Submission #1370215

#	Time	Username	Problem	Language	Result	Execution time	Memory
1370215		eyadooz	Lutrija (COCI19_lutrija)	C++20	14 / 70	111 ms	432 KiB

lutrija

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int) (x).size()
#define endl '\n'
#define int long long

bool prime(int x) {
    for(int i=2;i*i<=x;i++) {
        if(x%i==0) return 0;
    }
    return 1;
}
main()
{
    cin.tie(0) -> sync_with_stdio(0);

    int a, b;
    cin >> a >> b;
    bool swp=0;
    int orgb=b, oa, ob;
    if(a>b) {swap(a, b);swp=1;}
    oa=a, ob=b;
    if(a==2) {
        vector<int> ans;
        if(prime(b-a)) {
            ans.pb(a);
            ans.pb(b);
        }
        else if(prime(b+2)) {
            ans.pb(a);
            ans.pb(b+2);
            ans.pb(b);
        }
        else if(b-2>1&&prime(b-2)&&prime(abs(b-4))) {
            ans.pb(a);
            ans.pb(b-2);
            ans.pb(b);
        }
        if(swp) reverse(all(ans));
        if(sz(ans)==0) {cout << -1 << endl;return 0;}
        cout << sz(ans) << endl;
        for(auto i : ans) cout << i << " ";
    }
    else {
        vector<int> ans;
        bool valid=1;
        ans.pb(a);
        while(a<b&&sz(ans)<=30) {
            a+=2;
            if(!prime(a)) valid=0;
            ans.pb(a);
        }
        if(swp) reverse(all(ans));
        if(ans.back()!=orgb||!valid||sz(ans)>30) {
            ans.clear();
            a=oa, b=ob;
            ans.pb(a);
            if(!prime(abs(a-2))) {cout << -1 << endl;return 0;}
            a=2;
            if(prime(b-a)) {
                ans.pb(a);
                ans.pb(b);
            }
            else if(prime(b+2)) {
                ans.pb(a);
                ans.pb(b+2);
                ans.pb(b);
            }
            else if(b-2>1&&prime(b-2)&&prime(abs(b-4))) {
                ans.pb(a);
                ans.pb(b-2);
                ans.pb(b);
            }
            if(swp) reverse(all(ans));
            if(sz(ans)==0) {cout << -1 << endl;return 0;}
            cout << sz(ans) << endl;
            for(auto i : ans) cout << i << " ";
            return 0;
        }
        cout << sz(ans) << endl;
        for(auto i : ans) cout << i << " ";
    }
}

Compilation message (stderr)

lutrija.cpp:20:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   20 | main()
      | ^~~~

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 0 / 7
• Subtask 4: 0 / 7
• Subtask 5: 0 / 7
• Subtask 6: 0 / 7
• Subtask 7: 0 / 7
• Subtask 8: 0 / 7
• Subtask 9: 0 / 7
• Subtask 10: 0 / 7