Submission #818565

#	Time	Username	Problem	Language	Result	Execution time	Memory
818565		Soumya1	Table Tennis (info1cup20_tabletennis)	C++17	100 / 100	263 ms	33740 KiB

tabletennis

#include <bits/stdc++.h>
#ifdef __LOCAL__
  #include <debug_local.h>
#endif
using namespace std;
void testCase() {
  int n, k;
  cin >> n >> k;
  vector<int> a(n + k);
  for (int &i : a) cin >> i;
  sort(a.begin(), a.end());
  int N = n + k;
  auto check = [&](int s) {
    int i = 0, j = N - 1;
    vector<int> v;
    while (i < j) {
      if (a[i] + a[j] == s) {
        v.push_back(a[i]);
        v.push_back(a[j]);
        i++, j--;
      } else if (a[i] + a[j] > s) {
        j--;
      } else {
        i++;
      }
      if (v.size() == n) {
        sort(v.begin(), v.end());
        for (int i : v) cout << i << " ";
        cout << "\n";
        exit(0);
      }
    }
  };
  if (4 * k >= n) {
    for (int i = 0; i < k + 1; i++) {
      for (int j = N - 1; j >= N - k - 1; j--) {
        check(a[i] + a[j]);
      }
    }
  } else {
    map<int, int> cnt;
    for (int i = 0; i < 2 * k; i++) {
      for (int j = N - 1; j >= N - 2 * k; j--) {
        cnt[a[i] + a[j]]++;
      }
    }
    for (auto [x, y] : cnt) {
      if (y >= k) check(x);
    }
  }
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  testCase();
  return 0;
}

Compilation message (stderr)

tabletennis.cpp: In lambda function:
tabletennis.cpp:26:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   26 |       if (v.size() == n) {
      |           ~~~~~~~~~^~~~

• 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