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1184. 欧拉回路
https://www.acwing.com/problem/content/submission/code_detail/14914342/
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AcWing/1184/1184.cpp
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94
AcWing/1184/1184.cpp
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#include <iostream>
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#include <cstring>
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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 = 2e5 + 5;
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int t, n, m, cnt, ans[M];
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int idx, head[N], edge[M << 1], next[M << 1];
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int din[N], dout[N];
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bool vis[M << 1];
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void add(int u, int v) {
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next[idx] = head[u];
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edge[idx] = v;
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head[u] = idx++;
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}
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void dfs(int u) {
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for (int &i = head[u]; ~i;) {
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if (vis[i]) {
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i = next[i];
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continue;
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}
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int v = edge[i];
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vis[i] = true;
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if (t == 1) vis[i ^ 1] = true;
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int x;
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if (t == 1) x = i & 1 ? -(i >> 1) - 1 : (i >> 1) + 1;
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else x = i + 1;
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i = next[i];
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dfs(v);
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ans[++cnt] = x;
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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 >> t >> n >> m;
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memset(head, 0xff, sizeof(head));
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for (int i = 1, u, v; i <= m; i++) {
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cin >> u >> v;
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add(u, v);
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if (t == 1) add(v, u);
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din[u]++, dout[v]++;
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}
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for (int i = 1; i <= n; i++) {
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if (t == 1 && (din[i] + dout[i] & 1) || t == 2 && (din[i] != dout[i])) {
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cout << "NO" << 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 (~head[i]) {
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dfs(i);
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break;
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}
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}
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if (cnt < m) {
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cout << "NO" << endl;
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exit(0);
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}
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cout << "YES" << endl;
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for (int i = cnt; i; i--) {
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cout << ans[i] << ' ';
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}
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cout << endl;
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return 0;
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}
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