Submission #51196

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
51196	2018-06-17 07:55:12	adamczh1	One-Way Streets (CEOI17_oneway)	C++17	100 / 100	806 ms	89540 KiB

oneway

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#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 5;
int n, m, p;
vector<int> adj[MAXN];
int a[MAXN], b[MAXN];
int x[MAXN], y[MAXN];
map<pair<int, int>, int> cnt;
int Time;
int dfn[MAXN], low[MAXN];
map<pair<int, int>, bool> bridge;
void dfs(int cur, int p = -1) {
  dfn[cur] = low[cur] = ++Time;
  for (int v : adj[cur]) if (v != p) {
    if (!dfn[v]) {
      dfs(v, cur);
      low[cur] = min(low[cur], low[v]);
      if (low[v] > dfn[cur] && cnt[make_pair(cur, v)] == 1) {
        bridge[make_pair(cur, v)] = bridge[make_pair(v, cur)] = true;
      }
    } else if (dfn[v] < dfn[cur]) {
      low[cur] = min(low[cur], dfn[v]);
    }
  }
}
 
 
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• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40