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91
LibreOJ/2162/2162.cpp
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91
LibreOJ/2162/2162.cpp
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#include <iostream>
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#include <stack>
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#include <utility>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1e5 + 5,
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M = 1e6 + 5;
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int n, m, d[N], root;
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bool vis[N], in_stack[N], edge_used[M];
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std::stack<int> st;
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std::vector<std::pair<int, int>> g[N];
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std::vector<std::vector<int>> ans;
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void dfs(int u) {
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vis[u] = true;
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for (auto e : g[u]) {
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int v = e.first,
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id = e.second;
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if (edge_used[id]) continue;
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edge_used[id] = true;
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dfs(v);
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}
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if (in_stack[u]) {
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std::vector<int> res{u};
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while (st.top() != u) {
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res.emplace_back(st.top());
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in_stack[st.top()] = false;
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st.pop();
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}
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res.emplace_back(u);
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ans.emplace_back(res);
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} else {
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st.push(u);
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in_stack[u] = true;
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}
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m;
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for (int i = 1, a, b, s, t; i <= m; i++) {
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cin >> a >> b >> s >> t;
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if (s ^ t) {
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g[a].emplace_back(b, i);
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g[b].emplace_back(a, i);
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d[a]++, d[b]++;
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}
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}
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for (int i = 1; i <= n; i++) {
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if (d[i] % 2 != 0) {
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cout << "NIE" << endl;
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exit(0);
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}
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}
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for (int i = 1; i <= n; i++) {
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if (!vis[i]) dfs(i);
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}
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cout << ans.size() << endl;
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for (auto& item : ans) {
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cout << item.size() - 1 << ' ';
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for (int& x : item) {
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cout << x << ' ';
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}
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cout << endl;
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}
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return 0;
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}
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