Submission #1370493

#	Time	Username	Problem	Language	Result	Execution time	Memory
1370493		ziyad_alharbi	Lutrija (COCI19_lutrija)	C++20	70 / 70	51 ms	452 KiB

lutrija

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define gcd __gcd
bool prime(int x)
{
    if(x<=1)return 0;
    for(int i=2;i*i<=x;i++)if(!(x%i))return 0;
    return 1;
}
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int a,b;
    cin>>a>>b;
    int sw=0;
    if(a>b)
    {
        swap(a,b);
        sw=1;
    }
    vector<int>vc;
    vc.push_back(a);
    if(a!=2)
    {
        if(prime(a-2))vc.push_back(2);
        else if(prime(a+2))
        {
            vc.push_back(a+2);
            vc.push_back(2);
        }
        else
        {
            cout<<"-1\n";
            return 0;
        }
    }
    a=2;
    if(prime(b-a))vc.push_back(b);
    else if(prime(b+2))
    {
        vc.push_back(b+2);
        vc.push_back(b);
    }
    else
    {
        cout<<"-1\n";
        return 0;
    }
    if(sw)reverse(vc.begin(),vc.end());
    cout<<vc.size()<<endl;
    for(auto i:vc)cout<<i<<' ';
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 7 / 7
• Subtask 4: 7 / 7
• Subtask 5: 7 / 7
• Subtask 6: 7 / 7
• Subtask 7: 7 / 7
• Subtask 8: 7 / 7
• Subtask 9: 7 / 7
• Subtask 10: 7 / 7