#include<bits/stdc++.h>
using namespace std;
#define IOS ios::sync_with_stdio(false);; cin.tie(NULL)
void selfMax(long long& a, long long b){
a = max(a, b);
}
void selfMin(long long& a, long long b){
a = min(a, b);
}
template<typename T> istream& operator>>(istream& in, vector<T>& a) {for(auto &x : a) in >> x; return in;};
template<typename T1, typename T2> istream& operator>>(istream& in, pair<T1, T2>& x) {return in >> x.first >> x.second;}
template<typename T1, typename T2> ostream& operator<<(ostream& out, const pair<T1, T2>& x) {return out << x.first << ' ' << x.second;}
template<typename T> ostream& operator<<(ostream& out, vector<T>& a) {for(auto &x : a) out << x << ' '; return out;};
template<typename T> ostream& operator<<(ostream& out, vector<vector<T> >& a) {for(auto &x : a) out << x << '\n'; return out;};
template<typename T1, typename T2> ostream& operator<<(ostream& out, vector<pair<T1, T2> >& a) {for(auto &x : a) out << x << '\n'; return out;};
/*
Use DSU dsu(N);
*/
struct DSU {
vector<long long> adj2;
DSU(long long N) { adj2 = vector<long long>(N, -1); }
// get representive component (uses path compression)
long long get(long long x) { return adj2[x] < 0 ? x : adj2[x] = get(adj2[x]); }
bool same_set(long long a, long long b) { return get(a) == get(b); }
long long size(long long x) { return -adj2[get(x)]; }
bool unite(long long x, long long y) { // union by size
x = get(x), y = get(y);
if (x == y) return false;
if (adj2[x] > adj2[y]) swap(x, y);
adj2[x] += adj2[y]; adj2[y] = x;
return true;
}
};
/*
Run with Bit<long long> BIT
*/
template <class T> class BIT {
private:
long long size;
vector<T> bit;
vector<T> arr;
public:
BIT(long long size) : size(size), bit(size + 1), arr(size) {}
void set(long long ind, long long val) { add(ind, val - arr[ind]); }
void add(long long ind, long long val) {
arr[ind] += val;
ind++;
for (; ind <= size; ind += ind & -ind) { bit[ind] += val; }
}
T pref_sum(long long ind) {
ind++;
T total = 0;
for (; ind > 0; ind -= ind & -ind) { total += bit[ind]; }
return total;
}
};
/*
Change Comb for specific Seg tree probs, but run with Seg<long long> Seg;
*/
template<class T> struct Seg {
const T ID = 1e18; T comb(T a, T b) { return min(a,b); }
long long n; vector<T> seg;
void init(long long _n) { n = _n; seg.assign(2*n,ID); }
void pull(long long p) { seg[p] = comb(seg[2*p],seg[2*p+1]); }
void upd(long long p, T val) {
seg[p += n] = val; for (p /= 2; p; p /= 2) pull(p); }
T query(long long l, long long r) {
T ra = ID, rb = ID;
for (l += n, r += n+1; l < r; l /= 2, r /= 2) {
if (l&1) ra = comb(ra,seg[l++]);
if (r&1) rb = comb(seg[--r],rb);
}
return comb(ra,rb);
}
};
const int N = 1000, M = 100000;
int a[M], b[M], c[2][M];
bool adj2[N][N];
vector<pair<int, int>> adj[N];
vector<pair<int, int>> adj3[2][M];
vector<int> st;
int visited[2][M];
void dfs(int t, int u, pair<int, int> p) {
visited[t][u] = 1;
st.emplace_back(c[t][u]);
for (auto v: adj3[t][u]) {
if (v != p) {
if (visited[v.first][v.second] == 1) {
cout << c[v.first][v.second] + 1 << " ";
int cur = c[v.first][v.second];
int val = 0;
while (true) {
auto u = st.back();
cout << u + 1 << " ";
if (val && adj2[u][cur]) {
break;
}
val++;
st.pop_back();
}
exit(0);
}
}
}
for (auto v : adj3[t][u]) {
if (v != p) {
if (!visited[v.first][v.second]) {
dfs(v.first, v.second, {t, u});
}
}
}
visited[t][u] = 2;
st.pop_back();
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, r;
cin >> n >> r;
for (int i = 0; i < r; ++i) {
cin >> a[i] >> b[i];
--a[i], --b[i];
c[0][i] = a[i];
c[1][i] = b[i];
adj[a[i]].emplace_back(b[i], i);
adj[b[i]].emplace_back(a[i], i);
adj2[a[i]][b[i]] = adj2[b[i]][a[i]] = true;
}
for (int u = 0; u < n; ++u) {
for (int i = 0; i < (int)adj[u].size(); i++) {
for(int j = 0; j < (int)adj[u].size(); j++){
if (i != j && !adj2[adj[u][i].first][adj[u][j].first]) {
int t1 = (b[adj[u][i].second] == adj[u][i].first);
int t2 = (b[adj[u][j].second] == u);
adj3[t1][adj[u][i].second].emplace_back(t2, adj[u][j].second);
}
}
}
}
for (int u = 0; u < r; ++u) {
if (!visited[0][u]) {
dfs(0, u, {-1, -1});
}
if (!visited[1][u]) {
dfs(1, u, {-1, -1});
}
}
cout << "no";
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 2 |
Correct |
2 ms |
5008 KB |
Output is correct |
| 3 |
Correct |
2 ms |
5052 KB |
Output is correct |
| 4 |
Correct |
2 ms |
5052 KB |
Output is correct |
| 5 |
Correct |
2 ms |
4948 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
5076 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
5076 KB |
Output is correct |
| 2 |
Correct |
3 ms |
5076 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
5204 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
5588 KB |
Output is correct |
| 2 |
Correct |
5 ms |
5696 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
5844 KB |
Output is correct |
| 2 |
Correct |
4 ms |
5844 KB |
Output is correct |
| 3 |
Correct |
9 ms |
9684 KB |
Output is correct |
| 4 |
Correct |
15 ms |
9756 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
8272 KB |
Output is correct |
| 2 |
Correct |
7 ms |
8532 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
85 ms |
36172 KB |
Output is correct |
| 2 |
Correct |
22 ms |
12220 KB |
Output is correct |
| 3 |
Correct |
98 ms |
36820 KB |
Output is correct |
| 4 |
Correct |
22 ms |
12300 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
83 ms |
95128 KB |
Output is correct |
| 2 |
Correct |
118 ms |
103536 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
109 ms |
9692 KB |
Output is correct |
| 2 |
Correct |
112 ms |
10332 KB |
Output is correct |
| 3 |
Correct |
201 ms |
172804 KB |
Output is correct |
| 4 |
Correct |
235 ms |
173008 KB |
Output is correct |
