Submission #1084585

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084585		SamueleVid	Rarest Insects (IOI22_insects)	C++17	Compilation error	0 ms	0 KiB

insects

#include <bits/stdc++.h>
using namespace std;

constexpr int MAXN = 1e5 + 5;
vector<int> adj[MAXN];
bool v[MAXN];

bool ciclo = 0;

int dfs(int u, int p) {
    if (v[u]) ciclo = 1;
    v[u] = 1;

    bool tolto_p = 0;
    for (auto x : adj[u]) {
        if (x == p && !tolto_p) {
            tolto_p = 1;
            continue;
        }
        dfs(x, u);
    }
}   

variant<bool, vector<int>> find_journey(int N, int M, vector<int> U, vector<int> V) {
    fill(v, v + MAXN, 0);
    for (int i = 0; i < M; i ++) {
        adj[U[i]].push_back(V[i]);
    }

    dfs(0, -1);
    return ciclo;
}

Compilation message (stderr)

insects.cpp: In function 'int dfs(int, int)':
insects.cpp:22:1: warning: no return statement in function returning non-void [-Wreturn-type]
   22 | }
      | ^
/usr/bin/ld: /tmp/ccG73Ti5.o: in function `main':
stub.cpp:(.text.startup+0x61): undefined reference to `min_cardinality(int)'
collect2: error: ld returned 1 exit status