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.

1 files changed, 38 insertions, 0 deletions

diff --git a/src/test/ReachabilityTest.java b/src/test/ReachabilityTest.java
new file mode 100644
index 0000000..67b29b0
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+++ b/src/test/ReachabilityTest.java
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+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));
+    }
+
+}
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