제출 #842930

#제출 시각아이디문제언어결과실행 시간메모리
842930pit4h가장 긴 여행 (IOI23_longesttrip)C++17
30 / 100
9 ms616 KiB
#include<bits/stdc++.h> #include "longesttrip.h" using namespace std; vector<int> longest_trip(int N, int D) { mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); vector<int> path[2]; path[0] = {0}; for (int i = 1; i < N; i++) { bool which = uniform_int_distribution<int>(0, 1)(rng); if (path[which].empty()) { which = !which; } if (are_connected({path[which].back()}, {i})) { path[which].push_back(i); if (!path[!which].empty() && are_connected({path[!which].back()}, {i})) { while (!path[!which].empty()) { path[which].push_back(path[!which].back()); path[!which].pop_back(); } } } else { path[!which].push_back(i); } } if (path[0].empty()) { return path[1]; } if (path[1].empty()) { return path[0]; } // if (are_connected({path[0][0], path[0].back()}, {path[1][0], path[1].back()})) { // vector<int> res; // if (are_connected({path[0][0]}, {path[1][0]})) { // for (int i: path[1]) { // res.push_back(i); // } // reverse(res.begin(), res.end()); // for (int i: path[0]) { // res.push_back(i); // } // } // else if(are_connected({path[0][0]}, {path[1].back()})) { // for (int i: path[1]) { // res.push_back(i); // } // for (int i: path[0]) { // res.push_back(i); // } // } // else if(are_connected({path[0].back()}, {path[1][0]})) { // for (int i: path[0]) { // res.push_back(i); // } // for (int i: path[1]) { // res.push_back(i); // } // } // else { // std::cerr << "connection between backs of paths -- impossible\n"; // assert(false); // } // return res; // } // pair<int, int> connection = find_connection(path[0], path[1]); vector<int> res = (path[0].size() > path[1].size())?path[0] : path[1]; return res; }
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