changed error handling
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Hubert Tylkowski
parent
7522756ff9
commit
8175042b4a
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3
02-Wielomiany/src/META-INF/MANIFEST.MF
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3
02-Wielomiany/src/META-INF/MANIFEST.MF
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@ -0,0 +1,3 @@
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Manifest-Version: 1.0
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Main-Class: Main
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@ -4,8 +4,7 @@ import java.util.List;
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public class Main {
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public static void main(String[] args) throws DivisionErrorException, MultiplierNotFoundException {
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//ex input in run console : 2 "1 1 1 0 1" "0 1 1"
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public static void main(String[] args){
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int n = Integer.parseInt(args[0]);
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List<Integer> firstPolynomial = new ArrayList<>();
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args[1] = args[1].substring(1, args[1].length()-1);
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@ -14,6 +13,11 @@ public class Main {
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List<Integer> secondPolynomial = new ArrayList<>();
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Arrays.asList(args[2].split(",\\s*" )).forEach(factor -> secondPolynomial.add(Integer.valueOf(factor)));
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PolynomialTask polynomialTask = new PolynomialTask(n, firstPolynomial, secondPolynomial);
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polynomialTask.printAllValuesToStandardOutput();
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System.out.print("[");
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System.out.print(polynomialTask.printMultipliedPoly()
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+ ", " + polynomialTask.printSubtractedPoly()
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+ ", " + polynomialTask.printGcd());
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System.out.print("]");
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}
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}
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@ -1,134 +1,150 @@
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.stream.Collectors;
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public class PolynomialTask {
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private int n;
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private List<Integer> firstPolynomial;
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private List<Integer> secondPolynomial;
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private int[] firstPolynomialAsArray;
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private int[] secondPolynomialAsArray;
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public PolynomialTask(int n, List<Integer> firstPoly, List<Integer> secondPoly) {
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this.n = n;
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this.firstPolynomial = firstPoly;
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this.secondPolynomial = secondPoly;
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this.firstPolynomialAsArray = parseListToArray(firstPoly);
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this.secondPolynomialAsArray = parseListToArray(secondPoly);
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}
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public Integer[] multiplyPolynomials(List<Integer> firstPolynomial, List<Integer> secondPolynomial) {
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int[] multiplied = new int[firstPolynomial.size() + secondPolynomial.size() - 1];
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int sizeOfFirstPoly = firstPolynomial.size();
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int sizeOfSecondPoly = secondPolynomial.size();
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private int[] parseListToArray(List<Integer> polynomial) {
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int[] result = new int[polynomial.size()];
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for (int i = 0; i < polynomial.size(); i++) {
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result[i] = polynomial.get(i);
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}
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return result;
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}
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private int[] multiplyPolynomials(int[] firstPolynomial, int[] secondPolynomial) {
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int[] multiplied = new int[firstPolynomial.length + secondPolynomial.length - 1];
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int sizeOfFirstPoly = firstPolynomial.length;
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int sizeOfSecondPoly = secondPolynomial.length;
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for (int i = 0; i < sizeOfFirstPoly; i++) {
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for (int j = 0; j < sizeOfSecondPoly; j++)
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multiplied[i + j] = (multiplied[i + j] + (firstPolynomial.get(i) * secondPolynomial.get(j))) % n;
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multiplied[i + j] = (multiplied[i + j] + (firstPolynomial[i] * secondPolynomial[j])) % n;
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}
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return Arrays.stream(multiplied).boxed().toArray(Integer[]::new);
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return multiplied;
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}
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public int[] moduloDividePolynomialsReturnQuotient(List<Integer> firstPoly, List<Integer> secondPoly) throws MultiplierNotFoundException, DivisionErrorException {
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int[] quotient = new int[firstPoly.size() + secondPoly.size()];
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int firstPolyDegree = firstPoly.size() - 1;
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int secondPolyDegree = secondPoly.size() - 1;
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List<Integer> polynomialAfterSubtract = firstPoly;
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while (firstPolyDegree >= secondPolyDegree) {
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polynomialAfterSubtract = calcQuotient(polynomialAfterSubtract, secondPoly, quotient);
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firstPolyDegree = polynomialAfterSubtract.size() - 1;
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private int[] polyDiv(int[] polyOne, int[] polyTwo) {
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if (polyOne.length < polyTwo.length) {
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return null;
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}
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int[] remainder = new int[polynomialAfterSubtract.size()];
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for (int i = 0; i < polynomialAfterSubtract.size(); i++) {
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remainder[i] = polynomialAfterSubtract.get(i);
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int firstPolyDeg = polyOne.length - 1;
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int secondPolyDeg = polyTwo.length - 1;
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int[] tempArr = new int[polyOne.length];
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int[] result;
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fillTemporaryArray(polyTwo, tempArr);
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int tempMultiplier;
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int shift = 0;
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while (firstPolyDeg >= secondPolyDeg) {
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parseNegativeElement(polyOne, firstPolyDeg);
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tempMultiplier = findMultiplier(polyOne[firstPolyDeg], polyTwo[secondPolyDeg]);
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tempArr = shiftValuesInArray(tempArr, shift);
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tempArr = multiplyPolyByNumber(tempArr, tempMultiplier);
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tempArr = moduloArray(tempArr);
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polyOne = subtractTwoPolynomials(polyOne, tempArr);
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firstPolyDeg--;
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shift++;
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}
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return remainder;
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result = Arrays.copyOf(polyOne, shift - 1);
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return result;
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}
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private List<Integer> calcQuotient(List<Integer> firstPoly, List<Integer> secondPoly, int[] quotient) throws MultiplierNotFoundException, DivisionErrorException {
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int firstPolyDegree = firstPoly.size() - 1;
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int secondPolyDegree = secondPoly.size() - 1;
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if (firstPolyDegree < secondPolyDegree) {
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throw new DivisionErrorException();
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private void fillTemporaryArray(int[] polyTwo, int[] tempArr) {
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for (int i = 0; i < polyTwo.length; i++) {
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tempArr[tempArr.length - 1 - i] = polyTwo[polyTwo.length - 1 - i];
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}
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int quotientCoefficient;
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if ((((float) firstPoly.get(firstPolyDegree) / (float) secondPoly.get(secondPolyDegree))) == Math.round(firstPoly.get(firstPolyDegree) / secondPoly.get(secondPolyDegree))) {
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quotientCoefficient = firstPoly.get(firstPolyDegree) / secondPoly.get(secondPolyDegree);
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} else {
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quotientCoefficient = invElem(firstPoly.get(firstPolyDegree), secondPoly.get(secondPolyDegree));
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}
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quotient[firstPolyDegree - secondPolyDegree] += quotientCoefficient;
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List<Integer> newPoly = generatePolyFromIndexAndValue(firstPolyDegree - secondPolyDegree, quotientCoefficient);
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Integer[] multipliedPolynomials = multiplyPolynomials(newPoly, secondPoly);
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List<Integer> polynomialAfterFirstDivide = new ArrayList<>(Arrays.asList(multipliedPolynomials));
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return removeUnnecessaryZeros(subtractTwoPolynomials(firstPoly, polynomialAfterFirstDivide));
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}
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private List<Integer> removeUnnecessaryZeros(List<Integer> polynomialAfterSubtract) {
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int amountOfZeros = 0;
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for (int i = polynomialAfterSubtract.size() - 1; i >= 0; i--) {
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if (polynomialAfterSubtract.get(i) == 0) {
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amountOfZeros++;
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} else {
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break;
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}
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private int[] subtractTwoPolynomials(int[] polyOne, int[] polyTwo) {
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int[] result = new int[polyOne.length];
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for (int i = 0; i < polyOne.length; i++) {
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result[i] = polyOne[i] - polyTwo[i];
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}
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polynomialAfterSubtract = polynomialAfterSubtract.subList(0, polynomialAfterSubtract.size() - amountOfZeros);
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return polynomialAfterSubtract;
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return result;
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}
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private List<Integer> subtractTwoPolynomials(List<Integer> firstPoly, List<Integer> secondPoly) {
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List<Integer> subtractedPolynomial = new ArrayList<>(Collections.nCopies(firstPoly.size() + secondPoly.size(), 0));
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for (int index = firstPoly.size(); index >= 0; index--) {
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if (index < secondPoly.size()) {
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subtractedPolynomial.set(index, firstPoly.get(index) - secondPoly.get(index));
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parseNegativeElement(subtractedPolynomial, index);
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}
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private int[] moduloArray(int[] array) {
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for (int i = 0; i < array.length; i++) {
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array[i] = array[i] % n;
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}
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return subtractedPolynomial;
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return array;
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}
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private void parseNegativeElement(List<Integer> subtractedPolynomial, int index) {
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while (subtractedPolynomial.get(index) < 0)
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subtractedPolynomial.set(index, (subtractedPolynomial.get(index) * subtractedPolynomial.get(index)) % n);
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}
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private List<Integer> generatePolyFromIndexAndValue(int size, int quotientCoefficient) {
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List<Integer> poly = new ArrayList<>(Collections.nCopies(size + 1, 0));
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poly.set(size, quotientCoefficient);
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private int[] multiplyPolyByNumber(int[] poly, int multiplier) {
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for (int i = 0; i < poly.length; i++) {
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poly[i] = poly[i] * multiplier;
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}
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return poly;
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}
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private int invElem(int a, int b) throws MultiplierNotFoundException {
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private int[] shiftValuesInArray(int[] array, int amount) {
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if (amount == 0) {
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return array;
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} else {
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int[] res = new int[array.length];
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System.arraycopy(array, amount, res, 0, array.length - amount);
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for (int j = array.length - amount + 1; j < res.length; j++) {
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res[j] = 0;
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}
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return res;
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}
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}
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private void parseNegativeElement(int[] polyOne, int firstPolyDeg) {
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while (polyOne[firstPolyDeg] < 0) {
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polyOne[firstPolyDeg] = n + polyOne[firstPolyDeg];
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}
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}
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private int findMultiplier(int a, int b) {
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for (int i = 0; i < n; i++) {
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if (a == (b * i) % n) {
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return i;
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}
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}
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throw new MultiplierNotFoundException();
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return -1;
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}
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public void printAllValuesToStandardOutput() throws DivisionErrorException, MultiplierNotFoundException {
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List<List<Integer>> values = new ArrayList<>();
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values.add(Arrays.asList(multiplyPolynomials(firstPolynomial, secondPolynomial)));
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values.add(Arrays.stream(moduloDividePolynomialsReturnQuotient(firstPolynomial, secondPolynomial)).boxed().collect(Collectors.toList()));
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try {
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values.add(gcd(firstPolynomial, secondPolynomial));
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} catch (MultiplierNotFoundException e) {
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public String printMultipliedPoly() {
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return Arrays.toString(multiplyPolynomials(firstPolynomialAsArray, secondPolynomialAsArray));
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}
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public String printSubtractedPoly() {
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int[] result = polyDiv(firstPolynomialAsArray, secondPolynomialAsArray);
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if (result == null) {
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return "Division Error";
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} else if (result.length == 0) {
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return "[0]";
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} else {
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return Arrays.toString(polyDiv(firstPolynomialAsArray, secondPolynomialAsArray));
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}
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System.out.println(values);
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}
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private List<Integer> gcd(List<Integer> polyOne, List<Integer> polyTwo) throws MultiplierNotFoundException, DivisionErrorException {
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if (polyTwo.isEmpty()) return polyOne;
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List<Integer> poly = Arrays.stream(moduloDividePolynomialsReturnQuotient(polyOne, polyTwo)).boxed().collect(Collectors.toList());
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return gcd(polyTwo, poly);
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public String printGcd() {
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int[] gcd = gcd(firstPolynomialAsArray, secondPolynomialAsArray);
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if (gcd == null) {
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return "Division Error";
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} else
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return Arrays.toString(gcd);
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}
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private int[] gcd(int[] firstPoly, int[] secondPoly) {
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if (secondPoly.length == 0) {
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return firstPoly;
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}
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if (firstPoly.length >= secondPoly.length) {
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return gcd(secondPoly, polyDiv(firstPoly, secondPoly));
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} else {
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return gcd(secondPoly, polyDiv(secondPoly, firstPoly));
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}
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}
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}
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