Submission #493609

#	Time	Username	Problem	Language	Result	Execution time	Memory
493609		inksamurai	Lutrija (COCI19_lutrija)	C++17	0 / 70	2093 ms	524292 KiB

lutrija

#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
#define rep(i,n) for(int i=0;i<n;i++)
#define crep(i,x,n) for(int i=x;i<n;i++)
#define drep(i,n) for(int i=n-1;i>=0;i--)
#define vec(...) vector<__VA_ARGS__>
#define _3dDwnkq ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
using pii=pair<int,int>;
using vi=vector<int>;

bool prime(ll c){
	if(c==2) return true;
	for(ll j=2;j<=sqrt(c);j++){
		if(c%j==0){
			return false;
		}
	}
	return true;
}

vec(ll) pans,now;

void f(ll a,ll b){
	now.pb(a);
	if(a==b){
		pans=now;
		return;
	}
	if(prime(a+2)){
		f(a+2,b);
	}
	if(a-2>0 and prime(a-2)){
		f(a-2,b);
	}
	now.pop_back();
}

int main(){
_3dDwnkq;
	ll a,b;
	cin>>a>>b;
	if(prime(a+b)){
		cout<<"3\n";
		cout<<a<<" "<<a+b<<" "<<b<<"\b";
		exit(0);
	}
	if(prime(abs(a-b))){
		cout<<"2\n";
		cout<<a<<" "<<b<<"\n";
		exit(0);
	}
	f(a,b);
	if(sz(pans)){
		cout<<sz(pans)<<"\n";
		for(auto x : pans){
			cout<<x<<" ";
		}
		cout<<"\n";
	}else{
		cout<<"-1\n";
	}
//	
	return 0;
}

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