Initial data commit

Task/Matrix-chain-multiplication/Python/matrix-chain-multiplication-7.py

@@ -0,0 +1,29 @@
+def optim4(a):
+    global u
+    n = len(a) - 1
+    u = [None] * n
+    u[0] = [[None, 0]] * n
+    for j in range(1, n):
+        v = [None] * (n - j)
+        for i in range(n - j):
+            m = None
+            for k in range(j):
+                s1, c1 = u[k][i]
+                s2, c2 = u[j - k - 1][i + k + 1]
+                c = c1 + c2 + a[i] * a[i + k + 1] * a[i + j + 1]
+                if m is None or c < m:
+                    s = k
+                    m = c
+            v[i] = [s, m]
+        u[j] = v
+    def aux(i, j):
+        s, c = u[j][i]
+        if s is None:
+            return i
+        else:
+            return [aux(i, s), aux(i + s + 1, j - s - 1)]
+    return u[n - 1][0][1], aux(0, n - 1)
+
+
+print(optim4([1, 5, 25, 30, 100, 70, 2, 1, 100, 250, 1, 1000, 2]))
+print(optim4([1000, 1, 500, 12, 1, 700, 2500, 3, 2, 5, 14, 10]))