#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define ertunt return
int main() {
ll n, m;
cin >> n >> m;
ll s, t, l, k;
cin >> s >> t >> l >> k;
vector<vector<pair<ll, ll>>> v(n + 1);
for (ll i = 0; i < m; i++) {
ll a, b, w;
cin >> a >> b >> w;
v[a].pb({b, w});
v[b].pb({a, w});
}
vector<ll> distt(n + 1, 1e19), dists(n + 1, 1e19);
dists[s] = 0;
distt[t] = 0;
set<pair<ll, ll>> pq;
pq.insert({0, s});
while (!pq.empty()) {
auto p = *pq.begin();
pq.erase(pq.begin());
for (auto [x, y] : v[p.ss]) {
if (dists[x] > dists[p.ss] + y) {
pq.erase({dists[x], x});
dists[x] = dists[p.ss] + y;
pq.insert({dists[x], x});
}
}
}
pq.insert({0, t});
while (!pq.empty()) {
auto p = *pq.begin();
pq.erase(pq.begin());
for (auto [x, y] : v[p.ss]) {
if (distt[x] > distt[p.ss] + y) {
pq.erase({distt[x], x});
distt[x] = distt[p.ss] + y;
pq.insert({distt[x], x});
}
}
}
if (distt[s] <= k) {
cout << n * (n - 1) / 2;
ertunt 0;
}
ll ans = 0;
vector<ll>L,R;
for(ll i = 1; i <= n; i++){
L.pb(dists[i]);
R.pb(distt[i]);
}
sort(all(L));
sort(all(R));
for(ll i = 1; i <= n; i++){
ll nm = upper_bound(all(R),k-l-L[i-1])- R.begin();
ans+=nm;
}
cout << ans << '\n';
}
Compilation message (stderr)
Main.cpp: In function 'int main()':
Main.cpp:21:29: warning: overflow in conversion from 'double' to 'std::vector<long long int>::value_type' {aka 'long long int'} changes value from '1.0e+19' to '9223372036854775807' [-Woverflow]
21 | vector<ll> distt(n + 1, 1e19), dists(n + 1, 1e19);
| ^~~~
Main.cpp:21:49: warning: overflow in conversion from 'double' to 'std::vector<long long int>::value_type' {aka 'long long int'} changes value from '1.0e+19' to '9223372036854775807' [-Woverflow]
21 | vector<ll> distt(n + 1, 1e19), dists(n + 1, 1e19);
| ^~~~
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |