yukicoder contest 282 参戦記 - Qiita

from sys import setrecursionlimit, stdin def find(parent, i): t = parent[i] if t < 0: return i t = find(parent, t) parent[i] = t return t def unite(parent, i, j): i = find(parent, i) j = find(parent, j) if i == j: return parent[j] += parent[i] parent[i] = j readline = stdin.readline setrecursionlimit(10 ** 6) N, M = map(int, readline().split()) box = {} color = {} parent = [-1] * N for i in range(