blob: 5f19624abfbb571e0e6a7ba0cd9a83097c6f4faf (
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import sys
def find_parent(index, parents):
if index != parents[index]:
parents[index] = find_parent(parents[index], parents)
return parents[index]
def main():
with open(sys.argv[1]) as f:
while True:
N, M = map(int, f.readline().split())
if N == 0 and M == 0:
break
parents = list(range(N + 1))
for _ in range(M):
i, j = map(int, f.readline().split())
parents[find_parent(i, parents)] = find_parent(j, parents)
print(len(set(find_parent(x, parents) for x in range(1, N + 1))))
if __name__ == "__main__":
main()
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