結果
| 問題 |
No.979 Longest Divisor Sequence
|
| ユーザー |
chakku
|
| 提出日時 | 2020-01-31 23:08:54 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,288 bytes |
| コンパイル時間 | 2,066 ms |
| コンパイル使用メモリ | 184,724 KB |
| 実行使用メモリ | 28,160 KB |
| 最終ジャッジ日時 | 2024-09-17 10:22:15 |
| 合計ジャッジ時間 | 3,636 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 6 WA * 10 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
/*{{{*/ //template
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rrep(i,n) for(int i=(n)-1;i>=0;i--)
constexpr int INF = numeric_limits<int>::max()/2;
constexpr long long LINF = numeric_limits<long long>::max()/3;
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
#define sz(x) (int)(x).size()
#define debug(x) cerr<<#x<<":"<<x<<endl
#define debug2(x,y) cerr<<#x<<","<<#y":"<<x<<","<<y<<endl
//struct fin{ fin(){ cin.tie(0); ios::sync_with_stdio(false); } } fin_;
struct Double{ double d; explicit Double(double x) : d(x){} };
ostream& operator<<(ostream& os,const Double x){ os << fixed << setprecision(20) << x.d; return os; }
template<typename T> ostream& operator<<(ostream& os,const vector<T>& vec){ os << "["; for(const auto& v : vec){ os << v << ","; } os << "]"; return os; }
template<typename T,typename U> ostream& operator<<(ostream& os, const map<T,U>& mp){ os << "{"; for(auto& p : mp){ os << p << ","; } os << "}"; return os; }
template<typename T,typename U> ostream& operator<<(ostream& os,const pair<T,U>& p){ os << "(" << p.first << ","<< p.second <<")"; return os; }
template<typename T> ostream& operator<<(ostream& os,const set<T>& st){ os<<"{"; for(T v:st) os<<v<<","; os <<"}"; return os; }
template<typename T,typename U> inline void chmax(T &x,U y){ if(y>x) x = y; }
template<typename T,typename U> inline void chmin(T &x,U y){ if(y<x) x = y; }
using ll = long long;
using ull = unsigned long long;
using pii = std::pair<int,int>;
using vi = std::vector<int>;
typedef vector<vi> vvi;
ll gcd(ll a,ll b){ if(b==0) return a; else return gcd(b,a%b); }
constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }
//constexpr double eps = 1e-14;
constexpr double eps = 1e-10;
constexpr ll mod = 1e9+7;
const int dx[]={1,0,-1,0} ,dy[] = {0,1,0,-1};
/*}}}*/
const int max_n = 300005;
vector<ll> prime(ll n){
vector<ll> primes;
vector<bool> p(n+1,true);
p[0] = p[1] = false;
for(ll i=2;i<=n;i++){
if(!p[i]) continue;
if(p[i]) primes.push_back(i);
for(ll j=2;i*j<=n;j++) p[i*j]=false;
}
return primes;
}
template<typename T>
int LongestCommonSubsequence(const T& s, const T& t){
int n = s.size();
int m = t.size();
vector<vector<int>> dp(n+1,vector<int>(m+1,0));
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
if(s[i] == t[j]){
dp[i+1][j+1] = dp[i][j]+1;
}else{
dp[i+1][j+1] = max(dp[i+1][j],dp[i][j+1]);
}
}
}
return dp[n][m];
}
int main(){
int n; cin >> n;
vector<int> a(n);
rep(i,n) cin >> a[i];
vector<ll> ps = prime(max_n);
map<int,vector<int>> vs;
for(auto p : ps){
if(p*p > max_n) continue;
ll val = p;
while(val < max_n){
vs[p].emplace_back(val);
val *= p;
}
}
ll ans = 1;
for(auto p : ps){
if(!vs.count(p)) continue;
ll len = LongestCommonSubsequence(vs[p],a);
ans = max(ans,len);
}
cout << ans << endl;
//for(auto p : ps){
// if(!vs.count(p)) continue;
// cout << p << " " << vs[p] << endl;
//}
//cout << ps << endl;
}
chakku