#include <bits/stdc++.h>
#define pb push_back
#define lint long long int
using namespace std;
double solve(int n, int m, int k, int h, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) {
vector<vector<pair<int, int>>> edge(n);
for (int i = 0; i < m; i ++) {
edge[x[i]].pb({y[i], c[i]});
}
priority_queue<pair<int, int>> pq;
vector<bool> visited(n, false);
vector<int> dist(n, 1e9);
dist[0] = 0;
pq.push({0, 0});
while (!pq.empty()) {
int v = pq.top().second;
pq.pop();
if (visited[v]) continue;
visited[v] = true;
for (auto [vv, w] : edge[v]) {
if (dist[vv] > dist[v]+w) {
dist[vv] = dist[v]+w;
pq.push({-dist[vv], vv});
}
}
}
return (double)dist[h];
}
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