제출 #772465

#제출 시각아이디문제언어결과실행 시간메모리
772465khshg기지국 (IOI20_stations)C++14
52.32 / 100
718 ms852 KiB
#include"stations.h" #include<bits/stdc++.h> using namespace std; vector<vector<int>> adj; vector<int> L, R, sz; void dfs(int s, int p, int low) { L[s] = low; sz[s] = 1; for(auto& u : adj[s]) { if(u == p) continue; dfs(u, s, low + sz[s] - 1); sz[s] += sz[u]; } R[s] = low + sz[s] - 1; } pair<int, int> conv(int s) { return {s % 1000, s / 1000}; } int conv(pair<int, int> s) { return s.first + s.second * 1000; } vector<int> label(int N, int K, vector<int> u, vector<int> v) { sz.resize(N); L.resize(N); R.resize(N); adj.resize(N); for(auto& I : adj) I.clear(); for(int i = 0; i < (int)u.size(); ++i) { adj[u[i]].push_back(v[i]); adj[v[i]].push_back(u[i]); } dfs(0, -1, 0); vector<int> labels(N); for(int i = 0; i < N; ++i) labels[i] = conv({L[i], R[i]}); return labels; } int find_next_station(int s, int t, vector<int> c) { pair<int, int> S = conv(s), T = conv(t); vector<pair<int, int>> C((int)c.size()); for(int i = 0; i < (int)c.size(); ++i) C[i] = conv(c[i]); int par = -1, ans = -1; for(int i = 0; i < (int)c.size(); ++i) { if(C[i].first <= S.first && C[i].second >= S.second) par = i; else if(C[i].first <= T.second && C[i].second >= T.second) ans = i; } return (ans == -1 ? conv(C[par]) : conv(C[ans])); }
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