Submission #229579

#	Time	Username	Problem	Language	Result	Execution time	Memory
229579		rrrr10000	Lutrija (COCI19_lutrija)	C++14	70 / 70	777 ms	504 KiB

lutrija

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n)  for(long long i=0;i<(long long)(n);i++)
#define REP(i,k,n) for(long long i=k;i<(long long)(n);i++)
#define all(a) a.begin(),a.end()
#define pb emplace_back
#define eb emplace_back
#define lb(v,k) (lower_bound(all(v),k)-v.begin())
#define ub(v,k) (upper_bound(all(v),k)-v.begin())
#define fi first
#define se second
#define pi M_PI
#define PQ(T) priority_queue<T>
#define SPQ(T) priority_queue<T,vector<T>,greater<T>>
#define dame(a) {out(a);return 0;}
#define decimal cout<<fixed<<setprecision(15);
#define dupli(a) a.erase(unique(all(a)),a.end())
typedef long long ll;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> PP;
typedef tuple<ll,ll,ll,ll> PPP;
typedef multiset<ll> S;
using vi=vector<ll>;
using vvi=vector<vi>;
using vvvi=vector<vvi>;
using vvvvi=vector<vvvi>;
using vp=vector<P>;
using vvp=vector<vp>;
using vb=vector<bool>;
using vvb=vector<vb>;
const ll inf=1001001001001001001;
const ll INF=1001001001;
const ll mod=1000000007;
const double eps=1e-10;
template<class T> bool chmin(T&a,T b){if(a>b){a=b;return true;}return false;}
template<class T> bool chmax(T&a,T b){if(a<b){a=b;return true;}return false;}
template<class T> void out(T a){cout<<a<<'\n';}
template<class T> void outp(T a){cout<<'('<<a.fi<<','<<a.se<<')'<<'\n';}
template<class T> void outvp(T v){rep(i,v.size())cout<<'('<<v[i].fi<<','<<v[i].se<<')';cout<<'\n';}
template<class T> void outvvp(T v){rep(i,v.size())outvp(v[i]);}
template<class T> void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<'\n';}
template<class T> void outvv(T v){rep(i,v.size())outv(v[i]);}
template<class T> bool isin(T x,T l,T r){return (l)<=(x)&&(x)<=(r);}
template<class T> void yesno(T b){if(b)out("yes");else out("no");}
template<class T> void YesNo(T b){if(b)out("Yes");else out("No");}
template<class T> void YESNO(T b){if(b)out("YES");else out("NO");}
template<class T> void noyes(T b){if(b)out("no");else out("yes");}
template<class T> void NoYes(T b){if(b)out("No");else out("Yes");}
template<class T> void NOYES(T b){if(b)out("NO");else out("YES");}
void outs(ll a,ll b){if(a>=inf-100)out(b);else out(a);}
ll gcd(ll a,ll b){if(b==0)return a;return gcd(b,a%b);}
ll modpow(ll a,ll b){a%=mod;if(b==0)return 1;if(b&1)return a*modpow(a,b-1)%mod;ll k=modpow(a,b/2);return k*k%mod;}
bool is_prime(ll n){
    if(n<=1)return false;
    REP(i,2,sqrt(n)+1)if(n%i==0)return false;
    return true;
}
int main(){
    ll a,b;cin>>a>>b;
    int x=0,y=0;
    if(a==2)x=2;
    for(ll i=a;i<=inf;i+=2){
        if(!is_prime(i))break;
        if(is_prime(i-2))x=1;
    }
    for(ll i=a-2;i>=2;i--){
        if(!is_prime(i))break;
        if(is_prime(i-2))x=3;
    }
    if(b==2)y=2;
    for(ll i=b;i<=inf;i+=2){
        if(!is_prime(i))break;
        if(is_prime(i-2))y=1;
    }
    for(ll i=b-2;i>=2;i--){
        if(!is_prime(i))break;
        if(is_prime(i-2))y=3;
    }
    if(x&&y){
        vi ans;
        ans.pb(a);
        while(ans.back()!=2){
            if(is_prime(ans.back()-2))ans.pb(2);
            else if(x==1)ans.pb(ans.back()+2);
            else ans.pb(ans.back()-2);
        }
        vi res;
        res.pb(b);
        while(res.back()!=2){
            if(is_prime(res.back()-2))res.pb(2);
            else if(x==1)res.pb(res.back()+2);
            else res.pb(res.back()-2);
        }
        for(ll i=res.size()-2;i>=0;i--)ans.pb(res[i]);
        out(ans.size());
        outv(ans);
    }
    else{
        vi ans;
        ans.pb(a);
        while(ans.back()!=b){
            if(a>b){
                ll nk=ans.back()-2;
                if(!is_prime(nk)){
                    out(-1);return 0;
                }
                else ans.pb(nk);
            }
            else{
                ll nk=ans.back()+2;
                if(!is_prime(nk)){
                    out(-1);return 0;
                }
                else ans.pb(nk);
            }
        }
        out(ans.size());
        outv(ans);
    }
}

• 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