#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (ll)(r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= (ll)(l); --x)
typedef long long ll;
typedef std::pair<int, int> pii;
typedef std::pair<ll , ll > pll;
using namespace std;
const int N = 100010;
const int lg = 18;
int sz[N];
int anc[N][lg];
int height[N];
vector<pii> A[N];
bool ans[N];
int buf[N];
vector<pii> edges;
int n, m;
void dfs(int v, int p, int h)
{
height[v] = h;
anc[v][0] = p;
Loop (i,0,lg-1)
anc[v][i+1] = anc[anc[v][i]][i];
for (auto [u, e] : A[v])
if (u != p)
dfs(u, v, h);
}
int lca(int v, int u)
{
if (height[v] < height[u])
swap(v, u);
int dif = height[v] - height[u];
Loop (i,0,lg) {
if (dif & (1<<i))
v = anc[v][i];
}
if (v == u)
return v;
LoopR (i,0,lg) {
if (anc[v][i] != anc[u][i]) {
v = anc[v][i];
u = anc[u][i];
}
}
return anc[v][0];
}
int flush(int v, int pe)
{
int ans = buf[v];
buf[v] = 0;
for (auto [u, e] : A[v]) {
if (e != pe)
ans += flush(u, e);
}
if (pe >= 0)
::ans[pe] |= ans;
return ans;
}
int main()
{
cin.tie(0) -> sync_with_stdio(false);
cin >> n >> m;
Loop (i,0,n) {
Loop (j,0,lg)
anc[i][j] = i;
sz[i] = 1;
}
Loop (i,0,m) {
int v, u;
cin >> v >> u;
--v; --u;
if (anc[v][lg-1] == anc[u][lg-1]) {
buf[v] += 1;
buf[u] += 1;
buf[lca(v, u)] -= 2;
} else {
if (sz[anc[v][lg-1]] < sz[anc[u][lg-1]])
swap(v, u);
flush(anc[u][lg-1], -1);
A[v].push_back({u,edges.size()});
A[u].push_back({v,edges.size()});
edges.push_back({v, u});
sz[anc[v][lg-1]] += sz[anc[u][lg-1]];
dfs(u, v, height[v]+1);
}
}
Loop (i,0,n)
if (anc[i][lg-1] == i)
flush(i, -1);
Loop (i,0,edges.size()) {
if (!ans[i]) {
cout << edges[i].first+1 << ' ';
cout << edges[i].second+1 << '\n';
}
}
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
2644 KB |
Output is correct |
2 |
Incorrect |
2 ms |
2688 KB |
Wrong number of edges |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
6 ms |
3284 KB |
Output is correct |
2 |
Incorrect |
6 ms |
3336 KB |
Wrong number of edges |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
147 ms |
8504 KB |
Output is correct |
2 |
Incorrect |
144 ms |
8480 KB |
Wrong number of edges |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
268 ms |
13648 KB |
Output is correct |
2 |
Incorrect |
299 ms |
15184 KB |
Wrong number of edges |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
436 ms |
21956 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
638 ms |
32180 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
1046 ms |
46088 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
1519 ms |
59080 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
1749 ms |
65536 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
2068 ms |
65536 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |