#21 : Week5_지윤이티

이티지윤/2606_바이러스BFS.py

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+import sys
+from collections import deque
+
+N = int(sys.stdin.readline())
+C = int(sys.stdin.readline())
+
+graph = [[] for i in range(N+1)]
+
+for i in range(C):
+    a, b = map(int,sys.stdin.readline().split())
+    graph[a].append(b)
+    graph[b].append(a)
+
+visited = []
+def bfs(x):
+    q = deque([x])
+    visited.append(x)
+
+    while q:
+        v = q.popleft()
+        for i in graph[v]:
+            if i not in visited:
+                q.append(i)
+                visited.append(i)
+
+bfs(1)
+print(len(visited) -1) # 1번 컴퓨터는 제외

이티지윤/2606_바이러스DFS.py

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+import sys
+
+n = int(sys.stdin.readline())  # 컴퓨터의 개수
+m = int(sys.stdin.readline())  # 쌍의 개수
+
+graph = [[] for _ in range(n + 1)]
+
+for i in range(m):
+    a, b = map(int, input().split())
+    graph[a].append(b)
+    graph[b].append(a)
+
+result = 0
+visited = [0] * (n + 1)
+
+
+def dfs(start):
+    global result
+    visited[start] = 1
+    for j in graph[start]:
+        if visited[j] == 0:
+            result += 1
+            dfs(j)
+
+
+dfs(1)
+print(result)