Submission #1176396

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1176396	2025-03-30 21:17:53	igofan	Mergers (JOI19_mergers)	C++20	56 / 100	3094 ms	32584 KiB

mergers

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#include <bits/stdc++.h>
using namespace std;
vector<vector<int>> adj, parent;
vector<int> depth;
void dfs(int node, int prev, int dis) {
    depth[node] = dis;
    parent[node][0] = prev;
    for(auto child: adj[node]) if (child != prev) dfs(child, node, dis+1);
}
int ancestor(int x, int k) {
    int cnt = 0;
    while(k && x) {
        if (k&1) x = parent[x][cnt];
        k = k>>1; cnt++;
    }
    return x;
}
int lca(int a, int b) {
    if (depth[a] < depth[b]) swap(a, b);
    a = ancestor(a, depth[a]-depth[b]);
    if (a==b) return a;
    for(int k=19; k>=0; k--) {
        int aa = parent[a][k];
        int bb = parent[b][k];
        if (aa != bb) {
            a = aa; b = bb;
        }
    }
 
 
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• Subtask 1: 10 / 10
• Subtask 2: 24 / 24
• Subtask 3: 0 / 14
• Subtask 4: 22 / 22
• Subtask 5: 0 / 30