in set1, b in set2}
*/
public static IntIterableRangeSet minus(IntIterableRangeSet set1, IntIterableRangeSet set2) {
IntIterableRangeSet t = new IntIterableRangeSet();
minus(t, set1, set2);
return t;
}
/**
* Set setr to {a - b | a in set1, b in set2}
*
* @param setr set of ints
* @param set1 a set of ints
* @param set2 a set of ints
*/
public static void minus(IntIterableRangeSet setr, IntIterableRangeSet set1, IntIterableRangeSet set2) {
setr.clear();
int s1 = set1.SIZE >> 1;
int s2 = set2.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
setr.grow(set1.SIZE);
int i = s2 - 1, j = s2 - 1;
int[] is = new int[s2];
Arrays.fill(is, -1);
is[s2 - 1] = 0;
int lb = set1.ELEMENTS[0] - set2.ELEMENTS[((s2 - 1) << 1) + 1];
int ub = set1.ELEMENTS[1] - set2.ELEMENTS[(s2 - 1) << 1];
do {
boolean extend = false;
for (int k = j; k >= i; k--) {
int _lb = set1.ELEMENTS[is[k] << 1] - set2.ELEMENTS[(k << 1) + 1];
if (lb <= _lb && _lb <= ub + 1) {
ub = Math.max(set1.ELEMENTS[(is[k] << 1) + 1] - set2.ELEMENTS[(k << 1)], ub);
extend = true;
// add neighbors to evaluate
// 1. left neighbor
if (k > 0 && k == i) {
is[k - 1]++;
if (is[k - 1] == 0) {
i--;
}
}
// 2. bottom neighbor
is[k]++;
if (is[k] == s1) {
j--;
}
}
}
if (!extend) {
setr.pushRange(lb, ub);
lb = Integer.MAX_VALUE;
for (int k = i; k <= j; k++) {
int _lb = set1.ELEMENTS[is[k] << 1] - set2.ELEMENTS[(k << 1) + 1];
if (lb > _lb) {
lb = _lb;
ub = set1.ELEMENTS[(is[k] << 1) + 1] - set2.ELEMENTS[k << 1];
}
}
}
} while (is[0] < s1);
setr.pushRange(lb, ub);
}
}
/**
* Set setr to {a - b | a in set1, b in [l..u]}
*
* @param setr set of ints
* @param set1 a set of ints
* @param l an int
* @param u an int
*/
public static void minus(IntIterableRangeSet setr, IntIterableRangeSet set1, int l, int u) {
setr.clear();
int s1 = set1.SIZE >> 1;
if (s1 > 0 && l <= u) {
setr.grow(set1.SIZE);
int k = s1;
int lb = set1.ELEMENTS[0] - u;
int ub = set1.ELEMENTS[1] - l;
for (; k >= 0; k--) {
int _lb = set1.ELEMENTS[k << 1] - u;
if (lb <= _lb && _lb <= ub + 1) {
ub = Math.max(set1.ELEMENTS[(k << 1) + 1] - l, ub);
} else {
setr.pushRange(lb, ub);
lb = set1.ELEMENTS[k << 1] - u;
ub = set1.ELEMENTS[(k << 1) + 1] - l;
}
}
setr.pushRange(lb, ub);
}
}
/**
* @param set1 a set of ints
* @param set2 a set of ints
* @return return a set = set1 ∩ set2
*/
public static IntIterableRangeSet intersection(IntIterableRangeSet set1, IntIterableRangeSet set2) {
IntIterableRangeSet t = new IntIterableRangeSet();
intersection(t, set1, set2);
return t;
}
/**
* Set setr to set1 ∩ set2
*
* @param setr set of ints
* @param set1 a set of ints
* @param set2 a set of ints
*/
@SuppressWarnings("Duplicates")
public static void intersection(IntIterableRangeSet setr, IntIterableRangeSet set1, IntIterableRangeSet set2) {
setr.clear();
int s1 = set1.SIZE >> 1;
int s2 = set2.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
setr.grow(set1.SIZE);
int i = 0, j = 0;
int lbi, ubi, lbj, ubj, lb, ub;
lbi = set1.ELEMENTS[0];
ubi = set1.ELEMENTS[1];
lbj = set2.ELEMENTS[0];
ubj = set2.ELEMENTS[1];
while (i < s1 && j < s2) {
if ((lbi <= lbj && lbj <= ubi) || (lbj <= lbi && lbi <= ubj)) {
lb = Math.max(lbi, lbj);
ub = Math.min(ubi, ubj);
setr.pushRange(lb, ub);
}
if (ubi <= ubj && ++i < s1) {
lbi = set1.ELEMENTS[i << 1];
ubi = set1.ELEMENTS[(i << 1) + 1];
}else if (ubj <= ubi && ++j < s2) {
lbj = set2.ELEMENTS[j << 1];
ubj = set2.ELEMENTS[(j << 1) + 1];
}
}
}
}
/**
* Set setr to set1 ∩ [from,to]
*
* @param setr set of ints
* @param set1 a set of ints
* @param from lower bound of an interval
* @param to upper bound of an interval
*/
@SuppressWarnings("Duplicates")
public static void intersection(IntIterableRangeSet setr, IntIterableRangeSet set1, int from, int to) {
setr.clear();
int s1 = set1.SIZE >> 1;
int s2 = from <= to ? 1 : 0;
if (s1 > 0 && s2 > 0) {
setr.grow(set1.SIZE);
int i = 0, j = 0;
int lbi, ubi, lbj, ubj, lb, ub;
lbi = set1.ELEMENTS[0];
ubi = set1.ELEMENTS[1];
lbj = from;
ubj = to;
while (i < s1 && j < s2) {
if ((lbi <= lbj && lbj <= ubi) || (lbj <= lbi && lbi <= ubj)) {
lb = Math.max(lbi, lbj);
ub = Math.min(ubi, ubj);
setr.pushRange(lb, ub);
}
if (ubi <= ubj && ++i < s1) {
lbi = set1.ELEMENTS[i << 1];
ubi = set1.ELEMENTS[(i << 1) + 1];
}else if(ubj <= ubi){
j++;
}
}
}
}
/**
* Set set1 to set1 ∩ set2
*
* @param set1 a set of ints
* @param set2 a set of ints
* @return true if set1 has changed
*/
@SuppressWarnings("Duplicates")
public static boolean intersectionOf(IntIterableRangeSet set1, IntIterableRangeSet set2) {
boolean change = false;
int s1 = set1.SIZE >> 1;
int s2 = set2.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
int i = 0, j = 0;
int s = 0, c = 0;
int[] e = new int[set1.SIZE];
int lbi, ubi, lbj, ubj, lb, ub;
lbi = set1.ELEMENTS[0];
ubi = set1.ELEMENTS[1];
lbj = set2.ELEMENTS[0];
ubj = set2.ELEMENTS[1];
while (i < s1 && j < s2) {
if ((lbi <= lbj && lbj <= ubi) || (lbj <= lbi && lbi <= ubj)) {
lb = Math.max(lbi, lbj);
ub = Math.min(ubi, ubj);
if (s + 2 > e.length) {
// overflow-conscious code
int oldCapacity = e.length;
int newCapacity = oldCapacity + (oldCapacity >> 1);
if (newCapacity < s + 2)
newCapacity = s + 2;
// minCapacity is usually close to size, so this is a win:
e = Arrays.copyOf(e, newCapacity);
}
e[s++] = lb;
e[s++] = ub;
c += ub - lb + 1;
change = true;
}
if (ubi <= ubj && ++i < s1) {
lbi = set1.ELEMENTS[i << 1];
ubi = set1.ELEMENTS[(i << 1) + 1];
}else if (ubj <= ubi && ++j < s2) {
lbj = set2.ELEMENTS[j << 1];
ubj = set2.ELEMENTS[(j << 1) + 1];
}
}
set1.ELEMENTS = e;
set1.SIZE = s;
change |= (set1.CARDINALITY != c);
set1.CARDINALITY = c;
}else{
change = set1.CARDINALITY > 0;
set1.clear();
}
return change;
}
/**
* @param set1 a set of ints
* @param set2 a set of ints
* @return return a set = set1 ∪ set2
*/
public static IntIterableRangeSet union(IntIterableRangeSet set1, IntIterableRangeSet set2) {
IntIterableRangeSet t = new IntIterableRangeSet();
union(t, set1, set2);
return t;
}
/**
* Set setr to set1 ∪ set2
*
* @param setr set of ints
* @param set1 a set of ints
* @param set2 a set of ints
*/
@SuppressWarnings("Duplicates")
public static void union(IntIterableRangeSet setr, IntIterableRangeSet set1, IntIterableRangeSet set2) {
setr.clear();
int s1 = set1.SIZE >> 1;
int s2 = set2.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
setr.grow(set1.SIZE);
int i = 0, j = 0;
int lbi, ubi, lbj, ubj, lb, ub;
lb = lbi = set1.ELEMENTS[0];
ub = ubi = set1.ELEMENTS[1];
lbj = set2.ELEMENTS[0];
ubj = set2.ELEMENTS[1];
if(lb > lbj){
lb = lbj;
ub = ubj;
}
boolean extend;
while (i < s1 || j < s2) {
extend = false;
if (lb - 1 <= lbi && lbi <= ub + 1) {
ub = Math.max(ub, ubi);
extend = i < s1;
if(++i < s1){
lbi = set1.ELEMENTS[i << 1];
ubi = set1.ELEMENTS[(i << 1) + 1];
}
}
if (lb - 1 <= lbj && lbj <= ub + 1) {
ub = Math.max(ub, ubj);
extend |= j < s2;
if(++j < s2){
lbj = set2.ELEMENTS[j << 1];
ubj = set2.ELEMENTS[(j << 1) + 1];
}
}
if(!extend){
setr.pushRange(lb, ub);
if(i < s1) {
lb = lbi;
ub = ubi;
if(j < s2 && lbi > lbj){
lb = lbj;
ub = ubj;
}
}else if(j < s2){
lb = lbj;
ub = ubj;
}
}
}
setr.pushRange(lb, ub);
}
}
/**
* Set set1 to set1 ∩ set2
*
* @param set1 a set of ints
* @param set2 a set of ints
* @return true if set1 has changed
*/
@SuppressWarnings("Duplicates")
public static boolean unionOf(IntIterableRangeSet set1, IntIterableRangeSet set2) {
boolean change = false;
int s1 = set1.SIZE >> 1;
int s2 = set2.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
int i = 0, j = 0;
int s = 0, c = 0;
int[] e = new int[set1.SIZE];
int lbi, ubi, lbj, ubj, lb, ub;
lb = lbi = set1.ELEMENTS[0];
ub = ubi = set1.ELEMENTS[1];
lbj = set2.ELEMENTS[0];
ubj = set2.ELEMENTS[1];
if (lb > lbj) {
lb = lbj;
ub = ubj;
}
boolean extend;
while (i < s1 || j < s2) {
extend = false;
if (lb - 1 <= lbi && lbi <= ub + 1) {
ub = Math.max(ub, ubi);
extend = i < s1;
if (++i < s1) {
lbi = set1.ELEMENTS[i << 1];
ubi = set1.ELEMENTS[(i << 1) + 1];
}
}
if (lb - 1 <= lbj && lbj <= ub + 1) {
ub = Math.max(ub, ubj);
extend |= j < s2;
if (++j < s2) {
lbj = set2.ELEMENTS[j << 1];
ubj = set2.ELEMENTS[(j << 1) + 1];
}
}
if (!extend) {
if (s + 2 > e.length) {
// overflow-conscious code
int oldCapacity = e.length;
int newCapacity = oldCapacity + (oldCapacity >> 1);
if (newCapacity < s + 2)
newCapacity = s + 2;
// minCapacity is usually close to size, so this is a win:
e = Arrays.copyOf(e, newCapacity);
}
e[s++] = lb;
e[s++] = ub;
c += ub - lb + 1;
if (i < s1) {
lb = lbi;
ub = ubi;
if (j < s2 && lbi > lbj) {
lb = lbj;
ub = ubj;
}
} else if (j < s2) {
lb = lbj;
ub = ubj;
}
}
}
if (s + 2 > e.length) {
// overflow-conscious code
int oldCapacity = e.length;
int newCapacity = oldCapacity + (oldCapacity >> 1);
if (newCapacity < s + 2)
newCapacity = s + 2;
// minCapacity is usually close to size, so this is a win:
e = Arrays.copyOf(e, newCapacity);
}
e[s++] = lb;
e[s++] = ub;
c += ub - lb + 1;
set1.ELEMENTS = e;
set1.SIZE = s;
change = (set1.CARDINALITY != c);
set1.CARDINALITY = c;
} else {
if(s2 > 0){
set1.grow(set2.SIZE);
System.arraycopy(set2.ELEMENTS, 0, set1.ELEMENTS, 0, set2.SIZE);
set1.SIZE = set2.SIZE;
set1.CARDINALITY = set2.CARDINALITY;
change = true;
}
}
return change;
}
/**
* Put all value of var into set.
* TODO: more efficient operation
*
* @param set a set of ints
* @param var a integer variable
*/
public static void union(IntIterableRangeSet set, IntVar var) {
int ub = var.getUB();
for (int v = var.getLB(); v <= ub; v = var.nextValue(v)) {
set.add(v);
}
}
/**
* @param var a variable
* @param set a set
* @return true if var is included into set,
* false otherwise.
*/
@SuppressWarnings("Duplicates")
public static boolean includedIn(IntVar var, IntIterableRangeSet set) {
int s1 = var.getDomainSize();
int s2 = set.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
int j = 0;
int lbi, ubi, lbj, ubj;
lbi = var.getLB();
ubi = var.nextValueOut(lbi) - 1;
lbj = set.ELEMENTS[0];
ubj = set.ELEMENTS[1];
while (lbi < Integer.MAX_VALUE && j < s2) {
if (ubj < lbi && ++j < s2) {
lbj = set.ELEMENTS[j << 1];
ubj = set.ELEMENTS[(j << 1) + 1];
}else if(lbj <= lbi && ubi <= ubj){
if((lbi = var.nextValue(ubi)) < Integer.MAX_VALUE) {
ubi = var.nextValueOut(lbi) - 1;
}
}else{
return false;
}
}
}
return s2 > 0;
}
/**
* @param set1 a set
* @param set2 a set
* @return true if set1 is included into set2,
* false otherwise.
*/
@SuppressWarnings("Duplicates")
public static boolean includedIn(IntIterableRangeSet set1, IntIterableRangeSet set2) {
int s1 = set1.SIZE >> 1;
int s2 = set2.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
int i = 0, j = 0;
int lbi, ubi, lbj, ubj;
lbi = set1.ELEMENTS[0];
ubi = set1.ELEMENTS[1];
lbj = set2.ELEMENTS[0];
ubj = set2.ELEMENTS[1];
while (i < s1 && j < s2) {
if (ubj < lbi && ++j < s2) {
lbj = set2.ELEMENTS[j << 1];
ubj = set2.ELEMENTS[(j << 1) + 1];
}else if (lbj <= lbi && ubi <= ubj) {
if(++i < s1) {
lbi = set1.ELEMENTS[i << 1];
ubi = set1.ELEMENTS[(i << 1) + 1];
}
}else{
return false;
}
}
}
return s2 > 0;
}
/**
* @param var a variable
* @param set a set
* @return true if var is not included into set,
* false otherwise.
*/
@SuppressWarnings("Duplicates")
public static boolean notIncludedIn(IntVar var, IntIterableRangeSet set) {
int s1 = var.getDomainSize();
int s2 = set.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
DisposableRangeIterator rit = var.getRangeIterator(true);
int j = 0;
int lbi, ubi, lbj, ubj;
lbi = rit.min();
ubi = rit.max();
rit.next();
lbj = set.ELEMENTS[0];
ubj = set.ELEMENTS[1];
while (rit.hasNext() && j < s2) {
if ((lbi <= lbj && lbj <= ubi) || (lbj <= lbi && lbi <= ubj)) {
rit.dispose();
return true;
}
if (ubi <= ubj && rit.hasNext()) {
lbi = rit.min();
ubi = rit.max();
rit.next();
}else if (ubj <= ubi && ++j < s2) {
lbj = set.ELEMENTS[j << 1];
ubj = set.ELEMENTS[(j << 1) + 1];
}
}
rit.dispose();
}
return false;
}
/**
* @param var a variable
* @param set a set
* @return true if intersection of var and set is not empty,
* false otherwise.
*/
@SuppressWarnings("Duplicates")
public static boolean intersect(IntVar var, IntIterableRangeSet set) {
int s1 = var.getDomainSize();
int s2 = set.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
int j = 0;
int lbi, ubi, lbj, ubj;
lbi = var.getLB();
ubi = var.nextValueOut(lbi) - 1;
lbj = set.ELEMENTS[0];
ubj = set.ELEMENTS[1];
while (lbi < Integer.MAX_VALUE && j < s2) {
if ((lbi <= lbj && lbj <= ubi) || (lbj <= lbi && lbi <= ubj)) {
return true;
}
if (ubi <= ubj && (lbi = var.nextValue(ubi)) < Integer.MAX_VALUE) {
ubi = var.nextValueOut(lbi) - 1;
}else if (ubj <= ubi && ++j < s2) {
lbj = set.ELEMENTS[j << 1];
ubj = set.ELEMENTS[(j << 1) + 1];
}
}
}
return false;
}
/**
* @param set1 a set
* @param set2 a set
* @return true if intersection of set1 and set2 is not empty,
* false otherwise.
*/
@SuppressWarnings("Duplicates")
public static boolean intersect(IntIterableRangeSet set1, IntIterableRangeSet set2) {
int s1 = set1.SIZE >> 1;
int s2 = set2.SIZE >> 1;
if (s1 > 0 && s2 > 0) {
int i = 0, j = 0;
int lbi, ubi, lbj, ubj;
lbi = set1.ELEMENTS[0];
ubi = set1.ELEMENTS[1];
lbj = set2.ELEMENTS[0];
ubj = set2.ELEMENTS[1];
while (i < s1 && j < s2) {
if ((lbi <= lbj && lbj <= ubi) || (lbj <= lbi && lbi <= ubj)) {
return true;
}
if (ubi <= ubj && ++i < s1) {
lbi = set1.ELEMENTS[i << 1];
ubi = set1.ELEMENTS[(i << 1) + 1];
}else if (ubj <= ubi && ++j < s2) {
lbj = set2.ELEMENTS[j << 1];
ubj = set2.ELEMENTS[(j << 1) + 1];
}
}
}
return false;
}
}