5330 | 2023. 04. 25 22:29:09 | Catt | Vázsony vonatjegyet vásárol | cpp17 | Időlimit túllépés 55/100 | 1.567s | 156084 KiB |
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll maxN = 2e5 + 5;
vector<vector<pair<ll, ll> > > g;
vector<ll> dist;
vector<ll> p(maxN), s(maxN, 1);
vector<set<ll> > to(maxN);
vector<bool> volt(maxN, 0);
ll root(ll x) {
if(p[x] == x) return x;
return p[x] = root(p[x]);
}
void connect(ll x, ll y) {
x = root(x);
y = root(y);
if(x == y) return;
if(to[x].size() < to[y].size()) swap(x, y);
p[y] = x;
for(ll sz : to[y]) {
to[x].insert(root(sz));
}
s[x] += s[y];
}
void dijkstra(ll start) {
priority_queue<pair<ll, ll> > pq;
pq.push({0, start});
while (!pq.empty()) {
auto curr = pq.top();
pq.pop();
ll w = -curr.first, x = curr.second;
if(dist[x] != -1) continue;
dist[x] = w;
for(pair<ll, ll> sz : g[x]) {
if(dist[sz.first] != -1) continue;
pq.push({-w-sz.second, sz.first});
}
}
}
void dfs(int x) {
volt[x] = 1;
for(int sz : to[x]) {
if(volt[root(sz)]) continue;
dfs(root(sz));
}
}
int main() {
ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
ll n,m,a,b;
cin >> n >> m >> a >> b;
g.resize(n+1);
dist.resize(n+1, -1);
for(ll i = 0; i < m; i++) {
ll x,y,z;
cin >> x >> y >> z;
g[x].push_back({y, z});
g[y].push_back({x, z});
}
dijkstra(b);
for(int i = 1; i <= n; i++) p[i] = i;
for(ll i = 1; i <= n; i++) {
for(auto sz : g[i]) {
if(dist[sz.first] == dist[i]) {
connect(sz.first, i);
}
}
}
for(ll i = 1; i <= n; i++) {
for(auto sz : g[i]) {
if(dist[sz.first] < dist[i]) {
to[root(i)].insert(root(sz.first));
}
else if(dist[sz.first] > dist[i]) {
to[root(sz.first)].insert(root(i));
}
}
}
dfs(root(a));
vector<ll> be(n+1, 0);
for(ll i = 1; i <= n; i++) {
if(!volt[i] || root(i) != i) continue;
for(ll sz : to[i]) be[root(sz)]++;
}
vector<ll> tav(n+1, -1), parent(n+1, -1);
tav[root(a)] = 0;
queue<ll> sor;
sor.push(root(a));
while(!sor.empty()) {
ll cur = sor.front();
sor.pop();
for(ll sz : to[cur]) {
be[sz]--;
if(tav[sz] < tav[cur] + s[cur]) {
tav[sz] = tav[cur] + s[cur];
parent[sz] = cur;
}
if(be[sz] == 0) {
sor.push(sz);
}
}
}
set<ll> mo = {root(b)};
ll cur = root(b);
while(cur != root(a)) {
cur = parent[cur];
mo.insert(root(cur));
}
vector<ll> ki;
for(ll i = 1; i <= n; i++) {
if(mo.find(root(i)) != mo.end()) ki.push_back(i);
}
cout << ki.size() << "\n";
for(ll sz : ki) cout << sz << ' ';
return 0;
}
Részfeladat | Összpont | Teszt | Verdikt | Idő | Memória | ||
---|---|---|---|---|---|---|---|
subtask1 | 0/0 | ||||||
1 | Elfogadva | 14ms | 26868 KiB | ||||
2 | Elfogadva | 201ms | 59660 KiB | ||||
subtask2 | 20/20 | ||||||
3 | Elfogadva | 87ms | 43160 KiB | ||||
4 | Elfogadva | 759ms | 119800 KiB | ||||
5 | Elfogadva | 551ms | 99492 KiB | ||||
6 | Elfogadva | 379ms | 82336 KiB | ||||
7 | Elfogadva | 556ms | 97800 KiB | ||||
8 | Elfogadva | 368ms | 80784 KiB | ||||
9 | Elfogadva | 1.049s | 145388 KiB | ||||
subtask3 | 15/15 | ||||||
10 | Elfogadva | 280ms | 77448 KiB | ||||
11 | Elfogadva | 29ms | 31676 KiB | ||||
12 | Elfogadva | 25ms | 31580 KiB | ||||
13 | Elfogadva | 64ms | 40452 KiB | ||||
14 | Elfogadva | 123ms | 55724 KiB | ||||
subtask4 | 20/20 | ||||||
15 | Elfogadva | 92ms | 49216 KiB | ||||
16 | Elfogadva | 250ms | 63476 KiB | ||||
17 | Elfogadva | 63ms | 45284 KiB | ||||
18 | Elfogadva | 97ms | 55640 KiB | ||||
19 | Elfogadva | 50ms | 40116 KiB | ||||
20 | Elfogadva | 94ms | 48172 KiB | ||||
subtask5 | 0/45 | ||||||
21 | Elfogadva | 12ms | 29152 KiB | ||||
22 | Időlimit túllépés | 1.567s | 96692 KiB | ||||
23 | Elfogadva | 90ms | 43384 KiB | ||||
24 | Elfogadva | 397ms | 83504 KiB | ||||
25 | Elfogadva | 312ms | 73740 KiB | ||||
26 | Elfogadva | 587ms | 98408 KiB | ||||
27 | Elfogadva | 305ms | 75448 KiB | ||||
28 | Elfogadva | 1.2s | 156084 KiB | ||||
29 | Elfogadva | 197ms | 61144 KiB | ||||
30 | Elfogadva | 1.095s | 132140 KiB | ||||
31 | Elfogadva | 303ms | 65840 KiB | ||||
32 | Elfogadva | 85ms | 42608 KiB | ||||
33 | Elfogadva | 382ms | 74516 KiB | ||||
34 | Elfogadva | 321ms | 67788 KiB | ||||
35 | Elfogadva | 321ms | 67776 KiB | ||||
36 | Elfogadva | 301ms | 67768 KiB | ||||
37 | Elfogadva | 326ms | 67772 KiB |