c_cpp 克隆图dfs

Posted 2021-05-14

struct GNode {
    int label;
    vector<GNode*> neibs;
    GNode(int x) : label(x) {}
};

typedef unordered_map<const GNode*, GNode*> MAP;

GNode* clone_by_dfs(const GNode *g, MAP &hash) {
    if(hash.find(g) != hash.end()) return hash[g];
    GNode *newg = new GNode(g->label);
    hash[g] = newg;
    for(auto nei : g->neibs) 
        newg->neibs.push_back(clone_by_dfs(nei, hash));
    return newg;
}

GNode *clone_graph(const GNode *g) {
    if(g == nullptr) return nullptr;
    MAP hash;
    clone_by_dfs(g, hash);
    return hash[g];
}

GNode* cloneGrph(const GNode *node) {
    // use unordered_map
    // use queue
}