184452025-10-22 20:00:57ubormaciHírlánccpp17Accepted 80/8054ms11316 KiB
#include <iostream>
#include <algorithm> // for sort, mainly
#include <vector>
#include <map>
#include <set>
#include <cmath>
#include <array>
#include <string>
#include <cstdio>
#include <iterator>
#include <unordered_set>
#include <cstdint> // for int64_t, int32_t, etc
#include <queue>
#include <stack>
#include <deque>
#include <numeric> // gcd, lcm
#include <fstream>
#include <bitset> // for bitset
#include <iomanip>
#include <cassert> // for set with custom ordering
#include <type_traits> // for set with custom ordering
#include <utility> // for swap, forward, etc
using namespace std;

#pragma GCC optimize("O2")
// #pragma GCC optimize("O1","O2","O3","Ofast","unroll-loops")
//#pragma GCC target("sse","sse2","sse3","sse4.1","sse4.2","avx","avx2","fma")

template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ", " << p.second << ')'; }
template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) { os << '{'; string sep; for (const T &x : v) os << sep << x, sep = ", "; return os << '}'; }
void dbg_out() { cout << endl; }
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cout << ' ' << H; dbg_out(T...); }
#ifdef LOCAL
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

/*
 *
 * notes:
 *
 * int64_t
 * stoi(string s) -> string to int
 * to_string() -> int (or else) to string
 *
 * vector declaration:
 * vector<ll> v(n, 0)
 * vector<vector<ll>> v(n, vector<ll>(n, 0));
 *
 * {if statement} ? {truth value} : {false value}
 *
 * set lower bound/upper bound:
 * 	// . . . m1 . . . d . . . . m2
 *    auto m1_it = b.lower_bound(d);
 *    advance(m1_it, -1);
 *    m1 = *m1_it;
 *	m2 = *b.upper_bound(d);
 *
 * #ifdef LOCAL
 *    freopen("in.txt","r",stdin);
 *    freopen("out.txt","w",stdout);
 * #endif
 *
 * constexpr auto lcm(auto x, auto... xs)
 * {
 *	return ((x = std::lcm(x, xs)), ...);
 * }
 *
 * std::gcd(int a, int b)
 *
 * cout << setprecision(n);
 *
 * set with custom ordering
 * set<ll, decltype(&cmp)> qu(cmp);
 *
 */

typedef int64_t ll;

ll n;

vector<ll> to;
vector<ll> proc;
vector<ll> d;

void dfs(ll curr) {

    proc[curr] = 1;

    //cerr << "\ncurr=" << curr;

    //cerr << "\nproc[" <<to[curr] << "]=" << proc[to[curr]];

    if(proc[to[curr]] == 0) {
        dfs(to[curr]);
    }else if(proc[to[curr]] == 2) {
        d[curr] = d[to[curr]] + 1;
    }else {
        // cycle
        ll j = to[curr];
        ll clen = 1;    
        while(j != curr) {
            j = to[j];
            clen++;
        }
        
        proc[curr] = 2;
        d[curr] = clen;
        j = to[curr];
        while(j != curr) {
            proc[j] = 2;
            d[j] = clen;
            j = to[j];
        }

        return;
    }

    if(proc[curr] == 1) {
        d[curr] = d[to[curr]] + 1;
    }

    proc[curr] = 2;
}

void solve() {

    cin >> n;
    to.resize(n+1);
    for(ll i = 1; i <= n; i++) {
        cin >> to[i];
    }

    //cerr << "\nto=" << to;

    proc.resize(n+1, 0);
    d.resize(n+1, 1);

    for(ll i = 1; i <= n; i++) {
        if(proc[i] == 0) {
            //cerr << "\nstart " << i;
            dfs(i);
            //cerr << "\nproc=" << proc;
            //cerr << "\nd=" << d;
        }
    }

    //cerr << "\nproc=" << proc;
    //cerr << "\nd=" << d;

    ll mx = 0;
    ll mind = 0;
    for(ll i = 1; i <= n; i++) {
        if(d[i] > mx) {
            mx = d[i];
            mind = i;
        }
    }

    cout << mind << " " << mx;

}

int main()
{
    std::ios_base::sync_with_stdio(false);
    //cin.tie(nullptr);
    //cout.tie(nullptr);

    solve();

    return 0;
}
SubtaskSumTestVerdictTimeMemory
subtask10/0
1Accepted1ms316 KiB
subtask220/20
2Accepted2ms500 KiB
3Accepted1ms500 KiB
4Accepted1ms316 KiB
5Accepted2ms316 KiB
6Accepted1ms512 KiB
7Accepted1ms316 KiB
8Accepted1ms316 KiB
9Accepted1ms316 KiB
10Accepted1ms316 KiB
11Accepted1ms500 KiB
12Accepted1ms316 KiB
subtask318/18
13Accepted43ms5064 KiB
14Accepted46ms4916 KiB
15Accepted43ms5328 KiB
16Accepted46ms5488 KiB
17Accepted54ms6968 KiB
18Accepted52ms7128 KiB
19Accepted54ms7120 KiB
20Accepted52ms7220 KiB
21Accepted54ms10036 KiB
22Accepted54ms11316 KiB
subtask442/42
23Accepted1ms316 KiB
24Accepted2ms500 KiB
25Accepted1ms500 KiB
26Accepted1ms316 KiB
27Accepted2ms316 KiB
28Accepted1ms512 KiB
29Accepted1ms316 KiB
30Accepted1ms316 KiB
31Accepted1ms316 KiB
32Accepted1ms316 KiB
33Accepted1ms500 KiB
34Accepted1ms316 KiB
35Accepted43ms5064 KiB
36Accepted46ms4916 KiB
37Accepted43ms5328 KiB
38Accepted46ms5488 KiB
39Accepted54ms6968 KiB
40Accepted52ms7128 KiB
41Accepted54ms7120 KiB
42Accepted52ms7220 KiB
43Accepted54ms10036 KiB
44Accepted54ms11316 KiB
45Accepted39ms4916 KiB
46Accepted39ms4916 KiB
47Accepted39ms5172 KiB
48Accepted41ms5172 KiB
49Accepted41ms5440 KiB
50Accepted43ms5940 KiB
51Accepted43ms5940 KiB
52Accepted41ms5920 KiB
53Accepted41ms6452 KiB
54Accepted41ms7120 KiB