Submission #1001103

#	Time	Username	Problem	Language	Result	Execution time	Memory
1001103		kachim2	Table Tennis (info1cup20_tabletennis)	C++17	58 / 100	3082 ms	11564 KiB

tabletennis

#include <algorithm>
#include <bits/stdc++.h>
#include <cstdint>
#include <vector>
using namespace std;
vector<pair<int, int>> check_balanced(vector<int> in, int val) {
  set<int> s;
  for (int i : in){
    s.insert(i);
  }
  vector<pair<int, int>> res;
  for (int i : in){
    if(s.count(val-i) && s.count(i) && i!=val-i){
      s.erase(i);
      s.erase(val-i);
      res.emplace_back(i, val-i);
    }
  }
  
  return res;

}
int main() {
  int N, K;
  cin >> N >> K;
  vector<int> input(N+K);
  for(int i = 0; i < N+K; i++){
    cin >> input[i];
  }
  sort(input.begin(), input.end());
  for(int i = 0; i <= K; i++){
    for(int j = 0; j + i <= K; j++){
      const int sp = N+K-j-1;
      auto a = check_balanced(input, input[i]+input[sp]);
      	if(a.size()>=N/2){
	  vector<int> out;
	  for(auto i : a){
	    out.push_back(i.first);
	    out.push_back(i.second);
	  }
	  sort(out.begin(), out.end());
	  for(int i : out){
	    cout << i <<' ';
	  }
	  return 0;
	}
    }
  }
}

Compilation message (stderr)

tabletennis.cpp: In function 'int main()':
tabletennis.cpp:35:19: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   35 |        if(a.size()>=N/2){
      |           ~~~~~~~~^~~~~

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