dsalgo | com Data structure and algorithms interview questions

by ppsirker Java Version: Current License: No License

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kandi X-RAY | dsalgo Summary

dsalgo is a Java library. dsalgo has no bugs, it has no vulnerabilities and it has low support. However dsalgo build file is not available. You can download it from GitHub.

www.dsalgo.com Data structure and algorithms interview questions and answers with complete java code for top level companies like google, microsoft, amazon and Facebook.

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dsalgo has a low active ecosystem.
It has 63 star(s) with 51 fork(s). There are 12 watchers for this library.
It had no major release in the last 12 months.
dsalgo has no issues reported. There are no pull requests.
It has a neutral sentiment in the developer community.
The latest version of dsalgo is current.

dsalgo Support

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Average in #Java

dsalgo Support

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quality kandi Quality

dsalgo has 0 bugs and 0 code smells.

dsalgo Quality

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dsalgo Quality

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Average in #Java

security Security

dsalgo has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
dsalgo code analysis shows 0 unresolved vulnerabilities.
There are 0 security hotspots that need review.

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dsalgo Security

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license License

dsalgo does not have a standard license declared.
Check the repository for any license declaration and review the terms closely.
Without a license, all rights are reserved, and you cannot use the library in your applications.

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dsalgo License

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build Reuse

dsalgo releases are not available. You will need to build from source code and install.
dsalgo has no build file. You will be need to create the build yourself to build the component from source.
It has 6193 lines of code, 391 functions and 106 files.
It has medium code complexity. Code complexity directly impacts maintainability of the code.

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dsalgo Reuse

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Top functions reviewed by kandi - BETA

kandi has reviewed dsalgo and discovered the below as its top functions. This is intended to give you an instant insight into dsalgo implemented functionality, and help decide if they suit your requirements.

Finds the maximum sum .

Get letters order .

returns true if the input string is a permutation

Partition an integer array .

Recursively build a list of strings .

Find the intersection between two linked lists

Find the repetition index .

Print all unique substrings .

return true if possible

Gets a list of all nodes from the tree rooted at the given root .

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dsalgo Key Features

www.dsalgo.com Data structure and algorithms interview questions and answers with complete java code for top level companies like google, microsoft, amazon and Facebook.

dsalgo Examples and Code Snippets

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Jacoco code coverage: non-existent Static block shows only 75% coverage

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static {};
  descriptor: ()V
  flags: (0x0008) ACC_STATIC
  Code:
    stack=1, locals=0, args_size=0
       0: ldc           #72                 // class ds/BrickSortParallel
       2: invokevirtual #73                 // Method java/lang/Class.desiredAssertionStatus:()Z
       5: ifne          12
       8: iconst_1
       9: goto          13
      12: iconst_0
      13: putstatic     #31                 // Field $assertionsDisabled:Z
      16: return
    LineNumberTable:
      line 19: 0
    StackMapTable: number_of_entries = 2
      frame_type = 12 /* same */
      frame_type = 64 /* same_locals_1_stack_item */
        stack = [ int ]


  @Generated
private void assertEquality(int  size, int count) {
if (size != count)
 throw new AssertionError("Size is not the same as count.");
    }

static {};
  descriptor: ()V
  flags: (0x0008) ACC_STATIC
  Code:
    stack=1, locals=0, args_size=0
       0: ldc           #72                 // class ds/BrickSortParallel
       2: invokevirtual #73                 // Method java/lang/Class.desiredAssertionStatus:()Z
       5: ifne          12
       8: iconst_1
       9: goto          13
      12: iconst_0
      13: putstatic     #31                 // Field $assertionsDisabled:Z
      16: return
    LineNumberTable:
      line 19: 0
    StackMapTable: number_of_entries = 2
      frame_type = 12 /* same */
      frame_type = 64 /* same_locals_1_stack_item */
        stack = [ int ]


  @Generated
private void assertEquality(int  size, int count) {
if (size != count)
 throw new AssertionError("Size is not the same as count.");
    }

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Jacoco code coverage: non-existent Static block shows only 75% coverage

Trending Discussions on dsalgo

QUESTION

Jacoco code coverage: non-existent Static block shows only 75% coverage

Asked 2020-Aug-26 at 12:38

I have two static methods in the class BrickSortParallel. They are fully covered by unit tests. But I have a static block static {...} listed with only 75% code coverage by Jacoco. What does that signify?

Screen shot of coverage


public static int computeOddTaskCount(int length) {
    if (length < 0) throw new IllegalArgumentException("Illegal argument value: " + length);
    return isOdd(length) ? length >> 1 : abs(length - 1) >> 1;
  }

  public static int computeEvenTaskCount(int length) {
    if (length < 0) throw new IllegalArgumentException("Illegal argument value: " + length);
    return length >> 1;
  }

Following are test cases to ensure full code coverage for above methods:

class ComputeTaskCountTest {

private static final String ZERO_TASKS_EXPECTED = "Zero tasks expected.";
  private static final String ONE_TASK_EXPECTED = "One task expected.";
  private static final String HALF_TASKS_EXPECTED = "Half tasks expected.";
  private static final String ILLEGAL_LENGTH_EXPECTED = "Illegal length expected.";

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testZeroLength")
    void testZeroLength() {
      assertEquals(0, computeOddTaskCount(0), ZERO_TASKS_EXPECTED);
      assertEquals(0, computeEvenTaskCount(0), ZERO_TASKS_EXPECTED);
    }

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testMinusOneLength")
    void testMinusOneLength() {
      assertThrows(
          IllegalArgumentException.class, () -> computeOddTaskCount(-1), ILLEGAL_LENGTH_EXPECTED);
      assertThrows(
          IllegalArgumentException.class, () -> computeEvenTaskCount(-1), ILLEGAL_LENGTH_EXPECTED);
    }

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testMinusTwoLength")
    void testMinusTwoLength() {
      assertThrows(
          IllegalArgumentException.class, () -> computeOddTaskCount(-2), ILLEGAL_LENGTH_EXPECTED);
      assertThrows(
          IllegalArgumentException.class, () -> computeEvenTaskCount(-2), ILLEGAL_LENGTH_EXPECTED);
    }

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testMinValueLength")
    void testMinValueLength() {
      assertThrows(
          IllegalArgumentException.class,
          () -> computeOddTaskCount(Integer.MIN_VALUE),
          ILLEGAL_LENGTH_EXPECTED);
      assertThrows(
          IllegalArgumentException.class,
          () -> computeEvenTaskCount(Integer.MIN_VALUE),
          ILLEGAL_LENGTH_EXPECTED);
    }

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testOneValueLength")
    void testOneValueLength() {
      assertEquals(0, computeOddTaskCount(1), ZERO_TASKS_EXPECTED);
      assertEquals(0, computeEvenTaskCount(1), ZERO_TASKS_EXPECTED);
    }

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testTwoValueLength")
    void testTwoValueLength() {
      assertEquals(0, computeOddTaskCount(2), ZERO_TASKS_EXPECTED);
      assertEquals(1, computeEvenTaskCount(2), ONE_TASK_EXPECTED);
    }

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testThreeValueLength")
    void testThreeValueLength() {
      assertEquals(1, computeOddTaskCount(3), ONE_TASK_EXPECTED);
      assertEquals(1, computeEvenTaskCount(3), ONE_TASK_EXPECTED);
    }

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testFourValueLength")
    void testFourValueLength() {
      assertEquals(1, computeOddTaskCount(4), ONE_TASK_EXPECTED);
      assertEquals(2, computeEvenTaskCount(4), "Two tasks expected");
    }

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testMaxValueLength")
    void testMaxValueLength() {
      assertEquals(
          Integer.MAX_VALUE / 2, computeOddTaskCount(Integer.MAX_VALUE), HALF_TASKS_EXPECTED);
      assertEquals(
          Integer.MAX_VALUE / 2, computeEvenTaskCount(Integer.MAX_VALUE), HALF_TASKS_EXPECTED);
    }

    @Test
    @DisplayName("BrickSortParallelTest.ComputeTaskCountTest.testMaxValueLengthEven")
    void testMaxValueLengthEven() {
      assertEquals(
          (Integer.MAX_VALUE - 2) / 2,
          computeOddTaskCount(Integer.MAX_VALUE - 1),
          HALF_TASKS_EXPECTED);
      assertEquals(
          (Integer.MAX_VALUE - 1) / 2,
          computeEvenTaskCount(Integer.MAX_VALUE - 1),
          HALF_TASKS_EXPECTED);
    }
  }

Am I missing anything in the above test class?

The full classes are available at:

https://raw.githubusercontent.com/Fernal73/DSAlgos/master/src/test/java/ds/tests/BrickSortParallelTest.java

https://raw.githubusercontent.com/Fernal73/DSAlgos/master/src/main/java/ds/BrickSortParallel.java

$ java --version
openjdk 11.0.8 2020-07-14
OpenJDK Runtime Environment (build 11.0.8+10)
OpenJDK 64-Bit Server VM (build 11.0.8+10, mixed mode)

Jacoco version: 0.85

From the report, the static block has a cyclomatic complexity of 2 and with only one branch covered, that implies there's a test case missing to cover that eventuality.

ANSWER

Answered 2020-Aug-26 at 12:38

To quote Marc R Hoffman on Jacoco Github:

"Your code uses the assert keyword which results in a static initializer:

static {};
  descriptor: ()V
  flags: (0x0008) ACC_STATIC
  Code:
    stack=1, locals=0, args_size=0
       0: ldc           #72                 // class ds/BrickSortParallel
       2: invokevirtual #73                 // Method java/lang/Class.desiredAssertionStatus:()Z
       5: ifne          12
       8: iconst_1
       9: goto          13
      12: iconst_0
      13: putstatic     #31                 // Field $assertionsDisabled:Z
      16: return
    LineNumberTable:
      line 19: 0
    StackMapTable: number_of_entries = 2
      frame_type = 12 /* same */
      frame_type = 64 /* same_locals_1_stack_item */
        stack = [ int ]

This is a know limitation. The workaround is to not use assert."

The following code snippet resolves the conundrum:


  @Generated
private void assertEquality(int  size, int count) {
if (size != count)
 throw new AssertionError("Size is not the same as count.");
    }

It throws AssertionError and yet code coverage requirements are satisfied by the @Generated annotation. It is, however, a workaround. The solution is to wait for Jacoco to provide the needed filtering of assertions in the byte code.

Filtering assertions is a work in progress.

Source https://stackoverflow.com/questions/63560283

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Vulnerabilities

No vulnerabilities reported

Install dsalgo

You can download it from GitHub.
You can use dsalgo like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the dsalgo component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .