제출 #1024520

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1024520		mansur	수천개의 섬 (IOI22_islands)	C++17	1.75 / 100	24 ms	15756 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;
int is = 0;

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

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});
    int cnt = 0;
    for (auto [to, id]: g[0]) {
        was[0] = 1;
        is = 0;
        dfs(to, id ^ 1);
        if (is) cnt++;
        if (sz(s)) return true;
        for (int i = 0; i < n; i++) {
            was[i] = 0;
        }
    }
    return cnt > 1;
    reverse(all(s));
    vector<int> ans;
    for (int x: s) ans.push_back(x);

}

• Subtask 1: 0 / 5
• Subtask 2: 1.75 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45