Submission #201015

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
201015	2020-02-09 05:36:35	dolphingarlic	Putovanje (COCI20_putovanje)	C++14	110 / 110	203 ms	28652 KiB

putovanje

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#include <bits/stdc++.h>
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;
int n;
vector<int> graph[200001];
ll bit[200001];
int tin[200001], tout[200001], timer = 0;
int anc[200001][20];
void dfs(int node = 1, int parent = 0) {
    anc[node][0] = parent;
    FOR(i, 1, 20) anc[node][i] = anc[anc[node][i - 1]][i - 1];
    tin[node] = ++timer;
    for (int i : graph[node]) if (i != parent) dfs(i, node);
    tout[node] = timer;
}
bool is_ancestor(int a, int b) { return tin[a] <= tin[b] && tout[a] >= tout[b]; }
int lca(int a, int b) {
    if (is_ancestor(a, b)) return a;
    for (int i = 19; ~i; i--) {
        if (anc[a][i] && !is_ancestor(anc[a][i], b)) a = anc[a][i];
    }
    return anc[a][0];
}
 
 
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• Subtask 1: 20 / 20
• Subtask 2: 25 / 25
• Subtask 3: 65 / 65