...

Makefile

@@ -5,12 +5,12 @@ SHELL=bash
 
 run:
 	make $$P && { head $$S.in | cut -c-80 ; echo ; \
-	              time ./$$P < $$S.in ; echo \
+	              time ./$$P < $$S.in ; echo ; \
 	              cat $$S.ans ; echo ; \
 	              diff -Naur <( ./$$P < $$S.in ) $$S.ans ; }
 
 run_py:
 	head $$S.in | cut -c-80 ; echo ; \
-	time python $$P.py < $$S.in ; echo \
+	time python $$P.py < $$S.in ; echo ; \
 	cat $$S.ans ; echo ; \
 	diff -Naur <( python $$P.py < $$S.in ) $$S.ans

j.py

@@ -0,0 +1,42 @@
+from __future__ import print_function
+import sys, itertools as it
+
+n = int(sys.stdin.readline())
+
+def mul(a, b):
+  x,y = a; z,w = b
+  return x*z + y*w
+def add(a, b):
+  x,y = a; z,w = b
+  return (x+z, y+w)
+def sub(a, b):
+  x,y = a; z,w = b
+  return (x-z, y-w)
+
+def on_line(a, b, c):
+  d = sub(c,a)
+  e = sub(c,b)
+  return d[0]*e[1] == d[1]*e[0]
+
+if n >= 5:
+  line1 = line2 = None
+  P = [ map(int, line.split()) for line in sys.stdin ]
+  for com in it.combinations(P[:5], 3):
+    a,b,c = com
+    if on_line(*com):
+      line1 = [a,b]; break
+  else:
+    print("failure")
+    sys.exit(0)
+  Q = []
+  for p in P:
+    if not on_line(p, *line1):
+      if len(Q) < 2: Q.append(p)
+      if len(Q) > 1:
+        if line2 is None:
+          line2 = Q[:]
+        elif not on_line(p, *line2):
+          print("failure")
+          sys.exit(0)
+
+print("success")