Submission #1238399

#	Time	Username	Problem	Language	Result	Execution time	Memory
1238399		VahanAbraham	Longest Trip (IOI23_longesttrip)	C++20	40 / 100	367 ms	12476 KiB

longesttrip

#define _CRT_SECURE_NO_WARNINGS
#include "longesttrip.h"
#include <iostream>
#include <string>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <map>
#include <stack>
#include <set>
#include <queue>
#include <deque>
#include <unordered_set>
#include <unordered_map>
#include <math.h>
#include <cmath>
#include <vector>
#include <iomanip>
#include <random>
#include <chrono>
#include <bitset>
#include <cassert>
using namespace std;

#define ll long long
#define fr first
#define sc second
#define pb push_back
#define US freopen(".in", "r", stdin); freopen(".out", "w", stdout);

ll gcd(ll a, ll b)
{
    if (a == 0 || b == 0) {
        return  max(a, b);
    }
    if (a <= b) {
        return gcd(a, b % a);
    }
    else {
        return gcd(a % b, b);
    }
}
ll lcm(ll a, ll b) {
    return (a / gcd(a, b)) * b;
}

const int N = 500005;
const ll oo = 1000000000000000000, MOD = 1000000007;

vector<int> patas, g[N];
bool ok[N];

void dfs(int u) {
    ok[u] = 1;
    patas.pb(u);
    for (int num : g[u]) {
        if (ok[num] == 0) {
            dfs(num);
            break;
        }
    }
}

std::vector<int> longest_trip(int N, int D)
{
    int n = N, d = D;
    for (int i = 0; i < n; ++i) {
        ok[i] = 0;
        g[i].clear();
    }
    patas.clear();
    vector<int> vec;
    if (d == 3) {
        for (int i = 0; i < n; ++i) {
            vec.pb(i);
        }
        return vec;
    }
    int sk1 = 0, mx = 0;
    int mn = n * n + 3;
    vector<int> hnaravora;
    for (int i = 0; i < n; ++i) {
        for (int j = i + 1; j < n; ++j) {
            if (are_connected({ i }, { j }) == 1) {
                g[i].pb(j);
                g[j].pb(i);
                mx = max(mx, (int)g[i].size());
                mx = max(mx, (int)g[j].size());
                mn = min(mx, (int)g[i].size());
                mn = min(mx, (int)g[j].size());
            }
            else {
                if (hnaravora.size() == 0) {
                    hnaravora.pb(i);
                }
            }
        }
    }
    vector<pair<int, int>> sortav;
    for (int i = 0; i < n; ++i) {
        sortav.pb({ g[i].size(),i });
    }
    sort(sortav.begin(), sortav.end());
    int l1 = min(20, (int)sortav.size());
    for (int i = 0; i < l1; ++i) {
        hnaravora.pb(sortav[i].sc);
    }
    int r1 = (max(0, (int)sortav.size() - 20));
    for (int i = 30; i < r1; ++i) {
        hnaravora.pb(sortav[i].sc);
    }
    for (int i = sortav.size() - 1; i >= r1; --i) {
        hnaravora.pb(sortav[i].sc);
    }
    for (int i = hnaravora.size()-1; i >= 0; --i) {
        for (int j = 0; j <= n; ++j) {
            ok[j] = 0;
        }
        patas.clear();
        dfs(hnaravora[i]);
        if (patas.size() > vec.size()) {
            vec.clear();
            vec = patas;
        }
    }
    return vec;
}

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 0 / 60