제출 #564073

#제출 시각아이디문제언어결과실행 시간메모리
564073perchutsSavez (COCI15_savez)C++17
0 / 120
1082 ms52428 KiB
#include <bits/stdc++.h> #define all(x) x.begin(), x.end() #define sz(x) (int) x.size() #define endl '\n' #define pb push_back #define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL); using namespace std; using ll = long long; using ull = unsigned long long; using ii = pair<int,int>; using iii = tuple<int,int,int>; const int inf = 2e9+1; const ll mod = 1e9+7; const ll base = 101; const int maxn = 2e6+100; template<typename X, typename Y> bool ckmin(X& x, const Y& y) { return (y < x) ? (x=y,1):0; } template<typename X, typename Y> bool ckmax(X& x, const Y& y) { return (x < y) ? (x=y,1):0; } bool cmp(pair<int,string>a,pair<int,string>b){ if(a.first==b.first)return 1; return a.first>b.first; } vector<vector<ll>>hsh, revHsh; vector<pair<int,string>>v; ll mul[maxn]; void computeHash(int idx){ int n = v[idx].first; hsh[idx].pb(ll(v[idx].second[0]-'A')); for(int i=1;i<n;++i){ hsh[idx].pb(hsh[idx].back()*base+ll(v[idx].second[i]-'A')); hsh[idx].back() %= mod; } revHsh[idx].pb(ll(v[idx].second[n-1]-'A')); for(int i=n-2;i>=0;--i){ revHsh[idx].pb(revHsh[idx].back()+mul[n-1-i]*ll(v[idx].second[i]-'A')); revHsh[idx].back() %= mod; } } map<ll,int>dp; int main(){_ int n;cin>>n; v.resize(n); for(int i=0;i<n;++i){ cin>>v[i].second; v[i].first = sz(v[i].second); } mul[0] = 1ll; for(int i=1;i<maxn;++i)mul[i] = (mul[i-1]*base)%mod; sort(all(v), cmp); hsh.resize(n), revHsh.resize(n); int best = 0; for(int i=0;i<n;++i){ computeHash(i); ll me = hsh[i][v[i].first-1]; int res = dp[me]+1; for(int j=0;j<v[i].first;++j){ //termino aqui if(hsh[i][j]!=revHsh[i][j])continue; ckmax(dp[hsh[i][j]], res); } ckmax(best, res); } cout<<best<<endl; }
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