#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
bool ip(ll x) {
if(x<=1) return false;
for(ll i=2;i*i<=x;++i) {
if(x%i==0) return false;
}
return true;
}
int main() {
ll a,b;
cin>>a>>b;
vector<ll> lst;
lst.push_back(a);
lst.push_back(b);
lst.push_back(2);
if(ip(a-2)) lst.push_back(a-2);
if(ip(a+2)) lst.push_back(a+2);
if(ip(b-2)) lst.push_back(b-2);
if(ip(b+2)) lst.push_back(b+2);
map<ll,int> par;
par[a]=0;
queue<ll> q;
q.push(a);
while(!q.empty()) {
int fr=q.front();
q.pop();
for(auto i:lst) {
if(ip(abs(fr-i)) && par.count(i)==0) {
par[i]=fr;
q.push(i);
}
}
}
if(par.count(b)!=0) {
vector<ll> ans;
while(b>0) {
ans.push_back(b);
b=par[b];
}
reverse(ans.begin(),ans.end());
cout<<ans.size()<<"\n";
for(auto i:ans) cout<<i<<" ";
cout<<"\n";
}else cout<<"-1\n";
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
376 KB |
Output is correct |
2 |
Correct |
5 ms |
376 KB |
Output is correct |
3 |
Correct |
5 ms |
256 KB |
Output is correct |
4 |
Correct |
5 ms |
256 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
256 KB |
Output is correct |
2 |
Correct |
5 ms |
256 KB |
Output is correct |
3 |
Correct |
5 ms |
256 KB |
Output is correct |
4 |
Correct |
5 ms |
376 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
256 KB |
Output is correct |
2 |
Correct |
5 ms |
376 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
256 KB |
Output is correct |
2 |
Correct |
5 ms |
376 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
256 KB |
Output is correct |
2 |
Correct |
5 ms |
256 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
256 KB |
Output is correct |
2 |
Correct |
5 ms |
256 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
168 ms |
256 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
165 ms |
376 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
182 ms |
256 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
133 ms |
256 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |