1 #include <cstdlib>
 2 #include <iostream>
 3 #include <algorithm>
 4 using namespace std;
 5 bool cmp( int a, int b)
 6 {
 7     return a < b;
 8 }
 9 int main()
10 {
11     int a[20];
12     for( int i = 0; i < 20; i++)
13         a[i] = rand()%10;
14         
15     for( int i = 0; i < 20; i++)
16         printf("%d ", a[i]);
17     cout << endl << endl;
18     
19     sort( a, a+20, cmp);
20     for( int i = 0; i < 20; i++)
21         printf("%d ", a[i]);
22     cout << endl << endl;
23     
24     int len = unique( a, a+20)-a;
25     cout << len << endl << endl;
26     
27     for( int i = 0; i < 20; i++)
28         printf("%d ", a[i]);
29     cout << endl << endl;
30     
31     for( int i = 0; i < len; i++)
32         printf("%d ", a[i]);
33     cout << endl << endl;
34     
35     return 0;
36 }