Use struct instead of namespace
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0ba24fbd07
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0f80ef68d7
2 changed files with 15 additions and 17 deletions
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@ -1,4 +1,4 @@
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namespace centroid {
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struct centroid {
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int sz[MN], cpar[MN];
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bitset<MN> vis;
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void dfs(vector<int> * G, int u, int p = 0) {
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@ -1,17 +1,15 @@
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int d[MN], L[MN][20];
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vector<int> G[MN];
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void dfs(int u = 1, int p = 0) {
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d[u] = d[p] + 1;
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L[u][0] = p;
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for (int i = 0; i < 18 && L[u][i]; i++) L[u][i + 1] = L[L[u][i]][i];
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for (auto& v : G[u]) if (v != p) dfs(v, u);
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}
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int lca(int u, int v) {
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if (d[u] > d[v]) swap(u, v);
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for (int i = 18; i >= 0; i--) if (d[v] - (1 << i) >= d[u]) v = L[v][i];
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if (u == v) return u;
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for (int i = 18; i >= 0; i--) if (L[u][i] && L[u][i] != L[v][i]) u = L[u][i], v = L[v][i];
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return L[u][0];
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struct lca {
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int d[MN], L[MN][20];
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void dfs(vector<int> * G, int u = 1, int p = 0) {
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d[u] = d[p] + 1, L[u][0] = p;
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for (int i = 0; i < 18 && L[u][i]; i++) L[u][i + 1] = L[L[u][i]][i];
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for (auto& v : G[u]) if (v != p) dfs(G, v, u);
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}
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int lca(vector<int> * G, int u, int v) {
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if (d[u] > d[v]) swap(u, v);
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for (int i = 18; i >= 0; i--) if (d[v] - (1 << i) >= d[u]) v = L[v][i];
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if (u == v) return u;
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for (int i = 18; i >= 0; i--) if (L[u][i] && L[u][i] != L[v][i]) u = L[u][i], v = L[v][i];
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return L[u][0];
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}
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}
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