prim.expected

来自「boost库提供标准的C++ API 配合dev c++使用,功能更加强大」· EXPECTED 代码 · 共 10 行

parent[a] = a
parent[b] = a
parent[c] = f
parent[d] = c
parent[e] = d
parent[f] = g
parent[g] = h
parent[h] = a
parent[i] = c