找出两个有序数组的交集

 1 #include <iostream>
 2 #include <cmath>
 3 using namespace std;
 4
 5 class Vector {
 6 public:
 7     Vector(int input_size) {
 8         size = input_size;
 9         length = 0;
10         data = new int[size];
11     }
12
13     ~Vector() {
14         delete[] data;
15     }
16
17     void insert(const int& value, int loc) {
18         if (loc < 0 || loc > length) {
19             return;
20         }
21         for (int i = length; i > loc ; i--) {
22             data[i] = data[i - 1];
23         }
24         data[loc] = value;
25         length ++;
26     }
27
28     int at(const int& loc) {
29         return data[loc];
30     }
31
32     int getLen() {
33         return length;
34     }
35
36     void output() {
37         cout << length << endl;
38         for (int i = 0; i < length; ++i) {
39             if (i == 0) cout << data[i];
40             else cout << " " << data[i];
41         }
42         cout << endl;
43     }
44 private:
45     int size, length;
46     int * data;
47 };
48
49
50 int main() {
51     int a, b;
52     cin >> a;
53     Vector A(a);
54     for (int i = 0; i < a; ++i) {
55         int num;
56         cin >> num;
57         A.insert(num, i);
58     }
59     cin >> b;
60     Vector B(b);
61     for (int i = 0; i < b; ++i) {
62         int num;
63         cin >> num;
64         B.insert(num, i);
65     }
66 　　
67     int i = 0, j = 0, k = 0;
68
69     Vector C(a);
70     while (i < A.getLen() && j < B.getLen()) {
71         if (A.at(i) == B.at(j)) {
72             C.insert(A.at(i), k ++);
73             i ++;
74             j ++;
75         } else if (A.at(i) > B.at(j)) {
76             j ++;
77         } else if (A.at(i) < B.at(j)) {
78             i ++;
79         }
80     }
81     C.output();
82
83     return 0;
84 }

其实可以用很简洁的代码实现，只是因为自己写了个顺序表类所以代码很长，重点看main函数里的while循环就可以了...