#include <bits/stdc++.h>
#define all(v) ((v).begin(),(v).end())
#define F first
#define S second
typedef long long ll;
#define pii pair<ll,double>
using namespace std;
const ll mod = 1e9 + 7;
const ll mxN = 4e6 + 5;
struct path{
ll i,k,fl;
double val;
};
bool operator<(path a,path b){
return a.val < b.val;
}
bool operator>(path a,path b){
return a.val > b.val;
}
double solve(int N, int M, int K, int H, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) {
vector<vector<pii>>v;
const int nsz = N + 3;
const int ksz = K + 3;
double dp[nsz][ksz][2];
bool vis[nsz] = {};
v.resize(N + 3);
for(int i = 0;i < M;i++){
v[x[i]].push_back({y[i],(double)c[i]});
v[y[i]].push_back({x[i],(double)c[i]});
}
for(int i = 0;i < N;i++){
for(int j = 0;j <= K;j++){
dp[i][j][0] = (double)1e18;
dp[i][j][1] = (double)1e18;
}
}
dp[H][0][0] = 0;
priority_queue<path,vector<path>,greater<path>>q;
q.push({H,0,0});
while(q.size()){
auto u = q.top();
vis[u.i] = 1;
q.pop();
if(dp[u.i][u.k][u.fl] < u.val) continue;
for(auto x : v[u.i]){
if(arr[u.i] == 0 || u.fl == 1){
if(dp[x.F][u.k][1] > u.val){
dp[x.F][u.k][1] = u.val;
q.push({x.F,u.k,1,dp[x.F][u.k][1]});
}
}
if(arr[u.i] == 2 && u.k < K){
if(dp[x.F][u.k + 1][0] > u.val + (x.S / (exp2(u.k + 1)))){
dp[x.F][u.k + 1][0] = u.val + (x.S / (exp2(u.k + 1)));
q.push({x.F,u.k + 1,u.fl,dp[x.F][u.k + 1][0]});
}
}
if(dp[x.F][u.k][0] > u.val + (x.S / (exp2(u.k)))){
dp[x.F][u.k][0] = u.val + (x.S / (exp2(u.k)));
q.push({x.F,u.k,u.fl,dp[x.F][u.k][0]});
}
}
}
double ans = (double)1e18;
for(int i = 0; i <= K;i++){
ans = min(ans,dp[0][i][0]);
ans = min(ans,dp[0][i][1]);
}
if(!vis[0]) return -1;
return ans;
}
int main() {
int T;
assert(1 == scanf("%d", &T));
while (T--){
int N,M,K,H;
assert(4 == scanf("%d %d %d\n%d", &N, &M, &K, &H));
vector<int> x(M);
vector<int> y(M);
vector<int> c(M);
vector<int> arr(N);
for (int i=0;i<N;i++)
assert(1 == scanf("%d", &arr[i]));
for (int i=0;i<M;i++)
assert(3 == scanf("%d %d %d", &x[i], &y[i], &c[i]));
printf("%.12lf\n", solve(N, M, K, H, x, y, c, arr));
}
}
Compilation message
/usr/bin/ld: /tmp/ccglZmr0.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccn8VhXX.o:cyberland.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
