# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1008979 | makanhulia | Commuter Pass (JOI18_commuter_pass) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define endl '\n'
#define hitaf ios_base::sync_with_stdio(false); cin.tie(NULL);
#define fi first
#define se second
const ll MOD = 998244353;
const ll INF = 1e18;
ll n, m, s, t, u, V;
vector<pair<ll, ll>> adj[100005];
bool vis[100005];
int main(){
//hitaf
cin >> n >> m;
cin >> s >> t;
cin >> u >> V;
vector<ll> dist(n + 2, INF), dist2(n + 2, INF);
for(int i = 1; i <= m; i++){
ll x, y, w;
cin >> x >> y >> w;
adj[x].push_back({y, w});
adj[y].push_back({x,w});
}
priority_queue<pair<ll, ll>, vector<pair<ll, ll>>, greater<pair<ll, ll>>> pq;
pq.push({0, s});
dist[s] = 0;
while(!pq.empty()){
auto now = pq.top();
pq.pop();
if(dist[now.se] < now.fi) continue;
for(auto v: adj[now.se]){
if(dist[v.fi] < now.fi + v.se) continue;
dist[v.fi] = now.fi + v.se;
pq.push({dist[v.fi], v.fi});
}
}
set<pair<ll, ll>> st;
queue<ll> q;
q.push(t);
while(!q.empty()){
ll u = q.top();
q.pop();
if(vis[u]) continue;
for(auto v: adj[u]){
if(dist[v.fi] + v.se == dist[u]){
st.insert({v.fi, u});
vis[v.fi] = true;
q.push(v.fi);
}
}
}
priority_queue<pair<ll, ll>, vector<pair<ll, ll>>, greater<pair<ll, ll>>> pq2;
pq2.push({0, u});
while(!pq2.empty()){
auto now = pq2.top();
pq2.pop();
if(dist2[now.se] < now.fi) continue;
for(auto v: adj[now.se]){
ll w = v.se;
if(st.find({v.fi, now.se}) != st.end()) w = 0;
if(dist2[v.fi] < now.fi + w) continue;
dist2[v.fi] = now.fi + w;
pq2.push({dist2[v.fi], v.fi});
}
}
cout << dist2[V] << endl;
}
/*
7 1 2 9 0
*/