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void tarjan(int u, int p)
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{
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dfn[u] = low[u] = ++idx;
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for (int e = head[u]; e; e = next[e])
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if (!dfn[to[e]])
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tarjan(to[e], u), low[u] = min(low[u], low[to[e]]);
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else if (to[e] != p)
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low[u] = min(low[u], dfn[to[e]]);
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} |
