제출 #1077002

#제출 시각아이디문제언어결과실행 시간메모리
1077002mariaclara수천개의 섬 (IOI22_islands)C++17
8.40 / 100
30 ms6492 KiB
#include "islands.h" #include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<int,int> pii; #define all(x) x.begin(), x.end() #define sz(x) (int)x.size() #define pb push_back #define mk make_pair #define fr first #define sc second vector<int> vis, block; vector<vector<pii>> edges; vector<int> dfs(int x) { vis[x] = 1; for(auto [viz,ind] : edges[x]) { if(block[viz]) continue; if(vis[viz]) return {ind}; vector<int> v = dfs(viz); if(!v.empty()) {v.pb(ind); return v;} } block[x] = 1; return {}; } variant<bool, vector<int>> find_journey(int N, int M, vector<int> U, vector<int> V) { edges.resize(N); vis.resize(N); block.resize(N); for(int i = 0; i < M; i += 2) edges[U[i]].pb({V[i], i}); vector<int> c = dfs(0), ans; if(c.empty()) return false; reverse(all(c)); int x = V[c.back()], m = 0; for(int i = sz(c) - 1; i >= 0; i--) if(U[i] == x) m = i; // PARTE 1 for(int i = 0; i < sz(c); i++) ans.pb(c[i]); for(int i = m-1; i >= 0; i--) ans.pb(c[i]); // PARTE 2 for(int i = 0; i < sz(c); i++) ans.pb(c[i] + 1); for(int i = m-1; i >= 0; i--) ans.pb(c[i] + 1); // PARTE 3 for(int i = 0; i < m; i++) ans.pb(c[i]); for(int i = sz(c) - 1; i >= m; i--) ans.pb(c[i]); for(int i = m-1; i >= 0; i--) ans.pb(c[i]); // PARTE 4 for(int i = 0; i < m; i++) ans.pb(c[i] + 1); for(int i = sz(c) - 1; i >= m; i--) ans.pb(c[i] + 1); for(int i = m-1; i >= 0; i--) ans.pb(c[i] + 1); return ans; }
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