Submission #631818

#	Time	Username	Problem	Language	Result	Execution time	Memory
631818		CyberCow	Xor Sort (eJOI20_xorsort)	C++17	25 / 100	9 ms	1236 KiB

xorsort

#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <string>
#include <cmath>
#include <map>
#include <unordered_map>
#include <fstream>
#include <iomanip>
#include <iterator>
#include <stack>
using namespace std;
using ll = long long;
vector <int> v;
vector <pair<int, int>> ans;
void bubbleSort()
{
    int i, j;
    bool swapped;
    for (i = 0; i < v.size() - 1; i++)
    {
        swapped = false;
        for (j = 0; j < v.size() - i - 1; j++)
        {
            if (v[j] > v[j + 1])
            {
                swap(v[j], v[j + 1]);
                swapped = true;
                ans.push_back({ j, j + 1 });
                ans.push_back({ j + 1, j });
                ans.push_back({ j, j + 1 });
            }
        }
        if (swapped == false)
            break;
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int x, n, i, j, s;
    cin >> n >> s;
    if (s == 1)
    {
        for (i = 0; i < n; i++)
        {
            cin >> x;
            v.push_back(x);
        }
        bubbleSort();
        cout << ans.size() << endl;
        for (i = 0; i < ans.size(); i++)
        {
            cout << ans[i].first + 1 << ' ' << ans[i].second + 1 << '\n';
        }
    }
    else
    {
        for ( i = 0; i < n; i++)
        {
            cin >> x;
            v.push_back(x);
        }
        int m = n;
        for ( i = 19; i >= 0; i--)
        {
            int st = 0;
            for ( j = 0; j < m - 1; j++)
            {
                if (v[j] & (1 << i) && v[j + 1] & (1 << i))
                {
                    st = 1;
                    ans.push_back({ j, j + 1 });
                    v[j] ^= v[j];
                }
                else if(v[j] & (1 << i))
                {
                    st = 1;
                    ans.push_back({ j + 1, j });
                    ans.push_back({ j, j + 1 });
                    v[j + 1] ^= v[j];
                    v[j] ^= v[j + 1];
                }
            }
            if (st)
                m--;
        }
        cout << ans.size() << endl;
        for (i = 0; i < ans.size(); i++)
        {
            cout << ans[i].first + 1 << ' ' << ans[i].second + 1 << '\n';
        }
    }
    return 0;
}

Compilation message (stderr)

xorsort.cpp: In function 'void bubbleSort()':
xorsort.cpp:22:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for (i = 0; i < v.size() - 1; i++)
      |                 ~~^~~~~~~~~~~~~~
xorsort.cpp:25:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         for (j = 0; j < v.size() - i - 1; j++)
      |                     ~~^~~~~~~~~~~~~~~~~~
xorsort.cpp: In function 'int main()':
xorsort.cpp:55:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for (i = 0; i < ans.size(); i++)
      |                     ~~^~~~~~~~~~~~
xorsort.cpp:92:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |         for (i = 0; i < ans.size(); i++)
      |                     ~~^~~~~~~~~~~~

• Subtask 1: 25 / 25
• Subtask 2: 0 / 35
• Subtask 3: 0 / 40