This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
typedef long long ll;
#define pb push_back
#define MS(x,y) memset((x),(y),sizeof((x)))
#define MN 1000000001
using namespace std;
const ll nsize = 100001;
ll n,m,q;
ll sajz[nsize];
vector<ll> pat[nsize];
ll vred[nsize];
bool custComp(ll a, ll b) {
if (sajz[a] == sajz[b]) return a < b;
return sajz[a] > sajz[b];
}
ll res = 1;
void dfs(ll pos, ll parent) {
ll bris = pat[pos].size()-1;
for (auto it:pat[pos]) {
if (it == parent) continue;
dfs(it,pos);
}
sort(pat[pos].begin(),pat[pos].end());
for (auto it2:pat[pos]) {
if (it2 == parent) continue;
auto it = sajz[it2];
if (sajz[pos]+it <= q) {
sajz[pos] += it;
bris--;
} else {
res += bris;
return;
}
}
}
int main()
{
#if LOCAL_DEBUG
fstream cin("in.txt");
#endif
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
ll zbir = 0;
cin>>n>>q;
m = n-1;
for (ll i = 0; i<n; i++) cin>>vred[i];
for (ll i = 0; i<n; i++) zbir += vred[i];
for (ll i = 0; i<m; i++) {
ll a,b;
cin>>a>>b;
a--; b--;
pat[a].pb(b);
pat[b].pb(a);
}
for (ll i = 0; i<n; i++) sajz[i] = vred[i];
dfs(0,-1);
if (zbir <= q) {
cout<<0<<endl;
return 0;
}
cout<<res<<endl;
}
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