Submission #387554

#	Time	Username	Problem	Language	Result	Execution time	Memory
387554		casperwang	Table Tennis (info1cup20_tabletennis)	C++14	87 / 100	3080 ms	2584 KiB

tabletennis

#include <bits/stdc++.h>
using namespace std;
#define debug(args...) kout("[ " + string(#args) + " ]", args)
void kout() { cerr << endl; }
template <class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ',kout(b...); }
template <class T> void pary(T L, T R) { while (L != R) cerr << *L << " \n"[++L==R]; }

const int MAXN = 150000;
const int MAXK = 400;
int N, K;
int a[MAXN+MAXK+1];
bool flag[MAXN+MAXK+1];

signed main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> N >> K;
	for (int i = 1; i <= N+K; i++) {
		cin >> a[i];
	}
	for (int L = 1; L <= K+1; L++) {
		int cnt;
		for (int R = N; R <= N+K; R++) {
			if (R-L+1 < N) continue;
			fill(flag+1, flag+1+N+K, 0);
			int S = a[L] + a[R];
			cnt = 1;
			flag[L] = flag[R] = true;
			int nowR = R-1;
			for (int i = L+1; i < nowR; i++) {
				while (a[i] + a[nowR] > S && nowR > i)
					nowR--;
				if (a[i] + a[nowR] == S) {
					flag[i] = flag[nowR] = true;
					cnt++;
					nowR--;
				}
			}
			if (cnt == N / 2) break;
		}
		if (cnt == N / 2) break;
	}
	for (int i = 1; i <= N+K; i++) {
		if (flag[i]) cout << a[i] << ' ';
	}
	cout << '\n';
}

Compilation message (stderr)

tabletennis.cpp: In function 'int main()':
tabletennis.cpp:40:3: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |   if (cnt == N / 2) break;
      |   ^~

• 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: 0 / 13