Submission #500280

#	Time	Username	Problem	Language	Result	Execution time	Memory
500280		jesus_coconut	Table Tennis (info1cup20_tabletennis)	C++17	100 / 100	42 ms	4500 KiB

tabletennis

#include <bits/stdc++.h>
#define pb push_back
#define all(a) begin(a), end(a)
using namespace std;

int n, k;
vector<int> v;
void load() {
	cin >> n >> k;
	v.resize(n + k);
	for (auto &it : v) cin >> it;
}

int const N = 150005;

int ans[N];

bool solve(int suma) {
	int l = 0, r = n + k - 1;
	int cnt = 0;
	int p = 0;
	while (l < r) {
		if (v[l] + v[r] == suma) {
			ans[p++] = v[l];
			ans[p++] = v[r];
			if (p == n) return true;
			++l;
			--r;
		} else if (v[l] + v[r] < suma) {
			++l;
			if (++cnt > k) return false;
		} else {
			--r;
			if (++cnt > k) return false;
		}
	}
	return false;
}

unordered_set<int> bio;

void solve() {
	while (true) {
		int i = rand() % (n + k);
		int j = n + k - 1 - i + k - (rand() % (2 * k + 1));
		if (i >= j || j >= n + k || bio.count(v[i] + v[j])) continue;
		bio.insert(v[i] + v[j]);
		if (solve(v[i] + v[j])) {
			sort(ans, ans + n);
			for (int i = 0; i < n; ++i) {
				cout << ans[i] << ' ';
			}
			return;
		}
	}
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	srand(chrono::steady_clock::now().time_since_epoch().count());
	load();
	sort(all(v));
	solve();

	return 0;
}

• Subtask 1: 11 / 11
• Subtask 2: 9 / 9
• Subtask 3: 14 / 14
• Subtask 4: 15 / 15
• Subtask 5: 9 / 9
• Subtask 6: 14 / 14
• Subtask 7: 15 / 15
• Subtask 8: 13 / 13