#include <iostream>
#include <vector>
#include <set>
#include <algorithm>
#include <map>
using namespace std;
#define sz(x) (int(x.size()))
using vi = vector<int>;
// map< int, vector<int> > res;
vi sf;
long long n;
vector<int> res[40'000]; //i*i <= n
vector<int> res2[40'000]; //i*i >= n, access n/i.
vi solved(1+40'000, 0);
vi solved2(1+40'000, 0);
vector<int> factors[40'000];
vector<int> factors2[40'000];
vector<int>& get_res(long long u)
{
if(u*u <= n) return res[u];
else return res2[n/u];
}
vector<int>& get_factors(long long u)
{
if(u*u <= n) return factors[u];
else return factors2[n/u];
}
int& get_solved(long long u)
{
if(u*u <= n) return solved[u];
else return solved2[n/u];
}
void solve(long long i)
{
// cerr << "solve " << i << '\n';
// if(solved[i]) return;
// solved[i] = 1;
if(solved(i)) return;
else solved(i) = 1;
// cerr << "\n\n\n";
// cerr << "solve: " << i << '\n';
// cerr << "cond = " << int(res.find(i) != res.end()) << '\n';
// if(res.find(i) != res.end()) return;
// cerr << "entered\n";
vi ans(1, i-1);
// for(int j = 2; j < i && j*j <= i; j++)
// cerr << "#\n";
// for(int y: sf) cerr << "y = " << y << '\n';
// cerr << "#2\n";
for(int j: get_factors(i))
{
// cerr << "j = " << j << '\n';
if(j >= i || j*j > i) break;
// cerr << i << " -> " << j << '\n';
long long u = j;
long long v = i/j;
solve(u);
solve(v);
for(int a: (u*u <= n ? res[u] : res2[n/u]))
for(int b: (v*v <= n ? res[v] : res2[n/v]))
ans.push_back(a+b);
}
sort(ans.begin(), ans.end());
ans.erase(unique(ans.begin(), ans.end()), ans.end());
// for(int a: ans) cerr << "a = " << a << '\n';
get_res(i) = ans;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n;
if(n == 1)
{
cout << "1\n 0\n";
return 0;
}
for(int i = 2; i <= n; i++)
{
// cerr << i << " " << n%i << ' ' << int(n%i == 0) << '\n';
if(n % i == 0)
sf.push_back(i);
}
for(int a: sf)
for(int b: sf)
if(a < b && b%a==0)
get_factors(b).push_back(a);
solve(n);
vi ans = res2[1];
// cerr << "sf init = " ;
// for(int q: sf) cerr << q << " ";
// cerr << "\n";
cout << sz(ans) << '\n';
for(int r: ans) cout << r << ' ';
cout << '\n';
}
Compilation message
toy.cpp: In function 'void solve(long long int)':
toy.cpp:52:16: error: no match for call to '(vi {aka std::vector<int>}) (long long int&)'
52 | if(solved(i)) return;
| ^
toy.cpp:53:18: error: no match for call to '(vi {aka std::vector<int>}) (long long int&)'
53 | else solved(i) = 1;
| ^
