Submission #1292125

#	Time	Username	Problem	Language	Result	Execution time	Memory
1292125		shidou26	Lampice (COCI19_lampice)	C++20	110 / 110	3802 ms	62188 KiB

lampice

#include <bits/stdc++.h>
using namespace std;

#ifdef KURUMI
    #include "algo/debug.h"
#endif

#define int long long  

#define endl '\n'
#define fi first
#define se second
#define sz(v) (int)v.size()
#define all(v) v.begin(), v.end()
#define filter(v) v.resize(unique(all(v)) - v.begin())
#define dbg(x) "[" #x << " = " << x << "]" 

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
template<typename T1, typename T2> T2 rand(T1 l, T2 r) {
    return uniform_int_distribution<T2>(l, r)(rng);
}
template<typename T1, typename T2> T2 wrand(T1 l, T2 r, int seed) {
    if(seed == 0) return rand(l, r);
    else return (seed > 0 ? max(rand(l, r), wrand(l, r, seed - 1)) : min(rand(l, r), wrand(l, r, seed + 1)));
}

template<typename T> bool maximize(T &a, T b) {
    if(a < b) {
        a = b;
        return true; 
    }else return false;
}
template<typename T> bool minimize(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }else return false;
}

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, int> pli;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> tp3;

const int N = 5e4 + 3;

int n;
int a[N];
string s;
vector<int> adj[N];

void input() {
	cin >> n >> s;
	s = '.' + s;

	for(int i = 1; i <= n; i++) {
		a[i] = s[i] - 'a' + 1;
	}

	for(int i = 1; i < n; i++) {
		int u, v; cin >> u >> v;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
}

namespace Modulo {
	const int MOD = (119 << 23) + 1;
	const int base = 31;

	int pwr[N];

	int add(int x, int y) {
		return x + y >= MOD ? x + y - MOD : x + y;
	}

	int sub(int x, int y) {
		return x - y < 0 ? x - y + MOD : x - y;
	}

	int prod(int x, int y) {
		return 1LL * x * y % MOD;
	}

	int gen_hash(string s) {
		int tot = 0;
		for(char c : s) tot = add(prod(tot, base), c - 'a' + 1);
		return tot;
	}
}
using namespace Modulo;

namespace Centroid {
	int deepest;
	int siz[N];
	bool passed[N];
	unordered_map<int, bool> exist[N];

	void dfs_size(int u, int p) {
		siz[u] = 1;
		for(int v : adj[u]) {
			if(v == p || passed[v]) continue;
			dfs_size(v, u);
			siz[u] += siz[v];
		}
	}

	int find_centroid(int u, int p, int tar) {
		for(int v : adj[u]) {
			if(v == p || passed[v]) continue;
			if(siz[v] * 2 > tar) return find_centroid(v, u, tar);
		}
		return u;
	}

	bool dfs_get(int u, int p, int up, int down, int dep, int k) {
		if(dep > k) return false;
		maximize(deepest, dep);

		int represent = sub(prod(up, pwr[k - dep]), down);
		if(exist[k - dep][represent]) return true;

		for(int v : adj[u]) {
			if(v == p || passed[v]) continue;
			if(dfs_get(v, u, add(prod(a[v], pwr[dep]), up), add(prod(down, base), a[v]), dep + 1, k)) return true;
		}

		return false;
	}

	void dfs_add(int u, int p, int up, int down, int dep, int k) {
		if(dep > k) return;
		maximize(deepest, dep);

		int represent = sub(prod(up, pwr[k - dep]), down); 
		exist[dep][represent] = true;

		for(int v : adj[u]) {
			if(v == p || passed[v]) continue;
			dfs_add(v, u, add(prod(a[v], pwr[dep]), up), add(prod(down, base), a[v]), dep + 1, k);
		}
	}

	bool decompose(int u, int k) {
		dfs_size(u, -1);
		u = find_centroid(u, -1, siz[u]);

		deepest = 1;
		exist[1][sub(prod(a[u], pwr[k - 1]), a[u])] = true;
		for(int v : adj[u]) {
			if(passed[v]) continue;
			if(dfs_get(v, u, a[v], a[v], 1, k)) return true;
			dfs_add(v, u, add(prod(base, a[v]), a[u]), add(prod(base, a[u]), a[v]), 2, k);
		}
		for(int i = 1; i <= deepest; i++) exist[i].clear();

		passed[u] = true;
		for(int v : adj[u]) {
			if(passed[v]) continue;
			if(decompose(v, k)) return true;
		}

		return false;
	}
}
using namespace Centroid;

bool trial(int k) {
	if(k == 1) return true;
	for(int i = 1; i <= n; i++) {
		passed[i] = false;
		exist[i].clear();
	}

	return decompose(1, k);
}

void process() {
	pwr[0] = 1;
	for(int i = 1; i <= n; i++) {
		pwr[i] = prod(pwr[i - 1], base);
	}

	vector<int> odd, even;
	for(int i = 1; i <= n; i++) {
		(i & 1 ? odd.push_back(i) : even.push_back(i));
	}

	int l = 0, r = sz(odd) - 1, answer = 0;
	while(l <= r) {
		int mid = (l + r) >> 1;
		if(trial(odd[mid])) maximize(answer, odd[mid]), l = mid + 1;
		else r = mid - 1;
	}

	l = 0, r = sz(even) - 1;
	while(l <= r) {
		int mid = (l + r) >> 1;
		if(trial(even[mid])) maximize(answer, even[mid]), l = mid + 1;
		else r = mid - 1;
	}

	cout << answer << endl;
}

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    #define task "Deeto"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    
    int testcase = 1; // cin >> testcase;    
    for(int i = 1; i <= testcase; i++) {
        input();
        process();
    }

    cerr << "Saa, watashtachi no deeto hajimemashou" << endl;
    cerr << "Atarashii kiseki wo koko kara hajimeru shining place nee mou ichido kimi to..." << endl;
    
    return 0;
}

/*
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*/

Compilation message (stderr)

lampice.cpp: In function 'int32_t main()':
lampice.cpp:214:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  214 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
lampice.cpp:215:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  215 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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