Submission #171297

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
171297	2019-12-28 08:51:47	parsa_mobed	Railway (BOI17_railway)	C++14	100 / 100	231 ms	26336 KiB

railway

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#include <bits/stdc++.h>
using namespace std;
#define pii pair <int , int>
#define F first
#define S second
const int N = 2e5 + 10, LOG = 20;
int h[N], par[N][LOG], cnt[N], val[N], st[N], timer = 0;
vector <pii> g[N];
void dfs(int v, int pr = 0)
{
    h[v] = h[pr] + 1;
    st[v] = timer++;
    par[v][0] = pr;
    for (int i = 1; i < LOG; i++) par[v][i] = par[par[v][i - 1]][i - 1];
    for (auto p : g[v]) if (p.F != pr) dfs(p.F, v);
}
int getpar(int v, int height)
{
    for (int i = 0; i < LOG; i++) if (height & (1 << i)) v = par[v][i];
    return v;
}
int LCA(int u, int v)
{
    if (h[v] < h[u]) swap(u, v);
    v = getpar(v, h[v] - h[u]);
 
 
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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