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Commit3804bca

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168 (1) recursive decimal
1 parent0d86a64 commit3804bca

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4 files changed

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4 files changed

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/**
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***************************************************************************
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* Description:
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*
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* Given two integers representing the numerator and denominator of a fraction,
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* return the fraction in string format.
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*
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* If the fractional part is repeating, enclose the repeating part in parentheses.
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*
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* For example,
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*
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* Given numerator = 1, denominator = 2, return "0.5".
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* Given numerator = 2, denominator = 1, return "2".
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* Given numerator = 2, denominator = 3, return "0.(6)".
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*
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***************************************************************************
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* @tag : Hash Table; Math
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* {@link https://leetcode.com/problems/fraction-to-recurring-decimal/ }
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*/
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package_166_FractionToRecurringDecimal;
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/** see test {@link _166_FractionToRecurringDecimal.PracticeTest } */
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publicclassPractice {
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publicStringfractionToDecimal(intnumerator,intdenominator) {
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// TODO Auto-generated method stub
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returnnull;
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}
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}
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/**
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* Time : O() ; Space: O()
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* @tag : Hash Table; Math
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* @by : Steven Cooks
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* @date: Sep 27, 2015
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***************************************************************************
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* Description:
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*
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* Given two integers representing the numerator and denominator of a fraction,
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* return the fraction in string format.
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*
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* If the fractional part is repeating, enclose the repeating part in parentheses.
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*
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* For example,
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*
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* Given numerator = 1, denominator = 2, return "0.5".
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* Given numerator = 2, denominator = 1, return "2".
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* Given numerator = 2, denominator = 3, return "0.(6)".
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*
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***************************************************************************
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* {@link https://leetcode.com/problems/fraction-to-recurring-decimal/ }
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* 1. big integer : stack overflow issue
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*/
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package_166_FractionToRecurringDecimal;
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importjava.util.HashMap;
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importjava.util.Map;
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/** see test {@link _166_FractionToRecurringDecimal.SolutionTest } */
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publicclassSolution {
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publicStringfractionToDecimal(intnumerator,intdenominator) {
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if (denominator ==0) {
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return"";
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}
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if (numerator ==0) {
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return"0";
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}
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StringBuildersb =newStringBuilder();
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if ((numerator >0 &&denominator <0) || (numerator <0 &&denominator >0)) {
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sb.append("-");
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}
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longnum =Math.abs((long)numerator);
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longden =Math.abs((long)denominator);
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// integral part
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sb.append(num /den);
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if (num %den ==0) {
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returnsb.toString();
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}
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sb.append(".");
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// decimal part
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num =num %den *10;
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Map<Long,Integer>index =newHashMap<>();
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intrecur = -1;
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while (num !=0) {
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if (index.containsKey(num)) {
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recur =index.get(num);
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break;
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}
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index.put(num,sb.length());
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sb.append(num /den);
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num =num %den *10;
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}
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if (recur != -1) {
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sb.insert(recur,"(");
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sb.append(")");
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}
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returnsb.toString();
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}
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}
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package_166_FractionToRecurringDecimal;
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importstaticorg.junit.Assert.*;
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importorg.junit.After;
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importorg.junit.Before;
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importorg.junit.Rule;
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importorg.junit.Test;
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importorg.junit.rules.Timeout;
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publicclassPracticeTest {
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/** Test method for {@link _166_FractionToRecurringDecimal.Practice } */
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Practicesolution;
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@Rule
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publicTimeoutglobalTimeout =newTimeout(200);
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@Before
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publicvoidsetUp()throwsException {
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solution =newPractice();
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}
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@After
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publicvoidtearDown()throwsException {
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solution =null;
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}
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@Test
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publicvoidTest1() {
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intnumerator =1;
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intdenominator =2;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="0.5";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest2() {
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intnumerator =2;
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intdenominator =1;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="2";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest3() {
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intnumerator =2;
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intdenominator =3;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="0.(6)";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest4() {
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intnumerator =1;
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intdenominator =3;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="0.(3)";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest5() {
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intnumerator =1;
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intdenominator =4;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="0.25";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest6() {
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intnumerator =0;
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intdenominator =4;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="0";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest7() {
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intnumerator =1;
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intdenominator =99;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="0.(01)";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest8() {
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intnumerator =1;
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intdenominator =999;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="0.(001)";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest9() {
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intnumerator =199;
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intdenominator =99;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="2.(01)";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest10() {
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intnumerator =4000;
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intdenominator =4;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="1000";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest11() {
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intnumerator =240;
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intdenominator =4;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="60";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest12() {
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intnumerator =1001;
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intdenominator =10;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="100.1";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest13() {
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intnumerator = -1;
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intdenominator =10;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="-0.1";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest14() {
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intnumerator = -1;
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intdenominator = -2147483648;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="0.0000000004656612873077392578125";
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assertEquals(expected,actual);
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}
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@Test
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publicvoidTest15() {
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intnumerator = -2147483648;
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intdenominator = -1;
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Stringactual =solution.fractionToDecimal(numerator,denominator);
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Stringexpected ="2147483648";
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assertEquals(expected,actual);
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}
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}

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