Submission #395903

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
395903	2021-04-29 07:20:08	Peti	Railway (BOI17_railway)	C++14	100 / 100	137 ms	28056 KiB

railway

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#include <bits/stdc++.h>
using namespace std;
const int logn = 20;
vector<vector<pair<int, int>>> g;
vector<vector<int>> lca;
vector<int> h1, h2, ert;
vector<bool> volt;
int hely = 0;
void bejar(int akt, int os){
    volt[akt] = true;
    h1[akt] = hely++;
    lca[akt][0] = os;
    for(pair<int, int> e : g[akt])
        if(!volt[e.first])
            bejar(e.first, akt);
    h2[akt] = hely++;
    return;
}
int get_lca(int a, int b){
    if(h1[a] > h1[b]) swap(a, b);
    if(h1[a] < h1[b] && h2[b] < h2[a])
        return a;
    for(int i = logn-1; i >= 0; i--)
        if(h2[lca[a][i]] < h2[b])
            a = lca[a][i];
 
 
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• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 7 / 7
• Subtask 4: 29 / 29
• Subtask 5: 16 / 16
• Subtask 6: 25 / 25