Submission #1223302

#	Time	Username	Problem	Language	Result	Execution time	Memory
1223302		Dreamy_lovesper	Lampice (COCI19_lampice)	C++20	0 / 110	5095 ms	7492 KiB

lampice

#include <bits/stdc++.h>

using namespace std;

// Do you think you'll ever remember me someday, or will I just fade away from your memory?
#define LIFESUCK ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define str string
#define mll map<ll, ll>
#define vll vector<ll>
#define pll pair<ll, ll>
#define fi first 
#define se second 
#define all(c) c.begin(), c.end()
#define pb push_back
#define debug cout << "I Love You\n";
#define fu(i, a, b) for (int i = a; i <= b; i++)
#define fd(i, b, a) for (int i = b; i >= a; i--)
#define Bitc(msk, j) ((msk >> j) & 1)
#define _log(x) 31 - __builtin_clz(x)

const ll Mod = 1e9 + 7;
const ll inf = (1ll << 30);
const ll lnf = (1ll << 60);

// When time passes and things change... will you still remember someone like me?
int64_t add(ll &a, ll b) {
    a += b;
    if (a >= Mod) a %= Mod;
    while (a < 0) a += Mod;
    return a;
}
int64_t mul(ll a, ll b) {
    a = 1ll * a * b % Mod;
    return a;
}

template <class X, class Y>
bool minimize(X &x, Y y) {
    X eps = 1e-9;
    if (x > y + eps) {
        x = y;
        return 1;
    }
    return 0;
}

template <class X, class Y>
bool maximize(X &x, Y y) {
    X eps = 1e-9;
    if (x + eps < y) {
        x = y;
        return 1;
    }
    return 0;
}

// I wonder… will I just become a distant memory to you one day?
#define mxn 200'007
ll n, len;
str s;
vll graph[mxn];

struct Edge{
    ll u, v;
} edge[mxn];

namespace Love1 {
    bool check () {
        return (n <= 3000);
    }

    vector<char> t;
    const ll base = 37;

    bool dfs(ll u, ll p, ll end) {
        if(u == end) return 1;
        for(auto&v: graph[u]) {
            if(v == p) continue;
            if(dfs(v, u, end)) { t.pb(s[v]); return 1;}
        }
        return 0;
    }

    ll get(){
        ll sad = 0;
        for(auto&i: t) sad = (sad * base + i) % Mod;
        return sad;
    }

    ll getReverse(){
        ll sad = 0;
        fd(i, t.size() - 1, 0) sad = (sad * base + t[i]) % Mod;
        return sad;
    }

    void DreamyLove () {
        ll sad = 1;

        fu(u, 1, n) {
            fu(v, u + 1, n) {
                t.clear();
                dfs(u, 0, v); t.pb(s[u]);
                // cerr << u << ' ' << v << '\n';
                // for(auto&i: t) cerr << i;
                // cerr << '\n' << '\n';
                if(get() == getReverse()) maximize(sad, t.size());
            }
        }

        cout << sad;
    }
}

void lovesper(const ll &TestCase) {
    
    cin >> n >> s;
    len = s.size(); s = '#' + s;
    fu(i, 2, n) {
        ll u, v; cin >> u >> v;
        graph[u].pb(v);
        graph[v].pb(u);
        edge[i] = {u, v};
    }

    if(Love1::check()) {
        Love1::DreamyLove();
        return;
    }

}

signed main() {
    LIFESUCK

    #define name "lovesper"
    // freopen(name".inp", "r", stdin);
    // freopen(name".out", "w", stdout);
    
    ll Test = 1;
    // cin >> Test;

    fu(i, 1, Test) {
        lovesper(i);
        if (i < Test) cout << '\n';
    }

    return 0;
}

• Subtask 1: 0 / 17
• Subtask 2: 0 / 25
• Subtask 3: 0 / 31
• Subtask 4: 0 / 37