Submission #499893

#	Time	Username	Problem	Language	Result	Execution time	Memory
499893		jesus_coconut	Table Tennis (info1cup20_tabletennis)	C++17	29 / 100	3066 ms	79712 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;
}

vector<int> ans;

bool solve(int suma) {
	ans.clear();
	int l = 0, r = n + k - 1;
	int cnt = 0;
	while (l < r) {
		if (v[l] + v[r] == suma) {
			ans.pb(v[l]);
			ans.pb(v[r]);
			if (size(ans) == 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;
}

set<int> bio;

void solve() {
	while (true) {
		int i = rand() % (n + k);
		int j = n - 1 - i + (rand() % (2 * k + 1));
		if (j < 0 || 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(all(ans));
			for (auto &it: ans) cout << it << ' ';
			return;
		}
	}
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	load();
	sort(all(v));
	solve();

	return 0;
}

Compilation message (stderr)

tabletennis.cpp: In function 'bool solve(int)':
tabletennis.cpp:24:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |    if (size(ans) == n) return true;
      |        ~~~~~~~~~~^~~~

• Subtask 1: 11 / 11
• Subtask 2: 9 / 9
• Subtask 3: 0 / 14
• Subtask 4: 0 / 15
• Subtask 5: 9 / 9
• Subtask 6: 0 / 14
• Subtask 7: 0 / 15
• Subtask 8: 0 / 13