#include <vector>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <numeric>
#include <cstring>
#include <vector>
#include <string>
#include <climits>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <bitset>
#include <cassert>
#include <list>
using namespace std;
#define all(x) x.begin(), x.end()
#define rll(x) x.rbegin(), x.rend()
#define comp(x) x.erase(unique(all(x)), x.end())
#define MOD 1000000007
#define MOD2 998244353
#define debug(x) cout << #x<<" is "<<x<<"\n";
#define X first
#define Y second
#define DEB cout<<"[DEBUG]"
#define PAIR(a,b) "("<<a<<", "<<b<<")"
#define PRINT1(V) DEB<<#V<<endl; for(auto i : V)DEB<<i<<"\n"
#define PRINT2(V) DEB<<#V<<endl; for(auto [a,b] : V)DEB<<PAIR(a,b)<<"\n";
typedef long long ll;
typedef __int128_t lll;
typedef long double ld;
typedef pair<ll,ll> P;
typedef pair<ll,P> PP;
typedef pair<ld,ll> Pd;
vector<P> adj[202020];
ld dist[202020];
ll p[202020];
ll find(ll x){
if(p[x]<0)return x;
return p[x] = find(p[x]);
}
void merge(ll x, ll y){
x = find(x), y = find(y);
if(x==y)return;
p[y]=x;
}
double solve(int N, int M, int K, int H, std::vector<int> x, std::vector<int> y, std::vector<int> c, std::vector<int> arr) {
if(N==2)return (M==0 ? -1 : c[0]);
map<P,ll> mp;
for(int i = 0 ; i < M ; i++){
mp[P(min(x[i],y[i]), max(x[i],y[i]))] = c[i];
}
ld ret = 1e15;
if(mp.find({0,H}) != mp.end())ret = min<ld>(ret, mp[{0,H}]);
if(mp.find({0,2-H}) != mp.end() and mp.find({min(H,2-H), max(H,2-H)}) != mp.end()){
ret = min(ret, (ld)mp[{0,2-H}] / (arr[2-H]==2 ? 2.0 : 1.0) + mp[{min(H,2-H), max(H,2-H)}]);
}
if(ret==1e15)ret = -1;
return ret;
}
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));
std::vector<int> x(M);
std::vector<int> y(M);
std::vector<int> c(M);
std::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/cchXiJK2.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccixDY65.o:cyberland.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
