Submission #1218949

#	Time	Username	Problem	Language	Result	Execution time	Memory
1218949		im2xtreme	Longest Trip (IOI23_longesttrip)	C++20	Compilation error	0 ms	0 KiB

longesttrip

#include <vector>
using namespace std;

vector<bool> visited;
vector<int> current_path, best_path;

void dfs(int u, const vector<vector<int>>& adj) {
    visited[u] = true;
    current_path.push_back(u);

    if (current_path.size() > best_path.size()) {
        best_path = current_path;
    }

    for (int v : adj[u]) {
        if (!visited[v]) {
            dfs(v, adj);
        }
    }

    visited[u] = false;
    current_path.pop_back();
}

int* longest_trip(int N, int D) {
    vector<vector<int>> adj(N);

    for (int current = 0; current < N; current++) {
        for (int i = current + 1; i < N; i++) {
            if (are_connected({current}, {i})) {
                adj[current].push_back(i);
                adj[i].push_back(current);
            }
        }
    }

    visited = vector<bool>(N, false);
    best_path.clear();

    for (int i = 0; i < N; i++) {
        current_path.clear();
        dfs(i, adj);
    }

    int* result = new int[best_path.size()];
    for (int i = 0; i < (int)best_path.size(); ++i) {
        result[i] = best_path[i];
    }

    return result;
}

Compilation message (stderr)

longesttrip.cpp: In function 'int* longest_trip(int, int)':
longesttrip.cpp:30:17: error: 'are_connected' was not declared in this scope
   30 |             if (are_connected({current}, {i})) {
      |                 ^~~~~~~~~~~~~