diff --git a/LibreOJ/2162/2162.cpp b/LibreOJ/2162/2162.cpp new file mode 100644 index 00000000..b8545982 --- /dev/null +++ b/LibreOJ/2162/2162.cpp @@ -0,0 +1,91 @@ +#include +#include +#include +#include + +using std::cin; +using std::cout; +const char endl = '\n'; + +const int N = 1e5 + 5, + M = 1e6 + 5; + +int n, m, d[N], root; +bool vis[N], in_stack[N], edge_used[M]; +std::stack st; +std::vector> g[N]; +std::vector> ans; + +void dfs(int u) { + vis[u] = true; + + for (auto e : g[u]) { + int v = e.first, + id = e.second; + + if (edge_used[id]) continue; + edge_used[id] = true; + + dfs(v); + } + + if (in_stack[u]) { + std::vector res{u}; + + while (st.top() != u) { + res.emplace_back(st.top()); + in_stack[st.top()] = false; + st.pop(); + } + + res.emplace_back(u); + ans.emplace_back(res); + } else { + st.push(u); + in_stack[u] = true; + } +} + +int main() { + std::ios::sync_with_stdio(false); + cin.tie(nullptr); + + cin >> n >> m; + + for (int i = 1, a, b, s, t; i <= m; i++) { + cin >> 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