Submission #628640

#TimeUsernameProblemLanguageResultExecution timeMemory
628640dqhungdlThousands Islands (IOI22_islands)C++17
10 / 100
34 ms4424 KiB
#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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