Mega Code Archive
The generic partial_sort algorithms with predicate
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#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 d
igits:\n";
copy(vector1.begin(), vector1.end(), out);
cout << endl << endl;
return 0;
}
/*
Before sorting:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
After sorting by last digits with sort:
10 0 11 1 12 2 13 3 4 14 5 15 6 16 7 17 8 18 9 19
Before sorting:
19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
After sorting with partial_sort to get 5 values with smallest last digits:
10 0 11 1 12 19 18 17 16 15 9 8 7 6 5 4 14 13 3 2
*/
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