Created
January 24, 2023 04:23
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from os import * | |
from sys import * | |
from collections import * | |
from math import * | |
def checkgraph(edges, n, m): | |
neighbors = defaultdict(set) | |
for node1, node2 in edges: | |
neighbors[node1].add(node2) | |
neighbors[node2].add(node1) | |
def dfs(root, visited): | |
if root in visited: | |
return False | |
visited.add(root) | |
for neighbor in neighbors[root]: | |
neighbors[neighbor].remove(root) | |
if not dfs(neighbor, visited): | |
return False | |
return True | |
visited = set() | |
result = dfs(edges[0][0], visited) and len(visited) == n | |
return result | |
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