Submission #1215111

#	Time	Username	Problem	Language	Result	Execution time	Memory
1215111		dosts	수천개의 섬 (IOI22_islands)	C++20	1.75 / 100	32 ms	31560 KiB

islands

#include "islands.h"
#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
//#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " <<
#define all(x) x.begin(),x.end()
#define big(x) ((int)(x.size()))
using namespace std;
const int MOD = 1e9+7, LIM = 1e6+1, inf = 2e9;

vi edges[LIM],vis(LIM,0);
int found =0;

void dfs(int node,int p = -1) {
  if (vis[node]) return;
  vis[node] = 1;
  for (auto it : edges[node]) {
    if (it == p) continue;
    if (!it) {
      found = 1;
      return;
    }
    dfs(it,node);
  }
}
std::variant<bool, std::vector<int>> find_journey(int N, int M, std::vector<int> U, std::vector<int> V) {
  for (int i = 0;i<M;i++) {
    edges[U[i]].push_back(V[i]);
  }
  dfs(0);
  if (found) return vi{0};
  return false;
}

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