feat: simplify
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@ -26,11 +26,9 @@ public:
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std::function<int(int)> dfs = [&](int cur) {
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vis[cur] = true;
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int ret = 0;
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for (int nx : vs[cur]) {
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if (vis[std::abs(nx)])
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continue;
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for (int nx : vs[cur])
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if (!vis[std::abs(nx)])
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ret += (nx < 0) + dfs(std::abs(nx));
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}
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return ret;
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};
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return dfs(0);
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