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authorHaidong Ji2020-05-10 16:18:46 -0500
committerHaidong Ji2020-05-10 16:18:46 -0500
commitbc5a6815181068e76316aa4a611647124d18ba48 (patch)
treeaab5f2386523dfb064a51a689310a183f8286016
Reachability done. I found it much easier to work with Java than Python. I tried to start with Python but found it difficult to get started.
-rw-r--r--.idea/.gitignore3
-rw-r--r--.idea/AlgoGraphJava.iml28
-rw-r--r--.idea/codeStyles/Project.xml7
-rw-r--r--.idea/codeStyles/codeStyleConfig.xml5
-rw-r--r--.idea/misc.xml6
-rw-r--r--.idea/modules.xml8
-rw-r--r--.idea/vcs.xml6
-rw-r--r--src/main/Reachability.java47
-rw-r--r--src/test/ReachabilityTest.java38
9 files changed, 148 insertions, 0 deletions
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/AlgoGraphJava.iml b/.idea/AlgoGraphJava.iml
new file mode 100644
index 0000000..f971190
--- /dev/null
+++ b/.idea/AlgoGraphJava.iml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+ <component name="NewModuleRootManager" inherit-compiler-output="true">
+ <exclude-output />
+ <content url="file://$MODULE_DIR$">
+ <sourceFolder url="file://$MODULE_DIR$/src/main" isTestSource="false" />
+ <sourceFolder url="file://$MODULE_DIR$/src/test" isTestSource="true" />
+ </content>
+ <orderEntry type="inheritedJdk" />
+ <orderEntry type="sourceFolder" forTests="false" />
+ <orderEntry type="module-library" scope="TEST">
+ <library name="JUnit5.4">
+ <CLASSES>
+ <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter/5.4.2/junit-jupiter-5.4.2.jar!/" />
+ <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.4.2/junit-jupiter-api-5.4.2.jar!/" />
+ <root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.0.0/apiguardian-api-1.0.0.jar!/" />
+ <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.1.1/opentest4j-1.1.1.jar!/" />
+ <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.4.2/junit-platform-commons-1.4.2.jar!/" />
+ <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-params/5.4.2/junit-jupiter-params-5.4.2.jar!/" />
+ <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-engine/5.4.2/junit-jupiter-engine-5.4.2.jar!/" />
+ <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-engine/1.4.2/junit-platform-engine-1.4.2.jar!/" />
+ </CLASSES>
+ <JAVADOC />
+ <SOURCES />
+ </library>
+ </orderEntry>
+ </component>
+</module> \ No newline at end of file
diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
new file mode 100644
index 0000000..919ce1f
--- /dev/null
+++ b/.idea/codeStyles/Project.xml
@@ -0,0 +1,7 @@
+<component name="ProjectCodeStyleConfiguration">
+ <code_scheme name="Project" version="173">
+ <ScalaCodeStyleSettings>
+ <option name="MULTILINE_STRING_CLOSING_QUOTES_ON_NEW_LINE" value="true" />
+ </ScalaCodeStyleSettings>
+ </code_scheme>
+</component> \ No newline at end of file
diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml
new file mode 100644
index 0000000..a55e7a1
--- /dev/null
+++ b/.idea/codeStyles/codeStyleConfig.xml
@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+ <state>
+ <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
+ </state>
+</component> \ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..1763e15
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="11" project-jdk-type="JavaSDK">
+ <output url="file://$PROJECT_DIR$/out" />
+ </component>
+</project> \ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..522549e
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="ProjectModuleManager">
+ <modules>
+ <module fileurl="file://$PROJECT_DIR$/.idea/AlgoGraphJava.iml" filepath="$PROJECT_DIR$/.idea/AlgoGraphJava.iml" />
+ </modules>
+ </component>
+</project> \ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="VcsDirectoryMappings">
+ <mapping directory="" vcs="Git" />
+ </component>
+</project> \ No newline at end of file
diff --git a/src/main/Reachability.java b/src/main/Reachability.java
new file mode 100644
index 0000000..8d6ab78
--- /dev/null
+++ b/src/main/Reachability.java
@@ -0,0 +1,47 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class Reachability {
+
+ static int reach(ArrayList<ArrayList<Integer>> adj, int x, int y) {
+ ArrayList<Integer> visited = new ArrayList<>();
+ if (x == y)
+ return 1;
+ explore(adj, visited, x, y);
+ if (visited.contains(y))
+ return 1;
+ return 0;
+ }
+
+ private static void explore(ArrayList<ArrayList<Integer>> adj, ArrayList<Integer> visited, int x, int y) {
+ visited.add(x);
+ if (x == y)
+ return;
+ for (int n : adj.get(x)) {
+ if (!visited.contains(n))
+ explore(adj, visited, n, y);
+ }
+ }
+
+
+ public static void main(String[] args) {
+ Scanner scanner = new Scanner(System.in);
+ int n = scanner.nextInt();
+ int m = scanner.nextInt();
+ ArrayList<ArrayList<Integer>> adj = new ArrayList<ArrayList<Integer>>();
+ for (int i = 0; i < n; i++) {
+ adj.add(new ArrayList<Integer>());
+ }
+ for (int i = 0; i < m; i++) {
+ int x, y;
+ x = scanner.nextInt();
+ y = scanner.nextInt();
+ adj.get(x - 1).add(y - 1);
+ adj.get(y - 1).add(x - 1);
+ }
+ int x = scanner.nextInt() - 1;
+ int y = scanner.nextInt() - 1;
+ System.out.println(reach(adj, x, y));
+ }
+}
+
diff --git a/src/test/ReachabilityTest.java b/src/test/ReachabilityTest.java
new file mode 100644
index 0000000..67b29b0
--- /dev/null
+++ b/src/test/ReachabilityTest.java
@@ -0,0 +1,38 @@
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ReachabilityTest {
+
+ @Test
+ void test() {
+ ArrayList<ArrayList<Integer>> adj = new ArrayList<>();
+ for (int i = 0; i < 4; i++) {
+ adj.add(new ArrayList<>());
+ }
+
+ adj.get(0).add(1);
+ adj.get(2).add(1);
+ adj.get(3).add(2);
+ adj.get(0).add(3);
+
+ assertEquals(1, Reachability.reach(adj, 0, 3));
+ }
+
+ @Test
+ void test1() {
+ ArrayList<ArrayList<Integer>> adj = new ArrayList<>();
+ for (int i = 0; i < 4; i++) {
+ adj.add(new ArrayList<>());
+ }
+
+ adj.get(0).add(1);
+
+ adj.get(2).add(1);
+
+ assertEquals(0, Reachability.reach(adj, 0, 3));
+ }
+
+} \ No newline at end of file