제출 #919671

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
919671	2024-02-01 11:24:54	12345678	Mergers (JOI19_mergers)	C++17	100 / 100	1066 ms	112976 KiB

mergers

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#include <bits/stdc++.h>
using namespace std;
const int nx=5e5+5, kx=19;
int lvl[nx], pa[nx][kx], n, k, u, v, s[nx], l[nx], cnt, dp[nx], ed[nx], ans, t[nx];
vector<int> d[nx];
void dfs(int u, int p)
{
    lvl[u]=lvl[p]+1; pa[u][0]=p;
    for (int i=1; i<kx; i++) pa[u][i]=pa[pa[u][i-1]][i-1];
    for (auto v:d[u]) if (v!=p) dfs(v, u);
}
int lca(int u, int v)
{
    if (u==0) return v;
    if (lvl[u]>lvl[v]) swap(u, v);
    for (int i=kx-1; i>=0; i--) if (lvl[pa[v][i]]>=lvl[u]) v=pa[v][i];
    if (u==v) return u;
    for (int i=kx-1; i>=0; i--) if (pa[u][i]!=pa[v][i]) u=pa[u][i], v=pa[v][i];
    return pa[u][0];
}
void dfs2(int u, int p)
{
    for (auto v:d[u]) if (v!=p) dfs2(v, u), dp[u]+=dp[v];
    if (dp[u]==0) ed[u]=1;
}
 
 
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• Subtask 1: 10 / 10
• Subtask 2: 24 / 24
• Subtask 3: 14 / 14
• Subtask 4: 22 / 22
• Subtask 5: 30 / 30