1 void CMy0713Dlg::OnBnClickedButton1()
2 {
3 vecstduent stds;
4 CString str;
5 str.Format("张三");
6 CStudent *pStd1 = new CStudent(str);
7 str.Format("李四");
8 CStudent *pStd2 = new CStudent(str);
9 str.Format("王五");
10 CStudent *pStd3 = new CStudent(str);
11
12 stds.push_back(pStd1);
13 stds.push_back(pStd2);
14 stds.push_back(pStd3);
15 int ans = get_stds(stds,"张");
16
17
18 }
19
20 UINT CMy0713Dlg::get_stds(vecstduent &stds,char*k)
21 {
22 int ans = 0;//符合k的个数
23 CStudent* temp = NULL; // 用来交换的临时数
24 //冒泡排序
25 for (int i = 0; i < stds.size() -1 ; i++)
26 {
27 for (int j = stds.size() - 1; j > i; j--)
28 {
29
30 if (stds[j - 1]->m_strName > stds[j]->m_strName)
31 {
32 temp = stds[j - 1];
33 stds[j - 1] = stds[j];
34 stds[j] = temp;
35 }
36 }
37 }
38 //二分搜索 返回k的第一个索引 复杂度O(log2n)
39 auto it = stds.begin();
40 int left = 0;
41 int right = stds.size() -1 ;
42 while(left < right)
43 {
44 int mid = (left + right) / 2;
45 int i = 0;
46 while(i < mid)
47 {
48 it ++;
49 i++;
50 }
51 if((*it)->m_strName.Compare(k) >= 0)//比较字符串
52 {
53 right = mid;//缩进右边界
54 }
55 else
56 {
57 left = mid + 1;//缩进左边界
58 }
59 if(left >= right)//防止死循环
60 {
61 if((*it)->m_strName.Compare(k) < 0)
62 it ++;
63 break;
64 }
65 it = stds.begin();
66 }
67
68
69
70 //从索引开始遍历 直到不再符合条件
71 for(;it != stds.end();)
72 {
73 CString cstr = (*it)->m_strName;
74 if(cstr.Find(k) == 0)//如果包含
75 {
76 it = stds.erase(it);
77 m_ShowInfo.AddString(cstr);
78 ans ++;
79 }
80 else //如不包含 之后的全部舍弃
81 break;
82 }
83
84
85 //显示列表
86 for(auto it = stds.begin();it!=stds.end();it++)
87 {
88 m_ShowInfo.AddString((*it)->m_strName);
89 }
90 return ans;
91 }
