Submission #315760

#	Time	Username	Problem	Language	Result	Execution time	Memory
315760		jungsnow	Table Tennis (info1cup20_tabletennis)	C++14	100 / 100	386 ms	32668 KiB

tabletennis

#include<bits/stdc++.h>

using namespace std;

const int N = 155010;

int n, k, a[N];
map<int, int> mp;

bool check(int sum) {
	vector <int> L, R;
	int l = 1, r = n + k, cn = 0;
	while (l < r) {
		if (a[l] + a[r] > sum) {
			if (cn == k) return 0;
			--r;
			++cn;
		} else if (a[l] + a[r] < sum) {
			if (cn == k) return 0;
			++l;
			++cn;
		} else {
			L.push_back(a[l]);
			R.push_back(a[r]);
			++l; --r;
		} 
	}
	for (int x : L) cout<<x<<' ';
	reverse(R.begin(), R.end());
	for (int x : R) cout<<x<<' ';
	return 1;
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	cin >> n >> k;
	for (int i = 1; i <= n + k; ++i) {
		cin >> a[i];
	}		
	if (n <= 3 * k) {
		for (int i = 1; i < n + k; ++i) {
			for (int j = i + 1; j <= n + k; ++j) {
				if (check(a[i] + a[j])) {
					return 0;
				}
			}
		}
	} else {
		for (int i = 1; i <= 2 * k; ++i) {
			for (int j = n - k + 1; j <= n + k; ++j) {
				mp[a[i] + a[j]]++;
			}
		}
		for (auto &ele : mp) {
			if (ele.second >= k) {
				if (check(ele.first)) 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