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Name	Size	Permission	Date
a.cpp	2.38 KB	-rwxr-x---	2024-08-28 22:35
cerror.txt	0 B	-rwxr-x---	2024-08-28 22:35
error.txt	0 B	-rwxr-x---	2024-08-28 22:35
submit_info.txt	334 B	-rwxr-x---	2024-08-28 22:35

Rename

//#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using lint = long long;
constexpr lint mod = 1e9 + 7;
#define all(x) begin(x), end(x)
#define bitcount(n) __builtin_popcountll((lint)(n))
#define fcout cout << fixed << setprecision(15)
#define highest(x) (63 - __builtin_clzll(x))
#define rep(i, n) for(int i = 0; i < int(n); i++)
#define rep2(i, l, r) for(int i = int(l); i < int(r); i++)
#define repr(i, n) for(int i = int(n) - 1; i >= 0; i--)
#define repr2(i, l, r) for(int i = int(r) - 1; i >= int(l); i--)
#define accumulate you cannot use this word!
constexpr int inf9 = 1e9; constexpr lint inf18 = 1e18;
inline void Yes(bool condition){ if(condition) cout << "Yes" << endl; else cout << "No" << endl; }
template<class itr> void array_output(itr start, itr goal){ for(auto i = start; i != goal; i++) cout << (i == start ? "" : " ") << (*i); cout << endl; }
template<class itr> void cins(itr first, itr last){ for(auto i = first; i != last; i++){ cin >> (*i); } }
template<class T> T gcd(T a, T b){ if(b) return gcd(b, a % b); else return a; }
template<class T> T lcm(T a, T b){ return a / gcd(a, b) * b; }
template<class T> bool chmax(T &a, const T &b){ if(a < b){ a = b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b){ if(b < a){ a = b; return 1; } return 0; }
inline int has(lint i, int j){ return (i >> j) & 1; }
int dy[4] = {1, 0, -1, 0}; int dx[4] = {0, 1, 0, -1};
bool is_inside(lint y, lint x, lint H, lint W){ return (0 <= y && y < H && 0 <= x && x < W); }

struct io_init {
    io_init() {
        cin.tie(nullptr); cout.tie(nullptr);
        std::ios::sync_with_stdio(false);
    }
} io_init;

int n;
string s[20];
int len[20];

int dp[26][1 << 16];

int make_str(char at, int bit_used){
    if(dp[at - 'a'][bit_used] != -1){
        return dp[at - 'a'][bit_used];
    }
    
    int ans = 0;
    rep(i, n){
        if(!has(bit_used, i) && s[i][0] == at){
            char to = s[i].back();
            chmax(ans, len[i] + make_str(to, bit_used | (1 << i)));
        }
    }
    
    return dp[at - 'a'][bit_used] = ans;
}

int main(){
    cin >> n;
    rep(i, n){
        cin >> s[i];
        len[i] = int(s[i].size());
    }
    
    rep(i, 26) rep(j, 1 << 16){
        dp[i][j] = -1;
    }
    
    int ans = 0;
    rep(i, 26){
        chmax(ans, make_str('a' + i, 0));
    }
    cout << ans << endl;
}