PAT : 数据结构与算法题目集（中文）7-6 列出连通集

C++11：

#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;
class graph
{
  private:
    int N, E;
    bool mat[10][10]{false};
    bool book[10]{false};
    vector FSvec;
    void mDFS(int);
    void mBFS(int);
    void print(void);

  public:
    graph(void)
    {
        cin >> N >> E;
        while (E--)
        {
            int a, b;
            cin >> a >> b;
            mat[a][b] = mat[b][a] = true;
        }
        for (int i = 0; i < N; ++i)
            mat[i][i] = true;
    }
    void DFS(void);
    void BFS(void);
};
void graph::print(void)
{
    cout << "{ ";
    for (const auto &i : FSvec)
        cout << i << " ";
    cout << "}" << endl;
}
void graph::DFS(void)
{
    memset(book, false, sizeof(book));
    for (int i = 0; i < N; ++i)
    {
        if (book[i])
            continue;
        for (int j = 0; j < N; ++j)
        {
            if (mat[i][j])
            {
                FSvec.clear();
                mDFS(i);
                print();
                break;
            }
        }
    }
}
void graph::mDFS(int P)
{
    FSvec.push_back(P);
    book[P] = true;
    for (int k = 0; k < N; ++k)
        if (mat[P][k] && !book[k])
            mDFS(k);
}
void graph::BFS(void)
{
    memset(book, false, sizeof(book));
    for (int i = 0; i < N; ++i)
    {
        if (book[i])
            continue;
        for (int j = 0; j < N; ++j)
        {
            if (mat[i][j])
            {
                FSvec.clear();
                mBFS(i);
                print();
                break;
            }
        }
    }
}
void graph::mBFS(int P)
{
    book[P] = true;
    queue Q;
    Q.push(P);
    FSvec.push_back(P);
    while (Q.empty() == false)
    {
        int top = Q.front();
        for (int i = 0; i < N; ++i)
        {
            if(mat[top][i]&&book[i]==false)
            {
                book[i] = true;
                FSvec.push_back(i);
                Q.push(i);
            }
        }
        Q.pop();
    }
}
int main(int argc, char *argv[])
{
    cin.sync_with_stdio(false);
    graph A;
    A.DFS();
    A.BFS();
    return EXIT_SUCCESS;
}

DFS/BFS遍历图需熟练～

 

END