Submission #564106

#	Time	Username	Problem	Language	Result	Execution time	Memory
564106		perchuts	Savez (COCI15_savez)	C++17	108 / 120	141 ms	65536 KiB

savez

#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<vector<ll>>hsh, revHsh;
vector<string>v;


void computeHash(int idx){
    int n = qnt[idx];
    vector<vector<ll>>ret[2];
    hsh[idx].pb(ll(v[idx][0]-'A'+1ll));
    for(int i=1;i<n;++i){
        ll add = hsh[idx].back()*base+ll(v[idx][i]-'A'+1ll);
        hsh[idx].pb(add);
        hsh[idx].back() %= mod;
    }
    revHsh[idx].pb(ll(v[idx][n-1]-'A'+1ll));
    ll act = 1ll;
    for(int i=n-2;i>=0;--i){
        act = (act*base)%mod;
        ll add = revHsh[idx].back()+act*ll(v[idx][i]-'A'+1ll);
        revHsh[idx].pb(add);
        revHsh[idx].back() %= 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]);
    }

    hsh.resize(n), revHsh.resize(n);
    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[idx][j]==revHsh[idx][j])ckmax(res,dp[int(hsh[idx][j])]); 
        ++res;
        if(hsh[idx][m-1]==revHsh[idx][m-1])ckmax(dp[int(hsh[idx][m-1])], res); 
        ckmax(best, res);
    }

    cout<<best<<endl;
}

• Subtask 1: 12 / 12
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 12 / 12
• Subtask 5: 12 / 12
• Subtask 6: 12 / 12
• Subtask 7: 12 / 12
• Subtask 8: 12 / 12
• Subtask 9: 12 / 12
• Subtask 10: 0 / 12