Submission #564109

#TimeUsernameProblemLanguageResultExecution timeMemory
564109perchutsSavez (COCI15_savez)C++17
120 / 120
100 ms37516 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; 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; } vector<int>qnt; vector<string>v; ll hsh[2000001], revHsh[2000001]; void computeHash(int idx){ int n = qnt[idx]; hsh[0] = ll(v[idx][0]-'A'+1ll); for(int i=1;i<n;++i){ hsh[i] = hsh[i-1]*base+ll(v[idx][i]-'A'+1ll); hsh[i] %= mod; } revHsh[0] = ll(v[idx][n-1]-'A'+1ll); ll act = 1ll; for(int i=n-2;i>=0;--i){ act = (act*base)%mod; revHsh[n-1-i] = revHsh[n-2-i]+act*ll(v[idx][i]-'A'+1ll); revHsh[n-1-i] %= mod; } } unordered_map<int,int>dp; int main(){_ int n;cin>>n; v.resize(n), qnt.resize(n); for(int i=0;i<n;++i){ cin>>v[i]; qnt[i] = sz(v[i]); } int best = 0; for(int i=0;i<n;++i){ int idx = i; computeHash(idx); int m = qnt[idx], res = 0; for(int j=0;j<m;++j)if(hsh[j]==revHsh[j])ckmax(res,dp[int(hsh[j])]); ++res; if(hsh[m-1]==revHsh[m-1])ckmax(dp[int(hsh[m-1])], res); ckmax(best, res); } cout<<best<<endl; }
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