feat: update structure

2024-01-22 14:27:40 +08:00
parent 7836c9185c
commit 3544a28a2e
559 changed files with 120846 additions and 4102 deletions
--- a/cs2030s/labs/Lab9/Lab9b/Streaming.java
+++ b/cs2030s/labs/Lab9/Lab9b/Streaming.java
@@ -0,0 +1,37 @@
+import java.util.stream.Stream;
+import java.util.stream.Collectors;
+import java.util.List;
+import java.util.ArrayList;
+
+public class Streaming {
+    public static <T> List<Pair<Integer, T>> encode(Stream<T> stream) {
+        return stream
+                .<List<Pair<Integer, T>>>collect(
+                        ArrayList::new,
+                        (acc, t) -> {
+                            if (acc.isEmpty()) {
+                                acc.add(new Pair<Integer, T>(1, t));
+                                return;
+                            }
+                            Pair<Integer, T> last = acc.get(acc.size() - 1);
+                            if (last.getSnd().equals(t)) {
+                                last.setFst(last.getFst() + 1);
+                            } else {
+                                acc.add(new Pair<>(1, t));
+                            }
+                        },
+                        (pair1, pair2) -> {
+                            if (pair1.isEmpty()) {
+                                pair1.addAll(pair2);
+                                return;
+                            }
+                            Pair<Integer, T> last = pair1.get(pair1.size() - 1);
+                            Pair<Integer, T> first = pair2.get(0);
+                            if (last.getSnd().equals(first.getSnd())) {
+                                last.setFst(last.getFst() + first.getFst());
+                                pair2.remove(0);
+                            }
+                            pair1.addAll(pair2);
+                        });
+    }
+}