Submission #756840

#	Time	Username	Problem	Language	Result	Execution time	Memory
756840		Nelt	Easter Eggs (info1cup17_eastereggs)	C++17	0 / 100	406 ms	464 KiB

eastereggs

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
#include "grader.h"
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

/* DEFINES */
#define S second
#define F first
#define ll long long
#define ull unsigned long long
#define ld long double
#define npos ULLONG_MAX
#define INF LLONG_MAX
#define vv(a) vector<a>
#define pp(a, b) pair<a, b>
#define pq(a) priority_queue<a>
#define qq(a) queue<a>
#define ss(a) set<a>
#define mm(a, b) map<a, b>
#define ump(a, b) unordered_map<a, b>
#define ANDROID                   \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
#define elif else if
#define endl "\n"
#define allc(a) begin(a), end(a)
#define all(a) a, a + sizeof(a) / sizeof(a[0])
#define pb push_back
#define logi(a) __lg(a)
#define sqrt(a) sqrtl(a)
#define mpr make_pair
#define ins insert
using namespace std;
using namespace __gnu_pbds;
using namespace __cxx11;
typedef char chr;
typedef basic_string<chr> str;
template <typename T, typename key = less<T>>
using ordered_set = tree<T, null_type, key, rb_tree_tag, tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll N = 515;
vv(ll) g[N];
ll sub[N], used[N], tot = 0, d[N], f[N], timer;
void dfs(ll v, ll par = 0)
{
    d[v] = timer++;
    sub[v] = 1;
    for (ll to : g[v])
        if (to != par and !used[to])
            dfs(to, v), sub[v] += sub[to];
    f[v] = timer++;
}
bool parent(ll a, ll b)
{
    return d[a] <= d[b] and f[b] <= f[a];
}
int findEgg(int n, vector<pair<int, int>> e)
{
    for (ll i = 1; i <= n; i++)
        used[i] = 0, g[i].clear();
    for (ll i = 0; i < n - 1; i++)
        g[e[i].F].pb(e[i].S), g[e[i].S].pb(e[i].F);
    tot = n;
    while (tot > 1)
    {
        ll opt = -1, optv = 1, subv = -1e9;
        for (ll i = 1; i <= n; i++)
            if (!used[i])
            {
                timer = 1;
                dfs(i);
                for (ll j = 1; j <= n; j++)
                    if (opt == -1 or (!used[j] and abs(sub[j] - (tot - sub[j])) < abs(subv - (tot - subv))))
                        opt = i, optv = j, subv = sub[j];
            }
        dfs(opt);
        vv(int) v;
        for (ll i = 1; i <= n; i++)
            if (parent(optv, i))
                v.pb(i);
        // cout << opt << " " << optv << " " << subv << " ";
        // for (ll i : v)
        //     cout << i << " ";
        // cout << endl;
        if (query(v))
        {
            for (ll i = 1; i <= n; i++)
                used[i] = 1;
            for (ll i : v)
                used[i] = 0;
        }
        else
            for (ll i : v)
                used[i] = 1;
        tot = 0;
        for (ll i = 1; i <= n; i++)
            tot += !used[i];
    }
    for (ll i = 1; i <= n; i++)
        if (!used[i])
            return i;
}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:106:1: warning: control reaches end of non-void function [-Wreturn-type]
  106 | }
      | ^

• Subtask 1: 0 / 40
• Subtask 2: 0 / 40
• Subtask 3: 0 / 20