#include <vector>
#include <algorithm>
#include <iostream>
#include <iterator>
using namespace std;
class comp_last {
public:
bool operator()(int x, int y) const
// Compare x and y based on their last base-10 digits:
{
return x 10;
}
};
int main()
{
const int N = 20;
vector<int> vector0;
for (int i = 0; i < N; ++i)
vector0.push_back(i);
vector<int> vector1 = vector0;
ostream_iterator<int> out(cout, " ");
cout << "Before sorting:\n";
copy(vector1.begin(), vector1.end(), out);
cout << endl;
sort(vector1.begin(), vector1.end(), comp_last());
cout << "After sorting by last digits with sort:\n";
copy(vector1.begin(), vector1.end(), out);
cout << endl << endl;
vector1 = vector0;
reverse(vector1.begin(), vector1.end());
cout << "Before sorting:\n";
copy(vector1.begin(), vector1.end(), out);
cout << endl << endl;
partial_sort(vector1.begin(), vector1.begin() + 5,vector1.end(), comp_last());
cout << "After sorting with partial_sort to get 5 values with smallest last digits:\n";
copy(vector1.begin(), vector1.end(), out);
cout << endl << endl;
return 0;
}
|