이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "islands.h"
#include<bits/stdc++.h>
using namespace std;
vector<vector<pair<int, int>>> adj;
vector<int> c;
bool dfs(int s, vector<int>& nds) {
nds.push_back(s);
c[s] = 1;
for(auto& u : adj[s]) {
if(c[u.first] == 0) {if(dfs(u.first, nds)) return 1;}
else if(c[u.first] == 1) {
nds.push_back(u.first);
return 1;
}
}
nds.pop_back();
nds[s] = 2;
return false;
}
variant<bool, vector<int>> find_journey(int N, int M, vector<int> U, vector<int> V) {
//vector<int> find_journey(int N, int M, vector<int> U, vector<int> V) {
c.resize(N);
adj.resize(N);
for(int i = 0; i < M; i += 2) {
adj[U[i]].emplace_back(V[i], i);
}
vector<int> ans;
vector<int> nds;
return dfs(0, nds);
/* int cur = 0, prev = -1;
vector<int> way, ans;
while(1) {
int cs = out[cur] - (prev != -1);
if(cs == 0) return false;
if(cs == 1) {
for(auto& u : adj[cur]) if(u.first != prev) {
way.push_back(u.second[0]);
prev = cur;
cur = u.first;
break;
}
continue;
}
break;
}
//return true;
ans = way;
vector<pair<int, int>> z;
for(auto& u : adj[cur]) if(u.first != prev) {
for(auto& v : u.second) {
z.push_back(v);
if((int)z.size() == 2) break;
}
if((int)z.size() == 2) break;
}
ans.push_back(z[0]);
ans.push_back(z[0] / 2 * 4 + 1 - z[0]);
ans.push_back(z[1]);
ans.push_back(z[1] / 2 * 4 + 1 - z[1]);
ans.push_back(z[0] / 2 * 4 + 1 - z[0]);
ans.push_back(z[0]);
ans.push_back(z[1] / 2 * 4 + 1 - z[1]);
ans.push_back(z[1]);
reverse(begin(way), end(way));
for(auto& u : way) ans.push_back(u);
return ans;*/
}
/*
int main() {
int N, M;
assert(2 == scanf("%d %d", &N, &M));
std::vector<int> U(M), V(M);
for (int i = 0; i < M; ++i) {
assert(2 == scanf("%d %d", &U[i], &V[i]));
}
vector<int> result = find_journey(N, M, U, V);
for(auto& u : result) {
cout << u << '\n';
}
}*/
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