Submission #458841

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
458841	2021-08-08 06:29:58	JovanB	Min-max tree (BOI18_minmaxtree)	C++17	100 / 100	633 ms	64584 KiB

minmaxtree

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
const int N = 70000;
const int LOG = 16;
int in[N+5], out[N+5], sz[N+5];
vector <int> graf[N+5];
int par[N+5][LOG+1];
int tjm;
void dfs_lca(int v, int p){
    in[v] = ++tjm;
    sz[v] = 1;
    par[v][0] = p;
    for(int j=1; j<=LOG; j++) par[v][j] = par[par[v][j-1]][j-1];
    for(auto c : graf[v]){
        if(c == p) continue;
        dfs_lca(c, v);
        sz[v] += sz[c];
    }
    out[v] = ++tjm;
}
bool is_parent(int a, int b){
    return a == 0 || (in[a] <= in[b] && out[b] <= out[a]);
 
 
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• Subtask 1: 7 / 7
• Subtask 2: 22 / 22
• Subtask 3: 29 / 29
• Subtask 4: 42 / 42