| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 379407 |
2021-03-18T07:09:48 Z |
Return_0 |
Pipes (CEOI15_pipes) |
C++17 |
|
1231 ms |
44980 KB |
#pragma GCC optimize("Ofast,unroll-loops")
// #pragma comment(linker, "/stack:200000000")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma,tune=native")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef int ll;
typedef long double ld;
typedef pair <ll, ll> pll;
#ifdef SINA
#define dbg(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1> void __f(const char* name, Arg1&& arg1) { cout << name << " : " << arg1 << std::endl; }
template <typename Arg1, typename... Args> void __f (const char* names, Arg1&& arg1, Args&&... args) {
const char* comma = strchr(names + 1, ',');cout.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...); }
#define dbg2(x, j, n) cout<< #x << " : "; output((j), (n), x, 1); cout.flush();
#else
#define dbg(...) 0
#define dbg2(x, j, n) 0
#endif
#define SZ(x) ((ll)((x).size()))
#define File(s, t) freopen(s ".txt", "r", stdin); freopen(t ".txt", "w", stdout);
#define input(j, n, a) for (int _i = (j); _i < (n)+(j); _i++) cin>> a[_i];
#define output(j, n, a, t) for (int _i = (j); _i < (n)+(j); _i++) cout<< a[_i] << (((t) && _i != (n)+(j)-1)? ' ' : '\n');
#define kill(x) return cout<< (x) << endl, 0
#define cl const ll
#define fr first
#define sc second
#define lc (v << 1)
#define rc (lc | 1)
#define mid ((l + r) >> 1)
#define All(x) (x).begin(), (x).end()
cl inf = sizeof(ll) == 4 ? (1e9 + 10) : (3e18), mod = 1e9 + 7, MOD = 998244353;
template <class A,class B> ostream& operator << (ostream& out,const pair<A,B>&a){return out<<'('<<a.first<<", "<<a.second<<')';}
template <class A> ostream& operator << (ostream& out, const vector<A> &a) {
out<< '['; for (int i = -1; ++i < ll(a.size());) out<< a[i] << (i + 1 < ll(a.size()) ? ", " : ""); return out<<']'; }
template <class T, typename _t = less <T> > using Tree = tree <T, null_type, _t, rb_tree_tag, tree_order_statistics_node_update>;
struct bridge_online {
vector <ll> par, dsu_2ecc, dsu_cc, dsu_cc_size;
ll bridges, lca_iteration;
vector <ll> last_visit;
set <pll> st;
void init(ll n) {
par.resize(n);
dsu_2ecc.resize(n);
dsu_cc.resize(n);
dsu_cc_size.resize(n);
lca_iteration = 0;
last_visit.assign(n, 0);
for (ll i = 0; i < n; ++i) {
dsu_2ecc[i] = i;
dsu_cc[i] = i;
dsu_cc_size[i] = 1;
par[i] = -1;
}
bridges = 0;
}
ll find_2ecc (ll v) {
if (v == -1) return -1;
return dsu_2ecc[v] == v ? v : dsu_2ecc[v] = find_2ecc(dsu_2ecc[v]);
}
ll find_cc(ll v) {
v = find_2ecc(v);
return dsu_cc[v] == v ? v : dsu_cc[v] = find_cc(dsu_cc[v]);
}
void make_root(ll v) {
v = find_2ecc(v);
ll root = v;
ll child = -1;
while (v != -1) {
ll p = find_2ecc(par[v]);
par[v] = child;
dsu_cc[v] = root;
child = v;
v = p;
}
dsu_cc_size[root] = dsu_cc_size[child];
}
void merge_path (ll a, ll b) {
++lca_iteration;
vector<ll> path_a, path_b;
ll lca = -1;
while (lca == -1) {
if (a != -1) {
a = find_2ecc(a);
path_a.push_back(a);
if (last_visit[a] == lca_iteration){
lca = a;
break;
}
last_visit[a] = lca_iteration;
a = par[a];
}
if (b != -1) {
b = find_2ecc(b);
path_b.push_back(b);
if (last_visit[b] == lca_iteration){
lca = b;
break;
}
last_visit[b] = lca_iteration;
b = par[b];
}
}
for (ll i = 0; i < SZ(path_a); i++) {
dsu_2ecc[path_a[i]] = lca;
if (path_a[i] == lca) break;
--bridges;
if (path_a[i] < path_a[i + 1]) st.erase({path_a[i], path_a[i + 1]});
else st.erase({path_a[i + 1], path_a[i]});
}
for (ll i = 0; i < SZ(path_b); i++) {
dsu_2ecc[path_b[i]] = lca;
if (path_b[i] == lca) break;
--bridges;
if (path_b[i] < path_b[i + 1]) st.erase({path_b[i], path_b[i + 1]});
else st.erase({path_b[i + 1], path_b[i]});
}
}
void add_edge(ll a, ll b) {
a = find_2ecc(a);
b = find_2ecc(b);
if (a == b) return;
ll ca = find_cc(a);
ll cb = find_cc(b);
if (ca != cb) {
++bridges;
if (a < b) st.insert({a, b});
else st.insert({b, a});
if (dsu_cc_size[ca] > dsu_cc_size[cb]) {
swap(a, b);
swap(ca, cb);
}
make_root(a);
par[a] = dsu_cc[a] = b;
dsu_cc_size[cb] += dsu_cc_size[a];
} else {
merge_path(a, b);
}
}
} ds;
int main ()
{
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
ll n, m;
cin>> n >> m;
ds.init(n);
for (ll i = 0, v, u; i < m; i++) {
cin>> v >> u;
ds.add_edge(--v, --u);
}
for (auto &x : ds.st) cout<< x.fr + 1 << ' ' << x.sc + 1 << '\n';
cerr<< "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
return 0;
}
/*
*/
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Wrong number of edges |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
7 ms |
748 KB |
Wrong number of edges |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
110 ms |
6124 KB |
Wrong number of edges |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
197 ms |
10476 KB |
Wrong number of edges |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
307 ms |
17644 KB |
Memory limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
427 ms |
7248 KB |
Wrong number of edges |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
661 ms |
7708 KB |
Wrong number of edges |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
865 ms |
20260 KB |
Memory limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1123 ms |
31852 KB |
Memory limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1231 ms |
44980 KB |
Memory limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
