day 5 with awk

d05/d05_2.awk

@@ -0,0 +1,23 @@
+BEGIN { FS = ",| -> " }
+function min(a, b) { return a < b ? a : b }
+function max(a, b) { return a > b ? a : b }
+function abs(a) { return a < 0 ? -a : a }
+function sign(a) { return a < 0 ? -1 : 1 }
+$1 == $3 {
+	for (i = min($2, $4); i <= max($2, $4); i++)
+		n+= (++floor[$1, i] == 2)
+	next
+}
+$2 == $4 {
+	for (i = min($1, $3); i <= max($1, $3); i++)
+		n+= (++floor[i, $2] == 2)
+	next
+}
+{
+	i = sign($3-$1)
+	j = sign($4-$2)
+	for (a = 0; a <= abs($3-$1); a++)
+		n+= (++floor[$1+i*a, $2+a*j] == 2)
+	next
+}
+END { print n }

d05/d05_2.py

@@ -1,15 +1,12 @@
-import sys
-W,H = 1000,1000
-grid = [ [ 0 for _ in range(W) ] for _ in range(H) ]
-L = eval(sys.stdin.read())
 sign = lambda x: (1,-1)[x<0]
+grid = [[0 for _ in range(1000)] for _ in range(1000)]
 n=0
 def incr(x,y):
 	global n
 	grid[x][y]+=1
 	if grid[x][y]==2:
 		n+=1
-for ((x1,y1),(x2,y2)) in L:
+for ((x1,y1),(x2,y2)) in eval(__import__("sys").stdin.read()):
 	if x1 == x2:
 		for y in range(min(y1,y2), max(y1,y2)+1):
 			incr(x1,y)
@@ -17,9 +14,8 @@ for ((x1,y1),(x2,y2)) in L:
 		for x in range(min(x1,x2), max(x1,x2)+1):
 			incr(x,y1)
 	else:
-		r = abs(x1-x2)
 		i = sign(x2-x1)
 		j = sign(y2-y1)
-		for a in range(r+1):
+		for a in range(abs(x1-x2)+1):
 			incr(x1+a*i,y1+a*j)
 print(n)