Submission #1037520

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037520		12345678	Thousands Islands (IOI22_islands)	C++17	9.10 / 100	23 ms	4952 KiB

islands

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

using namespace std;

const int nx=1e3+5;

int ans, vs[nx];
vector<int> d[nx];

void dfs(int u, int p)
{
    vs[u]=1;
    if (d[u].size()-(u!=p)>=2) ans=1;
    for (auto v:d[u]) if (v!=p&&!vs[v]) dfs(v, u);
}

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+=2) d[U[i]].push_back(V[i]), d[V[i]].push_back(U[i]);
    dfs(0, 0);
    if (ans) return vector<int> {};
    return false;
}

• Subtask 1: 0 / 5
• Subtask 2: 1.75 / 5
• Subtask 3: 7.35 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45