제출 #1370235

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1370235		eyadooz	Lutrija (COCI19_lutrija)	C++20	28 / 70	67 ms	452 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;
    if(prime(abs(b-a))) {cout << "2\n"  << a << " " << b << endl;return 0;}
    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);
        }

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

            if(!prime(abs(a-2))||!valid) {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 valid=0;

            if(swp) reverse(all(ans));
            if(sz(ans)==0||!valid||sz(ans)>30) {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 << " ";
    }
}

컴파일 시 표준 에러 (stderr) 메시지

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

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