"centroid of a tree" Code Answer's
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centroid of a tree
Outstanding Ox
on Sep 15, 2020
vector<int> Centroid(const vector<vector<int>> &g) {
int n = g.size();
vector<int> centroid;
vector<int> sz(n);
function<void (int, int)> dfs = [&](int u, int prev) {
sz[u] = 1;
bool is_centroid = true;
for (auto v : g[u]) if (v != prev) {
dfs(v, u);
sz[u] += sz[v];
if (sz[v] > n / 2) is_centroid = false;
}
if (n - sz[u] > n / 2) is_centroid = false;
if (is_centroid) centroid.push_back(u);
};
dfs(0, -1);
return centroid;
}Source: codeforces.com
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