三天不刷提
便绝面目可蹭
不过我原本就长的ˊ丑
没差
def findChampion(self, n: int, edges: List[List[int]]) -> int:
indeg = [0 for _ in range(n)]
for e in edges:
indeg[e[1]] += 1
ans = []
for i, deg in enumerate(indeg):
if deg == 0:
ans.append(i)
return ans[0] if len(ans)==1 else -1