day 15, trivial

d15/part1.py

@@ -0,0 +1,12 @@
+import sys
+
+S=0
+for l in sys.stdin.read().split(','):
+    c = 0
+    for w in l:
+        c += ord(w)
+        c *= 17
+        c = c % 256
+    print(l, c)
+    S += c
+print(S)

d15/part2.py

@@ -0,0 +1,26 @@
+import sys
+
+def hash(l):
+    c = 0
+    for w in l:
+        c += ord(w)
+        c *= 17
+        c = c % 256
+    return c
+
+B = [ dict() for _ in range(256) ]
+
+for l in sys.stdin.read().split(','):
+    e = l.find('=')
+    d = l.find('-')
+    i = max(e,d)
+    lbl = l[:i]
+    box = hash(lbl)
+    if e > 0:  # set
+        v = int(l[i+1:])
+        B[box][lbl] = v    
+    elif d > 0:  # remove
+        if lbl in B[box]:
+            del B[box][lbl]
+
+print(sum((i+1)*(j+1)*v for i, b in enumerate(B) for j,(k,v) in enumerate(b.items())))