結果
| 問題 |
No.1243 約数加算
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2020-10-02 22:25:52 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 235 ms / 2,000 ms |
| コード長 | 4,744 bytes |
| コンパイル時間 | 2,394 ms |
| コンパイル使用メモリ | 214,608 KB |
| 最終ジャッジ日時 | 2025-01-15 00:37:53 |
|
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 1 |
| other | AC * 9 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
template <class T> inline bool chmax(T &a, T b) {
if(a < b) {
a = b;
return 1;
}
return 0;
}
template <class T> inline bool chmin(T &a, T b) {
if(a > b) {
a = b;
return 1;
}
return 0;
}
#define DEBUG
#ifdef DEBUG
template <class T, class U>
ostream &operator<<(ostream &os, const pair<T, U> &p) {
os << '(' << p.first << ',' << p.second << ')';
return os;
}
template <class T> ostream &operator<<(ostream &os, const vector<T> &v) {
os << '{';
for(int i = 0; i < (int)v.size(); i++) {
if(i) {
os << ',';
}
os << v[i];
}
os << '}';
return os;
}
void debugg() { cerr << endl; }
template <class T, class... Args>
void debugg(const T &x, const Args &... args) {
cerr << " " << x;
debugg(args...);
}
#define debug(...) \
cerr << __LINE__ << " [" << #__VA_ARGS__ << "]:", debugg(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif
struct Setup {
Setup() {
cin.tie(0);
ios::sync_with_stdio(false);
cout << fixed << setprecision(15);
}
} __Setup;
using ll = long long;
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
const double EPS = 1e-7;
const int INF = 1 << 30;
const ll LLINF = 1LL << 60;
constexpr int MOD = 1000000007;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};
//-------------------------------------
struct FastFactorize {
ll mul(ll a, ll b, ll c) { return (__int128)a * b % c; }
ll power(ll a, ll b, ll mod) {
ll res = 1;
while(b) {
if(b & 1) {
res = mul(res, a, mod);
}
a = mul(a, a, mod);
b >>= 1;
}
return res;
}
bool isPrime(ll n) {
if(!(n & 1) && n != 2) {
return false;
}
ll d = n - 1;
int s = __builtin_ctzll(d);
d >>= s;
vector<int> A;
if(n <= 1000000000) {
A = {2, 3, 5, 7};
} else {
A = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37};
}
for(int a : A) {
ll p = power(a, d, n);
int i = s;
while(p != 1 && p != n - 1 && a % n && (--i)) {
p = mul(p, p, n);
}
if(p != n - 1 && i != s) {
return false;
}
}
return true;
}
ll rho(ll n) {
auto f = [&](ll a) { return mul(a, a, n) + 1; };
ll x = 0, y = 0, p = 2, q;
int i = 1, t = 0;
while((t++) % 40 || gcd(p, n) == 1) {
if(x == y) {
x = ++i;
y = f(x);
}
if(q = mul(p, abs(y - x), n)) {
p = q;
}
x = f(x);
y = f(f(y));
}
return gcd(p, n);
}
vector<ll> factor(ll n) {
if(n == 1) {
return {};
}
if(isPrime(n)) {
return {n};
}
ll a = rho(n);
assert(a != n && a != 1);
auto l = factor(a), r = factor(n / a);
l.insert(l.end(), r.begin(), r.end());
return l;
}
};
vector<ll> divisor(ll n) {
FastFactorize f;
auto v = f.factor(n);
sort(v.begin(), v.end());
map<ll, vector<ll>> mp;
ll now = 0;
ll tmp = 0;
vector<ll> ls;
for(auto i : v) {
if(now != i) {
tmp = 1;
now = i;
ls.push_back(now);
mp[now].push_back(1);
}
tmp *= i;
mp[now].push_back(tmp);
}
vector<ll> div;
function<void(int, ll)> calc = [&](int cur, ll val) {
if(cur == mp.size()) {
div.push_back(val);
return;
}
for(auto i : mp[ls[cur]]) {
calc(cur + 1, val * i);
}
};
calc(0, 1);
sort(div.begin(), div.end());
div.erase(unique(div.begin(), div.end()), div.end());
return div;
}
void solve() {
ll a, b;
cin >> a >> b;
ll now = a;
vector<ll> ans;
while(now < b) {
auto y = divisor(now);
auto it = upper_bound(ALL(y), b - now);
if(it != y.begin()) {
it--;
}
ans.emplace_back(*it);
now += *it;
}
assert(now == b);
assert((int)ans.size() <= 120);
cout << ans.size() << "\n";
for(int i = 0; i < (int)ans.size(); i++) {
cout << ans[i] << " \n"[i + 1 == (int)ans.size()];
}
}
int main() {
int t;
cin >> t;
while(t--) {
solve();
}
}