제출 #1024509

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1024509		mansur	수천개의 섬 (IOI22_islands)	C++17	0 / 100	22 ms	15964 KiB

islands

#include "islands.h"
#include <bits/stdc++.h>
#include <variant>

using namespace std;

#define rall(s) s.rbegin(), s.rend()
#define all(s) s.begin(), s.end()
#define sz(s) (int) s.size()
#define s second 
#define f first 

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int N = 3e5;

vector<pii> g[N], pr(N);
vector<int> was(N), s;

void dfs(int u) {
    was[u] = 2;
    for (auto [to, id]: g[u]) {
        if (!was[to]) {
            pr[to] = {u, id};
            dfs(to);
            if (sz(s)) return;
        }else if (!to) {
            s.push_back(id);
            while (u) {
                s.push_back(pr[u].s);
                u = pr[u].f;
            }
            return;
        }
    }
    was[u] = 1;
}

variant<bool, vector<int>> find_journey(int n, int m, vector<int> u, vector<int> v) {
    for (int i = 0; i < m; i++) g[u[i]].push_back({v[i], i});
    dfs(0);
    if (!sz(s)) return false;
    return true;
    reverse(all(s));
    vector<int> ans;
    for (int x: s) ans.push_back(x);

}

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