#include <bits/stdc++.h>
#include <variant>
using namespace std;
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x << ' '; print(x); cerr << endl;
#else
#define dbg(x)
#endif
void print(int x) {cerr << x;}
void print(long long x) {cerr << x;}
void print(char x) {cerr << x;}
void print(string x) {cerr << x;}
void print(double x) {cerr << x;}
template <class T> void print(vector <T> x);
template <class T> void print(set <T> x);
template <class T> void print(multiset <T> x);
template <class T, class V> void print(pair <T, V> x);
template <class T, class V> void print(map <T, V> x);
template <class T> void print(vector <T> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";}
template <class T> void print(set <T> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";}
template <class T> void print(multiset <T> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";}
template <class T, class V> void print(pair <T, V> x) {cerr << "{"; print(x.first); cerr << ' '; print(x.second); cerr << "}";}
template <class T, class V> void print(map <T, V> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";}
#define ll long long
#define pb push_back
#define ppb pop_back
#define PII pair <int, int>
#define PLL pair <ll, ll>
#define all(v) (v).begin(), (v).end()
#define OK cerr << "OK\n";
#define MP make_pair
const int N0 = 1005, M0 = 2e5 + 5;
int n, m, kayak[N0][N0];
vector <int> u, v;
vector <int> G[N0];
int par[N0];
vector <int> road;
void dfs(int node, int parent){
par[node] = parent;
int children = 0;
for(int u : G[node]){
if(u == parent) continue;
children++;
}
if(children >= 2){
if(road.empty()){
int curr = node;
while(curr != -1){
road.pb(curr);
curr = par[curr];
}
}
return;
}
for(int u : G[node]){
if(u == parent) continue;
dfs(u, node);
}
}
variant <bool, vector <int>> find_journey(int N, int M, vector<int> U, vector<int> V){
n = N, m = M, u = U, v = V;
for(int i = 0; i < M; i++){
G[u[i]].pb(v[i]);
G[v[i]].pb(u[i]);
kayak[u[i]][v[i]] = i;
}
dfs(0, -1);
if(road.empty()) return false;
}
컴파일 시 표준 에러 (stderr) 메시지
islands.cpp: In function 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:75:1: warning: control reaches end of non-void function [-Wreturn-type]
75 | }
| ^
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