Submission #236816

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
236816	2020-06-03 13:17:30	Autoratch	One-Way Streets (CEOI17_oneway)	C++14	100 / 100	518 ms	41592 KiB

oneway

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#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 1;
const int K = 19;
int n,m,p;
vector<int> adj[N];
map<pair<int,int>,int> mul; 
map<pair<int,int>,pair<int,char> > hsh;
bool visited[N];
int res[N],lv[N],dp[K][N];
int rec[N];
string ans;
void dfs(int u,int p)
{
    if(visited[u]) return;
    visited[u] = true;
    lv[u] = lv[p]+1,dp[0][u] = p;
    for(int v : adj[u]) if(v!=p) dfs(v,u);
}
int lca(int a,int b)
{
    if(lv[a]<lv[b]) swap(a,b);
    for(int i = K-1;i >= 0;i--) if(lv[dp[i][a]]>=lv[b]) a = dp[i][a];
    if(a==b) return a;
    for(int i = K-1;i >= 0;i--) if(dp[i][a]!=dp[i][b]) a = dp[i][a],b = dp[i][b];
    return dp[0][a];
 
 
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• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40