Submission #683517

#	Time	Username	Problem	Language	Result	Execution time	Memory
683517		JooDdae	Table Tennis (info1cup20_tabletennis)	C++17	58 / 100	57 ms	8016 KiB

tabletennis

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int n, k, a[200200];

int main(){
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> k;
    for(int i=1;i<=n+k;i++) cin >> a[i];

    map<int, int> mp;
    for(int A=0;A<=k;A++) for(int B=0;B<=k;B++) {
        int L = A+1, R = n+k-B;
        mp[a[L] + a[R]]++;
    }

    for(auto [S, c] : mp) if(5*k >= n || c >= k/2) {
        int l = 1, r = n+k;
        vector<array<int, 2>> v;
        while(l < r && v.size()+(r-l+1)/2 >= n/2) {
            if(a[l] + a[r] == S) {
                v.push_back({l, r});
                l++, r--;
                continue;
            }

            if(S-a[l] > a[r]) l++;
            else r--;
        }

        if(v.size() >= n/2) {
            for(int i=0;i<n/2;i++) cout << a[v[i][0]] << " ";
            for(int i=n/2-1;i>=0;i--) cout << a[v[i][1]] << " ";
            return 0;
        }
    }
}

Compilation message (stderr)

tabletennis.cpp: In function 'int main()':
tabletennis.cpp:21:43: warning: comparison of integer expressions of different signedness: 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |         while(l < r && v.size()+(r-l+1)/2 >= n/2) {
      |                        ~~~~~~~~~~~~~~~~~~~^~~~~~
tabletennis.cpp:32:21: warning: comparison of integer expressions of different signedness: 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   32 |         if(v.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