#include<bits/stdc++.h>
#define rep(i, a, b) for(long long i=(a) ; i<=(b) ; ++i)
#define Task ""
using namespace std;
const long long N=1000005;
vector <long long > g[N];
long long deg[N], n, a[N], h[N], par[N][22], topo[N], cnt;
long long b[N];
void DFS(long long u) {
topo[++cnt]=u;
for(long long v:g[u]) {
if(v==par[u][0]) continue;
h[v]=h[u]+1;
b[v]*=b[u];
par[v][0]=u;
rep(i, 1, 19) par[v][i]=par[par[v][i-1]][i-1];
DFS(v);
}
}
long long LCA(long long u, long long v) {
if(h[u]<h[v]) swap(u, v);
long long delta=h[u]-h[v];
rep(i, 0, 19) {
if((delta>>i)&1) u=par[u][i];
}
if(u==v) return u;
for(long long i=19 ; i>=0 ; --i) {
if(par[u][i]!=par[v][i]) u=par[u][i], v=par[u][i];
}
return par[u][0];
}
void sub1() {
long long P=5e18, Q=1;
rep(i, 1, n) {
if(P>1ll*a[i]*Q) P=a[i], Q=1;
rep(j, i+1, n) {
long long cha=LCA(i, j);
long long num=h[i]+h[j]-h[cha]*2+1;
long long T=(b[i]/b[cha])*(b[j]/b[cha])*a[cha];
long long gcd=__gcd(T, num);
T/=gcd, num/=gcd;
if(P*num>T*Q) P=T, Q=num;
}
}
cout << P << '/' << Q;
}
long long polong longer;
vector<long long> M;
vector<long long> B;
bool bad(long long l1,long long l2,long long l3)
{
return (B[l3]-B[l1])*(M[l1]-M[l2])<=(B[l2]-B[l1])*(M[l1]-M[l3]);
}
void add(long long m,long long b)
{
M.push_back(m);
B.push_back(b);
while (M.size()>=3&&bad(M.size()-3,M.size()-2,M.size()-1))
{
M.erase(M.end()-2);
B.erase(B.end()-2);
}
}
long long query(long long x)
{
if (polong longer>=M.size())
polong longer=M.size()-1;
while (polong longer<M.size()-1&&
M[polong longer+1]*x+B[polong longer+1]>M[polong longer]*x+B[polong longer])
polong longer++;
return M[polong longer]*x+B[polong longer];
}
void sub2() {
long long P=5e18, Q=1;
add(1, 0);
b[0]=1;
rep(i, 1, n) {
long long u=topo[i];
long long M=query(i);
long long gcd=__gcd(M, b[u]);
long long T=b[u]/gcd;
M/=gcd;
if(P*M>Q*T) P=T, Q=M;
add(b[u], -1ll*i*b[u]);
}
cout << P << '/' << Q;
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//freopen(Task".inp", "r", stdin);
//freopen(Task".out", "w", stdout);
cin >> n;
long long mx=0;
rep(i, 2, n) {
long long u, v;
cin >> u >> v;
++deg[u], ++deg[v];
g[u].push_back(v);
g[v].push_back(u);
}
rep(i, 1, n) {
cin >> a[i], b[i]=a[i];
mx=max(mx, deg[i]);
}
DFS(1);
if(mx<=2) sub2();
else sub1();
return 0;
}
Compilation message
mag.cpp:51:18: error: expected initializer before 'longer'
long long polong longer;
^~~~~~
mag.cpp: In function 'long long int query(long long int)':
mag.cpp:72:6: error: 'polong' was not declared in this scope
if (polong longer>=M.size())
^~~~~~
mag.cpp:72:6: note: suggested alternative: 'ulong'
if (polong longer>=M.size())
^~~~~~
ulong
mag.cpp:72:13: error: expected ')' before 'longer'
if (polong longer>=M.size())
^~~~~~
mag.cpp:73:10: error: expected ';' before 'longer'
polong longer=M.size()-1;
^~~~~~
mag.cpp:74:9: error: 'polong' was not declared in this scope
while (polong longer<M.size()-1&&
^~~~~~
mag.cpp:74:9: note: suggested alternative: 'ulong'
while (polong longer<M.size()-1&&
^~~~~~
ulong
mag.cpp:74:16: error: expected ')' before 'longer'
while (polong longer<M.size()-1&&
^~~~~~
mag.cpp:74:16: error: 'longer' was not declared in this scope
mag.cpp:74:16: note: suggested alternative: 'long'
while (polong longer<M.size()-1&&
^~~~~~
long
mag.cpp:75:13: error: expected ']' before 'longer'
M[polong longer+1]*x+B[polong longer+1]>M[polong longer]*x+B[polong longer])
^~~~~~
mag.cpp:77:11: error: 'polong' was not declared in this scope
return M[polong longer]*x+B[polong longer];
^~~~~~
mag.cpp:77:11: note: suggested alternative: 'ulong'
return M[polong longer]*x+B[polong longer];
^~~~~~
ulong
mag.cpp:77:18: error: expected ']' before 'longer'
return M[polong longer]*x+B[polong longer];
^~~~~~
mag.cpp:77:18: error: expected ';' before 'longer'
mag.cpp:77:18: error: 'longer' was not declared in this scope
mag.cpp:77:18: note: suggested alternative: 'long'
return M[polong longer]*x+B[polong longer];
^~~~~~
long
