| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 197093 | quocnguyen1012 | Commuter Pass (JOI18_commuter_pass) | C++14 | 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.
clude <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<ll, int>
#define ull unsigned ll
#define f first
#define s second
#define FOR(i,a,b) for (int i=(a); i<(b); ++i)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) for (int i=(n-1); i>=0; --i)
#define REP1(i,n) FOR(i,1,n+1)
#define ALL(x) x.begin(),x.end()
#define SZ(x) (int)x.size()
#define SQ(x) (x)*(x)
#define MN(a,b) a = min(a,(__typeof__(a))(b))
#define MX(a,b) a = max(a,(__typeof__(a))(b))
#define pb push_back
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()), c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
#ifdef BALBIT
#define IOS()
#define bug(...) fprintf(stderr,"#%d (%s) = ",__LINE__,#__VA_ARGS__),_do(__VA_ARGS__);
template<typename T> void _do(T &&x){cerr<<x<<endl;}
template<typename T, typename ...S> void _do(T &&x, S &&...y){cerr<<x<<", ";_do(y...);}
#else
#define IOS() ios_base::sync_with_stdio(0);cin.tie(0);
#define endl '\n'
#define bug(...)
#endif
const int iinf = 1<<29;
const ll inf = 1ll<<60;
const ll mod = 1e9+7;
void GG(){cout<<"-1\n"; exit(0);}
ll mpow(ll a, ll n, ll mo = mod){ // a^n % mod
ll re=1;
while (n>0){
if (n&1) re = re*a %mo;
a = a*a %mo;
n>>=1;
}
return re;
}
ll inv (ll b, ll mo = mod){
if (b==1) return b;
return (mo-mo/b) * inv(mo%b) % mo;
}
const int maxn = 1e5+5;
vector<pii> g[maxn]; // to, weight. 1-based
ll ds[maxn], dt[maxn], du[maxn], dv[maxn];
void dij(ll d[], int S){
priority_queue<pii, vector<pii>, greater<pii> > pq; // Distance, node
fill(d, d+maxn, inf);
d[S]=0; pq.push({0,S});
while (!pq.empty()) {
ll w = pq.top().f, v = pq.top().s;
pq.pop();
if (w != d[v]) {
continue;
}
for (pii &e : g[v]) {
if (d[e.f] > d[v] + e.s) {
d[e.f] = d[v] + e.s;
pq.push({d[e.f],e.f});
}
}
}
}
bool B[maxn]; // black
ll mnu[maxn]; // Min distance to u walking on s-t shortest path
signed main(){
IOS();
int n, m; cin>>n>>m;
int s,t,u,v;
cin>>s>>t>>u>>v;
REP(i,m) {
int a, b, c; cin>>a>>b>>c;
g[a].pb({b,c});
g[b].pb({a,c});
}
dij(ds,s);
REP1(i,n) {
bug(i, ds[i]);
}
dij(dt,t);
dij(dv,v);
dij(du,u);
ll re = inf;
ll tg = ds[t]; assert(tg == dt[s]);
{
vector<int> q;
fill(mnu, mnu+maxn, inf);
static int seen[maxn];
seen[s]=1;
REP1(i,n) q.pb(i);
sort(ALL(q), [](int a, int b){return ds[a]<ds[b];});
REP(i,n) {
int at = q[i];
MN(mnu[at], du[at]);
for (pii &e : g[at]) {
int to = e.f;
if (ds[at] + e.s + dt[to] == ds[t]) {
MN(mnu[to], mnu[at]);
}
}
bug(at,mnu[at],dv[at]);
MN(re, mnu[at] + dv[at]);
}
}
cout<<min(re, du[v])<<endl;
}