"cp algorithm articulation points" Code Answer's
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cp algorithm articulation points
Expensive Elephant
on Aug 26, 2020
int n; // number of nodes
vector<vector<int>> adj; // adjacency list of graph
vector<bool> visited;
vector<int> tin, low;
int timer;
void dfs(int v, int p = -1) {
visited[v] = true;
tin[v] = low[v] = timer++;
int children=0;
for (int to : adj[v]) {
if (to == p) continue;
if (visited[to]) {
low[v] = min(low[v], tin[to]);
} else {
dfs(to, v);
low[v] = min(low[v], low[to]);
if (low[to] >= tin[v] && p!=-1)
IS_CUTPOINT(v);
++children;
}
}
if(p == -1 && children > 1)
IS_CUTPOINT(v);
}
void find_cutpoints() {
timer = 0;
visited.assign(n, false);
tin.assign(n, -1);
low.assign(n, -1);
for (int i = 0; i < n; ++i) {
if (!visited[i])
dfs (i);
}
}
Source: cp-algorithms.com
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