From e8feb3ca60cf2904ef7ea4103c6fa33ccd3f6de5 Mon Sep 17 00:00:00 2001
From: hofmannol <a@b.c>
Date: Tue, 9 Apr 2024 17:04:49 +0200
Subject: [PATCH] merge noch fehlerhaft

---
 SoSe24/lec03_sort_alg/merge_sort.py | 54 +++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 SoSe24/lec03_sort_alg/merge_sort.py

diff --git a/SoSe24/lec03_sort_alg/merge_sort.py b/SoSe24/lec03_sort_alg/merge_sort.py
new file mode 100644
index 0000000..3d5cc94
--- /dev/null
+++ b/SoSe24/lec03_sort_alg/merge_sort.py
@@ -0,0 +1,54 @@
+from SoSe24.algodat.foundation import AlgoDatArray, AlgoDatValue, read_int_sequence, MinusInf
+from time import perf_counter as pfc
+
+
+def merge_sort(z: AlgoDatArray, storage: AlgoDatArray, left: int, right: int):
+    print(left, right)
+    if left == right:
+        return
+    mid = (left + right) // 2
+    merge_sort(z, storage, left, mid)
+    merge_sort(z, storage, mid+1, right)
+    left_ptr = left
+    right_ptr = right
+    storage_ptr = left
+    print("left: ", end="")
+    for i in range(left, mid+1):
+        print(z[i], " ", end="")
+    print("  right: ", end="")
+    for i in range(mid+1, right+1):
+        print(z[i], " ", end="")
+    while left_ptr <= mid or right_ptr <= right:
+        if left_ptr <= mid and right_ptr <= right:
+            print("Beides ", z[left_ptr], " ", z[right_ptr])
+            if z[left_ptr] < z[right_ptr]:
+                print(" Genommen: ", z[left_ptr])
+                storage[storage_ptr] = z[left_ptr]
+                left_ptr += 1
+                storage_ptr += 1
+            else:
+                print(" Genommen: ", z[right_ptr])
+                storage[storage_ptr] = z[right_ptr]
+                right_ptr += 1
+                storage_ptr += 1
+        elif left_ptr <= mid:
+            storage[storage_ptr] = z[left_ptr]
+            left_ptr += 1
+            storage_ptr += 1
+        else:
+            storage[storage_ptr] = z[right_ptr]
+            right_ptr += 1
+            storage_ptr += 1
+    for i in range(left, right+1):
+        z[i] = storage[i]
+
+
+if __name__ == "__main__":
+    z = read_int_sequence("../../seq0.txt")
+    start = pfc()
+    storage = AlgoDatArray(z.size)
+    AlgoDatValue.summary()
+    merge_sort(z, storage, 0, z.size-1)
+    print(z)
+    print(f"Dauer: {pfc() - start:.4f}s")
+    AlgoDatValue.summary()