Submission #466696

#	Time	Username	Problem	Language	Result	Execution time	Memory
466696		Clan328	Xor Sort (eJOI20_xorsort)	C++17	25 / 100	11 ms	1240 KiB

xorsort

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define nL '\n'
#define all(x) (x).begin(), (x).end()

typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;

bool isWrong(int a, int b, int s) {
	if (s == 1)
		return a >= b;
	return b >= a;
}

int main() {
	#ifdef LOCAL
		freopen("io/input.txt", "r", stdin);
		freopen("io/output.txt", "w", stdout);
	#endif

	ios::sync_with_stdio(0);
	cin.tie(0);

	int n, s;
	cin >> n >> s;
	vi a(n);
	for (int i = 0; i < n; i++)
		cin >> a[i];

	vpii res;
	for (int i = 0; i < n-1; i++) {
		for (int j = 0; j < n-i-1; j++) {
			if (isWrong(a[j], a[j+1], s)) {
				res.pb({j+1, j});
				a[j+1] = a[j]^a[j+1];
				res.pb({j, j+1});
				a[j] = a[j]^a[j+1];
				res.pb({j+1, j});
				a[j+1] = a[j]^a[j+1];
			}
		}
	}

	cout << res.size() << nL;
	for (int i = 0; i < res.size(); i++)
		cout << res[i].first+1 << " " << res[i].second+1 << nL;

	return 0;
}

Compilation message (stderr)

xorsort.cpp: In function 'int main()':
xorsort.cpp:55:20: 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 (int i = 0; i < res.size(); i++)
      |                  ~~^~~~~~~~~~~~

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