Submission #728707

#	Time	Username	Problem	Language	Result	Execution time	Memory
728707		MilosMilutinovic	Table Tennis (info1cup20_tabletennis)	C++14	100 / 100	1126 ms	5600 KiB

tabletennis

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

int n,k,a[305005];

bool solve(int x)
{
    int p=n+k,c=0;
    vector<int> ans;
    for(int i=1;i<=n+k;i++)
    {
        while(p>i&&a[i]+a[p]>x) p--;
        if(p>i&&a[i]+a[p]==x)
        {
            ans.push_back(a[i]);
            ans.push_back(a[p]);
            c++,p--;
        }
    }
    if(c>=n/2)
    {
        sort(ans.begin(),ans.end());
        for(int i=0;i<(int)ans.size();i++) printf("%d ",ans[i]);
        return true;
    }
    return false;
}

signed main()
{
    scanf("%d%d",&n,&k);
    for(int i=1;i<=n+k;i++) scanf("%d",&a[i]);
    sort(a+1,a+n+k+1);
    if(n<=k)
    {
        for(int i=1;i<=n+k;i++) for(int j=i+1;j<=n+k;j++) if(solve(a[i]+a[j])) exit(0);
    }
    else
    {
        mt19937 rng(time(0));
        while(true)
        {
            int x=rng()%(n+k)+1;
            for(int i=max(1,(n+k-x)-3*(k+1));i<=min(n+k,(n+k-x)+3*(k+1));i++) if(x!=i&&solve(a[x]+a[i])) exit(0);
        }
    }
}

Compilation message (stderr)

tabletennis.cpp: In function 'int main()':
tabletennis.cpp:31:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |     scanf("%d%d",&n,&k);
      |     ~~~~~^~~~~~~~~~~~~~
tabletennis.cpp:32:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     for(int i=1;i<=n+k;i++) scanf("%d",&a[i]);
      |                             ~~~~~^~~~~~~~~~~~

• 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