Merge branch 'master' into add-valid-parentheses

Author: DenizAltunkapan

pom.xml

@@ -119,7 +119,7 @@
             <plugin>
                 <groupId>com.github.spotbugs</groupId>
                 <artifactId>spotbugs-maven-plugin</artifactId>
-                <version>4.9.8.1</version>
+                <version>4.9.8.2</version>
                 <configuration>
                     <excludeFilterFile>spotbugs-exclude.xml</excludeFilterFile>
                     <includeTests>true</includeTests>

src/main/java/com/thealgorithms/backtracking/Combination.java

@@ -7,8 +7,7 @@
 import java.util.TreeSet;
 
 /**
- * Finds all permutations of given array
- * @author Alan Piao (<a href="https://github.com/cpiao3">git-Alan Piao</a>)
+ * Finds all combinations of a given array using backtracking algorithm * @author Alan Piao (<a href="https://github.com/cpiao3">git-Alan Piao</a>)
  */
 public final class Combination {
     private Combination() {

src/main/java/com/thealgorithms/maths/Area.java

@@ -96,7 +96,7 @@ public static double surfaceAreaCylinder(final double radius, final double heigh
             throw new IllegalArgumentException(POSITIVE_RADIUS);
         }
         if (height <= 0) {
-            throw new IllegalArgumentException(POSITIVE_RADIUS);
+            throw new IllegalArgumentException(POSITIVE_HEIGHT);
         }
         return 2 * (Math.PI * radius * radius + Math.PI * radius * height);
     }

src/main/java/com/thealgorithms/maths/Perimeter.java

@@ -27,7 +27,7 @@ public static float perimeterRegularPolygon(int n, float side) {
      * @param side2 for length of side 2
      * @param side3 for length of side 3
      * @param sides for length of remaining sides
-     * @return Perimeter of given trapezoid.
+     * @return Perimeter of given irregular polygon.
      */
     public static float perimeterIrregularPolygon(float side1, float side2, float side3, float... sides) {
         float perimeter = side1 + side2 + side3;