제출 #31480

#제출 시각아이디문제언어결과실행 시간메모리
31480cheater2k어르신 집배원 (BOI14_postmen)C++14
55 / 100
524 ms53332 KiB
#include <bits/stdc++.h> using namespace std; const int N = 500010; int n, m; vector < pair<int,int> > G[N]; vector <int> E; bool del[N]; int pos[N]; void dfs(int u) { while(!G[u].empty()) { int id = G[u].back().first, v = G[u].back().second; if (del[id]) { G[u].pop_back(); continue; } else del[id] = 1, dfs(v); } E.push_back(u); } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cin >> n >> m; for (int i = 1; i <= m; ++i) { int u, v; cin >> u >> v; G[u].push_back(make_pair(i,v)); G[v].push_back(make_pair(i,u)); } dfs(1); //for (int u: E) cerr << u << ' '; cerr << endl; stack <int> s; for (int i = 0; i < (int)E.size(); ++i) { int u = E[i]; if (!pos[u]) { pos[u] = i + 1; s.push(i); continue; } else { int stop = pos[u] - 1; while(!s.empty()) { int t = s.top(); printf("%d ", E[t]); pos[E[t]] = 0; s.pop(); if (t == stop) break; } printf("\n"); s.push(i); pos[u] = i + 1; } } }
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