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Author: JMine97

week15/JeongMin/가장 가까운 공통 조상.py

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+import sys
+input=sys.stdin.readline
+
+t=int(input())
+
+for _ in range(t):
+    n=int(input()) #노드 수
+    tree =[0 for _ in range(n+1)]
+
+    #b의 부모가 a
+    for _ in range(n-1):
+        a, b = map(int,  input().split())
+        tree[b]=a
+
+    a, b = map(int, input().split())
+    a_parents, b_parents = [a], [b]
+
+    while len(set(a_parents)&set(b_parents))==0:
+        ta=tree[a]
+        tb=tree[b]
+
+        a_parents.append(ta)
+        b_parents.append(tb)
+
+        a=ta
+        b=tb
+
+    print(list(set(a_parents)&set(b_parents))[0])