제출 #788624

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
788624	2023-07-20 12:20:16	WLZ	Spring cleaning (CEOI20_cleaning)	C++17	100 / 100	146 ms	31220 KiB

cleaning

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#include <bits/stdc++.h>
using namespace std;
 
int max_log, dfs_cnt = 0, e = 0;
vector< vector<int> > g, up, aux;
vector<int> dfs_in, dfs_out, d, s, leaves;
vector<bool> critical;
void dfs(int u, int p) {
  up[u][0] = p;
  dfs_in[u] = dfs_cnt++;
  for (int i = 1; i <= max_log; i++) up[u][i] = up[up[u][i - 1]][i - 1];
  for (auto& v : g[u]) {
    if (v == p) continue;
    d[v] = d[u] + 1;
    dfs(v, u);
    leaves[u] += leaves[v];
  }
  dfs_out[u] = dfs_cnt;
  if ((int) g[u].size() == 1) leaves[u]++;  
}
void dfs2(int u, int p) {
  if (leaves[u] % 2 == 0) e++, s[u]++;
  for (auto& v : g[u]) {
    if (v != p) {
      s[v] += s[u];
      dfs2(v, u);
    }
  }
 
 
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• Subtask 7: 30 / 30