diff options
| -rw-r--r-- | Graph/lca.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Graph/lca.cpp b/Graph/lca.cpp index 2dcd05b..bba90aa 100644 --- a/Graph/lca.cpp +++ b/Graph/lca.cpp @@ -7,12 +7,12 @@ namespace lca { } int lca(vector<int> * G, int u, int v) { if (d[u] > d[v]) swap(u, v); - for (int i = 18; i >= 0; i--) if (d[v] - (1 << i) >= d[u]) v = L[v][i]; + for (int i = 18; i >= 0; --i) if (d[v] - (1 << i) >= d[u]) v = L[v][i]; if (u == v) return u; - 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]; + 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]; return L[u][0]; } inline int dist(vector<int> * G, int u, int v) { - return d[u]+d[v]-2*lca(G, u, v); + return d[u]+d[v]-2*d[lca(G, u, v)]; } } |