Submission #878919

#	Time	Username	Problem	Language	Result	Execution time	Memory
878919		thinknoexit	Longest Trip (IOI23_longesttrip)	C++17	5 / 100	753 ms	856 KiB

longesttrip

#include <bits/stdc++.h>
#include "longesttrip.h"
using namespace std;
using ll = long long;
int n, d;
bool adj[256][256];
int cnt[256];
vector<int> longest_trip(int N, int D) {
    n = N;
    d = D;
    for (int i = 0;i < n;i++) {
        adj[i][i] = 1;
        for (int j = i + 1;j < n;j++) {
            adj[i][j] = adj[j][i] = are_connected({ i }, { j });
        }
    }
    vector<int> a, b, g1, g2;
    for (int i = 0;i < n;i++) {
        if (adj[0][i]) g1.push_back(i);
        else g2.push_back(i);
    }
    memset(cnt, 0, sizeof cnt);
    for (auto& x : g1) {
        for (auto& y : g2) {
            if (adj[x][y]) cnt[x]++;
        }
    }
    int mx = 0;
    for (auto& x : g1) {
        mx = max(mx, cnt[x]);
    }

    for (auto& x : g1) {
        if (cnt[x] == mx) b.push_back(x);
        else a.push_back(x);
    }
    for (auto& x : g2) b.push_back(x);
    for (auto& x : a) {
        for (auto& y : b) {
            if (adj[x][y]) {
                vector<int> ans;
                for (auto& xx : a) {
                    if (xx != x) ans.push_back(xx);
                }
                ans.push_back(x);
                ans.push_back(y);
                for (auto& yy : b) {
                    if (yy != y) ans.push_back(yy);
                }
                return ans;
            }
        }
    }
    if (a.size() > b.size()) return a;
    return b;
}

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