get combinations of sets created after combinations in java












0















I've come to a dead end and need your help!!
I've managed to get combinations of a list of numbers(Double) that give a specific sum.I also have a hashtable which values are the numbers of the previous list and keys are some Strings eg. numbers(Double)[2.45,2.65,4.67,5.25,2.45,2.65....] and table[(E-40=2.45),(E-45=2.45),(E-56=2.65),(E-34=2.65),(E-24=4.67),(E-14=5.25)....].So after the numbers combinations for a specific sum I get: For sum: 5.10 ---> 2.45 - 2.65 which corresponds to (E-40,E-45) - (E-56,E-34).I would like to get now the combinations of these sets.



eg
[(E-40)-(E-56)],[(E-40)-(E-34)],
[(E-45)-(E-56)],[(E-45)-(E-34)]
And here is my code:`



public class TestTheCombinations {

public static void main(String args) {
ArrayList<Double> numbers = new ArrayList<>(Arrays.asList(2.45,2.45,2.65,2.65,4.67,5.25));
LinkedHashSet<Double> targets = new LinkedHashSet<Double>() {{
add(5.10);
}};

for (Double target: targets) {
Combinations combinations = new Combinations(numbers, target, false);
combinations.calculateCombinations();
for (String solution: combinations.getCombinations()) {
System.out.println(solution);
}
}
}
public static class Combinations {
private boolean allowRepetitions;
private int repetitions;
private ArrayList<Double> numbers;
private Hashtable<String,Double> table;
private Double target;
private Double sum;
private boolean hasNext;
private Set<String> combinations;
/**
* Constructor.
*
* @param numbers Numbers that can be used to calculate the sum.
* @param target Target value for sum.
*/
public Combinations(ArrayList<Double> numbers, Double target) {
this(numbers, target, true);
}

/**
* Constructor.
*
* @param numbers Numbers that can be used to calculate the sum.
* @param target Target value for sum.
*/
public Combinations(ArrayList<Double> numbers, Double target, boolean allowRepetitions) {
this.allowRepetitions = allowRepetitions;
if (this.allowRepetitions) {
Set<Double> numbersSet = new HashSet<>(numbers);
this.numbers = new ArrayList<>(numbersSet);
} else {
this.numbers = numbers;
}
this.numbers.removeAll(Arrays.asList(0));
Collections.sort(this.numbers);

this.target = target;
this.repetitions = new int[this.numbers.size()];
this.combinations = new LinkedHashSet<>();

this.sum = 0.0;
if (this.repetitions.length > 0)
this.hasNext = true;
else
this.hasNext = false;
}

/**
* Calculate and return the sum of the current combination.
*
* @return The sum.
*/
private Double calculateSum() {
this.sum = 0.0;
for (int i = 0; i < repetitions.length; ++i) {
this.sum += repetitions[i] * numbers.get(i);

}

return this.sum;
}

/**
* Redistribute picks when only one of each number is allowed in the sum.
*/
private void redistribute() {
for (int i = 1; i < this.repetitions.length; ++i) {
if (this.repetitions[i - 1] > 1) {
this.repetitions[i - 1] = 0;
this.repetitions[i] += 1;
}
}
if (this.repetitions[this.repetitions.length - 1] > 1)
this.repetitions[this.repetitions.length - 1] = 0;
}

/**
* Get the sum of the next combination. When 0 is returned, there's no other combinations to check.
*
* @return The sum.
*/
private Double next() {
if (this.hasNext && this.repetitions.length > 0) {
this.repetitions[0] += 1;
if (!this.allowRepetitions)
this.redistribute();
this.calculateSum();

for (int i = 0; i < this.repetitions.length && this.sum != 0; ++i) {
if (this.sum > this.target) {
this.repetitions[i] = 0;
if (i + 1 < this.repetitions.length) {
this.repetitions[i + 1] += 1;
if (!this.allowRepetitions)
this.redistribute();
}
this.calculateSum();
}
}

if (this.sum.compareTo(0.0) == 0.0)
this.hasNext = false;
}
return this.sum;
}

/**
* Calculate all combinations whose sum equals target.
*/
public void calculateCombinations() {
while (this.hasNext) {
if (this.next().compareTo(target) == 0)
this.combinations.add(this.toString());
}
}

/**
* Return all combinations whose sum equals target.
*
* @return Combinations as a set of strings.
*/
public Set<String> getCombinations() {
return this.combinations;
}

@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public String toString() {

Hashtable<String,Double> table = new Hashtable<String,Double>();
table.put("E-40",2.45);
table.put("E-45",2.45);
table.put("E-56",2.65);
table.put("E-34",2.65);
table.put("E-24",4.67);
table.put("E-14",5.25);

StringBuilder stringBuilder = new StringBuilder("For SUM " + sum + ": "+"n");
StringBuilder stringBuilder2 = new StringBuilder();

for (int i = 0; i < repetitions.length; ++i) {

for (int j = 0; j < repetitions[i]; ++j) {
Set keys = new HashSet();
Double value = numbers.get(i);
for(Map.Entry entry: table.entrySet()){
if(value.equals(entry.getValue())){
keys.add(entry.getKey());
}

}
stringBuilder.append(numbers.get(i)+ " Corresponds WorkCode "+ keys+"n");

}

}
return stringBuilder.toString() ;

}

}



}


`



Thanks for any help!!!










share|improve this question

























  • When you write “5.10 ---> 2.45 - 2.65”, you mean + right, as in 2.45 + 2.65 = 5.10? Could you also explain what the issue is with your current code, what part of it do you want help with?

    – Joakim Danielson
    Jan 19 at 12:17













  • Yes I mean "+" I wrote "-" to seperate the two values.The code as far has no problem,but I need to add code to get extra combinations for the created sets"keys" which are in a loop

    – arctu
    Jan 19 at 12:27













  • If you use Guava, you can take a look at this method: google.github.io/guava/releases/snapshot/api/docs/com/google/…

    – Babyburger
    Jan 19 at 12:50
















0















I've come to a dead end and need your help!!
I've managed to get combinations of a list of numbers(Double) that give a specific sum.I also have a hashtable which values are the numbers of the previous list and keys are some Strings eg. numbers(Double)[2.45,2.65,4.67,5.25,2.45,2.65....] and table[(E-40=2.45),(E-45=2.45),(E-56=2.65),(E-34=2.65),(E-24=4.67),(E-14=5.25)....].So after the numbers combinations for a specific sum I get: For sum: 5.10 ---> 2.45 - 2.65 which corresponds to (E-40,E-45) - (E-56,E-34).I would like to get now the combinations of these sets.



eg
[(E-40)-(E-56)],[(E-40)-(E-34)],
[(E-45)-(E-56)],[(E-45)-(E-34)]
And here is my code:`



public class TestTheCombinations {

public static void main(String args) {
ArrayList<Double> numbers = new ArrayList<>(Arrays.asList(2.45,2.45,2.65,2.65,4.67,5.25));
LinkedHashSet<Double> targets = new LinkedHashSet<Double>() {{
add(5.10);
}};

for (Double target: targets) {
Combinations combinations = new Combinations(numbers, target, false);
combinations.calculateCombinations();
for (String solution: combinations.getCombinations()) {
System.out.println(solution);
}
}
}
public static class Combinations {
private boolean allowRepetitions;
private int repetitions;
private ArrayList<Double> numbers;
private Hashtable<String,Double> table;
private Double target;
private Double sum;
private boolean hasNext;
private Set<String> combinations;
/**
* Constructor.
*
* @param numbers Numbers that can be used to calculate the sum.
* @param target Target value for sum.
*/
public Combinations(ArrayList<Double> numbers, Double target) {
this(numbers, target, true);
}

/**
* Constructor.
*
* @param numbers Numbers that can be used to calculate the sum.
* @param target Target value for sum.
*/
public Combinations(ArrayList<Double> numbers, Double target, boolean allowRepetitions) {
this.allowRepetitions = allowRepetitions;
if (this.allowRepetitions) {
Set<Double> numbersSet = new HashSet<>(numbers);
this.numbers = new ArrayList<>(numbersSet);
} else {
this.numbers = numbers;
}
this.numbers.removeAll(Arrays.asList(0));
Collections.sort(this.numbers);

this.target = target;
this.repetitions = new int[this.numbers.size()];
this.combinations = new LinkedHashSet<>();

this.sum = 0.0;
if (this.repetitions.length > 0)
this.hasNext = true;
else
this.hasNext = false;
}

/**
* Calculate and return the sum of the current combination.
*
* @return The sum.
*/
private Double calculateSum() {
this.sum = 0.0;
for (int i = 0; i < repetitions.length; ++i) {
this.sum += repetitions[i] * numbers.get(i);

}

return this.sum;
}

/**
* Redistribute picks when only one of each number is allowed in the sum.
*/
private void redistribute() {
for (int i = 1; i < this.repetitions.length; ++i) {
if (this.repetitions[i - 1] > 1) {
this.repetitions[i - 1] = 0;
this.repetitions[i] += 1;
}
}
if (this.repetitions[this.repetitions.length - 1] > 1)
this.repetitions[this.repetitions.length - 1] = 0;
}

/**
* Get the sum of the next combination. When 0 is returned, there's no other combinations to check.
*
* @return The sum.
*/
private Double next() {
if (this.hasNext && this.repetitions.length > 0) {
this.repetitions[0] += 1;
if (!this.allowRepetitions)
this.redistribute();
this.calculateSum();

for (int i = 0; i < this.repetitions.length && this.sum != 0; ++i) {
if (this.sum > this.target) {
this.repetitions[i] = 0;
if (i + 1 < this.repetitions.length) {
this.repetitions[i + 1] += 1;
if (!this.allowRepetitions)
this.redistribute();
}
this.calculateSum();
}
}

if (this.sum.compareTo(0.0) == 0.0)
this.hasNext = false;
}
return this.sum;
}

/**
* Calculate all combinations whose sum equals target.
*/
public void calculateCombinations() {
while (this.hasNext) {
if (this.next().compareTo(target) == 0)
this.combinations.add(this.toString());
}
}

/**
* Return all combinations whose sum equals target.
*
* @return Combinations as a set of strings.
*/
public Set<String> getCombinations() {
return this.combinations;
}

@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public String toString() {

Hashtable<String,Double> table = new Hashtable<String,Double>();
table.put("E-40",2.45);
table.put("E-45",2.45);
table.put("E-56",2.65);
table.put("E-34",2.65);
table.put("E-24",4.67);
table.put("E-14",5.25);

StringBuilder stringBuilder = new StringBuilder("For SUM " + sum + ": "+"n");
StringBuilder stringBuilder2 = new StringBuilder();

for (int i = 0; i < repetitions.length; ++i) {

for (int j = 0; j < repetitions[i]; ++j) {
Set keys = new HashSet();
Double value = numbers.get(i);
for(Map.Entry entry: table.entrySet()){
if(value.equals(entry.getValue())){
keys.add(entry.getKey());
}

}
stringBuilder.append(numbers.get(i)+ " Corresponds WorkCode "+ keys+"n");

}

}
return stringBuilder.toString() ;

}

}



}


`



Thanks for any help!!!










share|improve this question

























  • When you write “5.10 ---> 2.45 - 2.65”, you mean + right, as in 2.45 + 2.65 = 5.10? Could you also explain what the issue is with your current code, what part of it do you want help with?

    – Joakim Danielson
    Jan 19 at 12:17













  • Yes I mean "+" I wrote "-" to seperate the two values.The code as far has no problem,but I need to add code to get extra combinations for the created sets"keys" which are in a loop

    – arctu
    Jan 19 at 12:27













  • If you use Guava, you can take a look at this method: google.github.io/guava/releases/snapshot/api/docs/com/google/…

    – Babyburger
    Jan 19 at 12:50














0












0








0








I've come to a dead end and need your help!!
I've managed to get combinations of a list of numbers(Double) that give a specific sum.I also have a hashtable which values are the numbers of the previous list and keys are some Strings eg. numbers(Double)[2.45,2.65,4.67,5.25,2.45,2.65....] and table[(E-40=2.45),(E-45=2.45),(E-56=2.65),(E-34=2.65),(E-24=4.67),(E-14=5.25)....].So after the numbers combinations for a specific sum I get: For sum: 5.10 ---> 2.45 - 2.65 which corresponds to (E-40,E-45) - (E-56,E-34).I would like to get now the combinations of these sets.



eg
[(E-40)-(E-56)],[(E-40)-(E-34)],
[(E-45)-(E-56)],[(E-45)-(E-34)]
And here is my code:`



public class TestTheCombinations {

public static void main(String args) {
ArrayList<Double> numbers = new ArrayList<>(Arrays.asList(2.45,2.45,2.65,2.65,4.67,5.25));
LinkedHashSet<Double> targets = new LinkedHashSet<Double>() {{
add(5.10);
}};

for (Double target: targets) {
Combinations combinations = new Combinations(numbers, target, false);
combinations.calculateCombinations();
for (String solution: combinations.getCombinations()) {
System.out.println(solution);
}
}
}
public static class Combinations {
private boolean allowRepetitions;
private int repetitions;
private ArrayList<Double> numbers;
private Hashtable<String,Double> table;
private Double target;
private Double sum;
private boolean hasNext;
private Set<String> combinations;
/**
* Constructor.
*
* @param numbers Numbers that can be used to calculate the sum.
* @param target Target value for sum.
*/
public Combinations(ArrayList<Double> numbers, Double target) {
this(numbers, target, true);
}

/**
* Constructor.
*
* @param numbers Numbers that can be used to calculate the sum.
* @param target Target value for sum.
*/
public Combinations(ArrayList<Double> numbers, Double target, boolean allowRepetitions) {
this.allowRepetitions = allowRepetitions;
if (this.allowRepetitions) {
Set<Double> numbersSet = new HashSet<>(numbers);
this.numbers = new ArrayList<>(numbersSet);
} else {
this.numbers = numbers;
}
this.numbers.removeAll(Arrays.asList(0));
Collections.sort(this.numbers);

this.target = target;
this.repetitions = new int[this.numbers.size()];
this.combinations = new LinkedHashSet<>();

this.sum = 0.0;
if (this.repetitions.length > 0)
this.hasNext = true;
else
this.hasNext = false;
}

/**
* Calculate and return the sum of the current combination.
*
* @return The sum.
*/
private Double calculateSum() {
this.sum = 0.0;
for (int i = 0; i < repetitions.length; ++i) {
this.sum += repetitions[i] * numbers.get(i);

}

return this.sum;
}

/**
* Redistribute picks when only one of each number is allowed in the sum.
*/
private void redistribute() {
for (int i = 1; i < this.repetitions.length; ++i) {
if (this.repetitions[i - 1] > 1) {
this.repetitions[i - 1] = 0;
this.repetitions[i] += 1;
}
}
if (this.repetitions[this.repetitions.length - 1] > 1)
this.repetitions[this.repetitions.length - 1] = 0;
}

/**
* Get the sum of the next combination. When 0 is returned, there's no other combinations to check.
*
* @return The sum.
*/
private Double next() {
if (this.hasNext && this.repetitions.length > 0) {
this.repetitions[0] += 1;
if (!this.allowRepetitions)
this.redistribute();
this.calculateSum();

for (int i = 0; i < this.repetitions.length && this.sum != 0; ++i) {
if (this.sum > this.target) {
this.repetitions[i] = 0;
if (i + 1 < this.repetitions.length) {
this.repetitions[i + 1] += 1;
if (!this.allowRepetitions)
this.redistribute();
}
this.calculateSum();
}
}

if (this.sum.compareTo(0.0) == 0.0)
this.hasNext = false;
}
return this.sum;
}

/**
* Calculate all combinations whose sum equals target.
*/
public void calculateCombinations() {
while (this.hasNext) {
if (this.next().compareTo(target) == 0)
this.combinations.add(this.toString());
}
}

/**
* Return all combinations whose sum equals target.
*
* @return Combinations as a set of strings.
*/
public Set<String> getCombinations() {
return this.combinations;
}

@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public String toString() {

Hashtable<String,Double> table = new Hashtable<String,Double>();
table.put("E-40",2.45);
table.put("E-45",2.45);
table.put("E-56",2.65);
table.put("E-34",2.65);
table.put("E-24",4.67);
table.put("E-14",5.25);

StringBuilder stringBuilder = new StringBuilder("For SUM " + sum + ": "+"n");
StringBuilder stringBuilder2 = new StringBuilder();

for (int i = 0; i < repetitions.length; ++i) {

for (int j = 0; j < repetitions[i]; ++j) {
Set keys = new HashSet();
Double value = numbers.get(i);
for(Map.Entry entry: table.entrySet()){
if(value.equals(entry.getValue())){
keys.add(entry.getKey());
}

}
stringBuilder.append(numbers.get(i)+ " Corresponds WorkCode "+ keys+"n");

}

}
return stringBuilder.toString() ;

}

}



}


`



Thanks for any help!!!










share|improve this question
















I've come to a dead end and need your help!!
I've managed to get combinations of a list of numbers(Double) that give a specific sum.I also have a hashtable which values are the numbers of the previous list and keys are some Strings eg. numbers(Double)[2.45,2.65,4.67,5.25,2.45,2.65....] and table[(E-40=2.45),(E-45=2.45),(E-56=2.65),(E-34=2.65),(E-24=4.67),(E-14=5.25)....].So after the numbers combinations for a specific sum I get: For sum: 5.10 ---> 2.45 - 2.65 which corresponds to (E-40,E-45) - (E-56,E-34).I would like to get now the combinations of these sets.



eg
[(E-40)-(E-56)],[(E-40)-(E-34)],
[(E-45)-(E-56)],[(E-45)-(E-34)]
And here is my code:`



public class TestTheCombinations {

public static void main(String args) {
ArrayList<Double> numbers = new ArrayList<>(Arrays.asList(2.45,2.45,2.65,2.65,4.67,5.25));
LinkedHashSet<Double> targets = new LinkedHashSet<Double>() {{
add(5.10);
}};

for (Double target: targets) {
Combinations combinations = new Combinations(numbers, target, false);
combinations.calculateCombinations();
for (String solution: combinations.getCombinations()) {
System.out.println(solution);
}
}
}
public static class Combinations {
private boolean allowRepetitions;
private int repetitions;
private ArrayList<Double> numbers;
private Hashtable<String,Double> table;
private Double target;
private Double sum;
private boolean hasNext;
private Set<String> combinations;
/**
* Constructor.
*
* @param numbers Numbers that can be used to calculate the sum.
* @param target Target value for sum.
*/
public Combinations(ArrayList<Double> numbers, Double target) {
this(numbers, target, true);
}

/**
* Constructor.
*
* @param numbers Numbers that can be used to calculate the sum.
* @param target Target value for sum.
*/
public Combinations(ArrayList<Double> numbers, Double target, boolean allowRepetitions) {
this.allowRepetitions = allowRepetitions;
if (this.allowRepetitions) {
Set<Double> numbersSet = new HashSet<>(numbers);
this.numbers = new ArrayList<>(numbersSet);
} else {
this.numbers = numbers;
}
this.numbers.removeAll(Arrays.asList(0));
Collections.sort(this.numbers);

this.target = target;
this.repetitions = new int[this.numbers.size()];
this.combinations = new LinkedHashSet<>();

this.sum = 0.0;
if (this.repetitions.length > 0)
this.hasNext = true;
else
this.hasNext = false;
}

/**
* Calculate and return the sum of the current combination.
*
* @return The sum.
*/
private Double calculateSum() {
this.sum = 0.0;
for (int i = 0; i < repetitions.length; ++i) {
this.sum += repetitions[i] * numbers.get(i);

}

return this.sum;
}

/**
* Redistribute picks when only one of each number is allowed in the sum.
*/
private void redistribute() {
for (int i = 1; i < this.repetitions.length; ++i) {
if (this.repetitions[i - 1] > 1) {
this.repetitions[i - 1] = 0;
this.repetitions[i] += 1;
}
}
if (this.repetitions[this.repetitions.length - 1] > 1)
this.repetitions[this.repetitions.length - 1] = 0;
}

/**
* Get the sum of the next combination. When 0 is returned, there's no other combinations to check.
*
* @return The sum.
*/
private Double next() {
if (this.hasNext && this.repetitions.length > 0) {
this.repetitions[0] += 1;
if (!this.allowRepetitions)
this.redistribute();
this.calculateSum();

for (int i = 0; i < this.repetitions.length && this.sum != 0; ++i) {
if (this.sum > this.target) {
this.repetitions[i] = 0;
if (i + 1 < this.repetitions.length) {
this.repetitions[i + 1] += 1;
if (!this.allowRepetitions)
this.redistribute();
}
this.calculateSum();
}
}

if (this.sum.compareTo(0.0) == 0.0)
this.hasNext = false;
}
return this.sum;
}

/**
* Calculate all combinations whose sum equals target.
*/
public void calculateCombinations() {
while (this.hasNext) {
if (this.next().compareTo(target) == 0)
this.combinations.add(this.toString());
}
}

/**
* Return all combinations whose sum equals target.
*
* @return Combinations as a set of strings.
*/
public Set<String> getCombinations() {
return this.combinations;
}

@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public String toString() {

Hashtable<String,Double> table = new Hashtable<String,Double>();
table.put("E-40",2.45);
table.put("E-45",2.45);
table.put("E-56",2.65);
table.put("E-34",2.65);
table.put("E-24",4.67);
table.put("E-14",5.25);

StringBuilder stringBuilder = new StringBuilder("For SUM " + sum + ": "+"n");
StringBuilder stringBuilder2 = new StringBuilder();

for (int i = 0; i < repetitions.length; ++i) {

for (int j = 0; j < repetitions[i]; ++j) {
Set keys = new HashSet();
Double value = numbers.get(i);
for(Map.Entry entry: table.entrySet()){
if(value.equals(entry.getValue())){
keys.add(entry.getKey());
}

}
stringBuilder.append(numbers.get(i)+ " Corresponds WorkCode "+ keys+"n");

}

}
return stringBuilder.toString() ;

}

}



}


`



Thanks for any help!!!







java






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jan 19 at 12:13







arctu

















asked Jan 19 at 12:03









arctuarctu

13




13













  • When you write “5.10 ---> 2.45 - 2.65”, you mean + right, as in 2.45 + 2.65 = 5.10? Could you also explain what the issue is with your current code, what part of it do you want help with?

    – Joakim Danielson
    Jan 19 at 12:17













  • Yes I mean "+" I wrote "-" to seperate the two values.The code as far has no problem,but I need to add code to get extra combinations for the created sets"keys" which are in a loop

    – arctu
    Jan 19 at 12:27













  • If you use Guava, you can take a look at this method: google.github.io/guava/releases/snapshot/api/docs/com/google/…

    – Babyburger
    Jan 19 at 12:50



















  • When you write “5.10 ---> 2.45 - 2.65”, you mean + right, as in 2.45 + 2.65 = 5.10? Could you also explain what the issue is with your current code, what part of it do you want help with?

    – Joakim Danielson
    Jan 19 at 12:17













  • Yes I mean "+" I wrote "-" to seperate the two values.The code as far has no problem,but I need to add code to get extra combinations for the created sets"keys" which are in a loop

    – arctu
    Jan 19 at 12:27













  • If you use Guava, you can take a look at this method: google.github.io/guava/releases/snapshot/api/docs/com/google/…

    – Babyburger
    Jan 19 at 12:50

















When you write “5.10 ---> 2.45 - 2.65”, you mean + right, as in 2.45 + 2.65 = 5.10? Could you also explain what the issue is with your current code, what part of it do you want help with?

– Joakim Danielson
Jan 19 at 12:17







When you write “5.10 ---> 2.45 - 2.65”, you mean + right, as in 2.45 + 2.65 = 5.10? Could you also explain what the issue is with your current code, what part of it do you want help with?

– Joakim Danielson
Jan 19 at 12:17















Yes I mean "+" I wrote "-" to seperate the two values.The code as far has no problem,but I need to add code to get extra combinations for the created sets"keys" which are in a loop

– arctu
Jan 19 at 12:27







Yes I mean "+" I wrote "-" to seperate the two values.The code as far has no problem,but I need to add code to get extra combinations for the created sets"keys" which are in a loop

– arctu
Jan 19 at 12:27















If you use Guava, you can take a look at this method: google.github.io/guava/releases/snapshot/api/docs/com/google/…

– Babyburger
Jan 19 at 12:50





If you use Guava, you can take a look at this method: google.github.io/guava/releases/snapshot/api/docs/com/google/…

– Babyburger
Jan 19 at 12:50












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