Submission #1236891

#	Time	Username	Problem	Language	Result	Execution time	Memory
1236891		countless	Thousands Islands (IOI22_islands)	C++20	5 / 100	20 ms	7360 KiB

islands

#include "islands.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;

#define sp <<" "<<
#define endl "\n"

variant<bool, vector<int>> find_journey(int N, int M, vector<int> U, vector<int> V) {
    vector<vector<pair<int, int>>> adj(N), rev(N);
    int a, b, c, d, e, f;
    for (int i = 0; i < M; i++) {
        adj[U[i]].emplace_back(V[i], i);
        rev[V[i]].emplace_back(U[i], i);

        if (U[i] == 0 and V[i] == 1) a = i;
        if (U[i] == 1 and V[i] == 0) b = i;
        if (U[i] == 1 and V[i] == 2) c = i;
        if (U[i] == 2 and V[i] == 1) d = i;
        if (U[i] == 2 and V[i] == 0) e = i;
        if (U[i] == 0 and V[i] == 2) f = i;
    }

    vector<int> ans;
    if (N > 2) {
        ans = {a, c, e, f, d, b, e, c, a, b, d, f};
    } else {
        return false;
    }

    return ans;
}

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