josch/cycles_tarjan
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return result instead of using references

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This commit is contained in:
josch 2012-07-04 11:17:29 +02:00
parent 5525015ff1
commit 538b07f0da
1 changed files with 6 additions and 7 deletions
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13
cycles.py
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@ -72,9 +72,8 @@ point_stack = list()
marked = dict() marked = dict()
marked_stack = list() marked_stack = list()
def backtrack(v, f): def backtrack(v):
g = [False] f = False
f[0] = False
point_stack.append(v) point_stack.append(v)
marked[v] = True marked[v] = True
marked_stack.append(v) marked_stack.append(v)
@ -83,10 +82,9 @@ def backtrack(v, f):
A[w] = 0 A[w] = 0
elif w==s: elif w==s:
print_point_stack() print_point_stack()
f[0] = True f = True
elif not marked[w]: elif not marked[w]:
backtrack(w, g) f = backtrack(w) or f
f[0] = f[0] or g[0]
if f: if f:
while marked_stack[-1] != v: while marked_stack[-1] != v:
u = marked_stack.pop() u = marked_stack.pop()
@ -94,12 +92,13 @@ def backtrack(v, f):
marked_stack.pop() marked_stack.pop()
marked[v] = False marked[v] = False
point_stack.pop() point_stack.pop()
return f
for i in range(len(A)): for i in range(len(A)):
marked[i] = False marked[i] = False
for s in range(len(A)): for s in range(len(A)):
backtrack(s, [False]) backtrack(s)
while marked_stack: while marked_stack:
u = marked_stack.pop() u = marked_stack.pop()
marked[u] = False marked[u] = False