This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "islands.h"
#include <bits/stdc++.h>
#include <variant>
using namespace std;
variant<bool, vector<int>> find_journey(int N, int M, vector<int> U, vector<int> V) {
if (N == 2) {
vector<int> g[2];
for (int i = 0; i < M; i++)
g[U[i]].push_back(i);
if (g[0].size() < 2 || g[1].empty())
return false;
return vector<int>({g[0][0], g[1][0], g[0][1], g[0][0], g[1][0], g[0][1]});
}
vector<vector<int>> g(N, vector<int>(N, -1));
for (int i = 0; i < M; i++)
g[U[i]][V[i]] = i;
bool isClique = true;
for (int i = 0; i < N && isClique; i++)
for (int j = 0; j < N && isClique; j++)
if (i != j && g[i][j] == -1)
isClique = false;
if (isClique)
return vector<int>({g[0][1], g[1][2], g[2][0], g[0][2], g[2][1], g[1][0],
g[2][0], g[1][2], g[0][1], g[1][0], g[2][1], g[0][2]});
return false;
}
//int main() {
// freopen("../_input", "r", stdin);
// int N, M;
// assert(2 == scanf("%d %d", &N, &M));
//
// vector<int> U(M), V(M);
// for (int i = 0; i < M; ++i) {
// assert(2 == scanf("%d %d", &U[i], &V[i]));
// }
//
// variant<bool, vector<int>> result = find_journey(N, M, U, V);
// if (result.index() == 0) {
// printf("0\n");
// if (get<bool>(result)) {
// printf("1\n");
// } else {
// printf("0\n");
// }
// } else {
// printf("1\n");
// vector<int> &canoes = get<vector<int>>(result);
// printf("%d\n", static_cast<int>(canoes.size()));
// for (int i = 0; i < static_cast<int>(canoes.size()); ++i) {
// if (i > 0) {
// printf(" ");
// }
// printf("%d", canoes[i]);
// }
// printf("\n");
// }
// return 0;
//}
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