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Correct the wrong iterative DFS implementation #867

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Merged
poyea merged 2 commits into from
Jun 4, 2019
Merged

Correct the wrong iterative DFS implementation #867

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e5552e5
Update DFS.py
ZJUGuoShuai Jun 2, 2019
138e09e
Update DFS.py
ZJUGuoShuai Jun 2, 2019
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9 changes: 7 additions & 2 deletions graphs/DFS.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,10 +18,15 @@ def dfs(graph, start):
explored, stack = set(), [start]
explored.add(start)
while stack:
v = stack.pop() # the only difference from BFS is to pop last element here instead of first one
v = stack.pop() # one difference from BFS is to pop last element here instead of first one

if v in explored:
continue

explored.add(v)

for w in graph[v]:
if w not in explored:
explored.add(w)
stack.append(w)
return explored

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