https://www.acmicpc.net/problem/2644import sysinput = sys.stdin.readlinen = int(input())a, b = map(int, input().split())m = int(input())graph = [[] for _ in range(n+1)]visited = [False] * (n+1)flag = False # 촌수 찾았는지 확인for _ in range(m): x,y = map(int, input().split()) graph[x].append(y) graph[y].append(x)def dfs(v, cnt): global flag visited[v] = True if v == b: flag = Tr..
