d09 part two

d09/run2.py

@@ -0,0 +1,26 @@
+import sys
+
+L = sys.stdin.read().splitlines()
+S = 0
+for report in L:
+    l = [int(r) for r in report.split(' ')]
+
+    prem = [l[0]]
+
+    while not all(v == 0 for v in l):
+        m = []
+        for i in range(0,len(l)-1):
+            m.append(l[i+1] - l[i])
+            
+        prem.append(m[0])
+        l = list(m)
+
+    s = prem[0]
+    signe = -1
+    for a in prem[1:]:
+        s+=(a*signe)
+        signe *= -1
+    S+=s
+
+
+print(S)