#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MAXN 100005
#define MAXM 500005
#define FOR(i, a, b) for(ll i = a; i <= b; i++)
#define f first
#define s second
ll n, m, w[MAXN], d[MAXM];
set<ll> adj[MAXN];
pair<ll, pair<ll, ll>> e[MAXN];
bool v[MAXM];
map<pair<ll, ll>, ll> eid;
int main(){
cin >> n >> m;
FOR(i, 1, n) cin >> w[i];
FOR(i, 1, m){
e[i].f = 0;
cin >> e[i].s.f >> e[i].s.s;
adj[e[i].s.f].insert(e[i].s.s), adj[e[i].s.s].insert(e[i].s.f);
eid.insert({{min(e[i].s.f, e[i].s.s), max(e[i].s.f, e[i].s.s)}, i});
}
/*priority_queue<pair<ll, ll>> pq;
FOR(i, 1, m) {
v[i] = false;
e[i].f = adj[e[i].s.f].size() + adj[e[i].s.s].size() - 2;
//cout << "FOR EDGE " << i << " WE HAVE " << e[i].f << " CT " << endl;
for(auto j : adj[e[i].s.f]){
if(adj[j].size() == 2 && adj[e[i].s.s].find(j) != adj[e[i].s.s].end()){
e[i].f -= 2;
}
}
if(adj[e[i].s.f].size() == 1 || adj[e[i].s.s].size() == 1){
pq.push({1, i});
}else if(e[i].f == 0){
pq.push({0, i});
}
}*/
/*while(pq.size()){
//cout << pq.top().f << " ~ " << pq.top().s << " ==> " << e[pq.top().s].f << endl;
auto pqi = pq.top(); pq.pop();
if(v[pqi.s]) continue;
v[pqi.s] = true;
if(pqi.f == 0){
ll s = 0;
for(ll i2 : adj[e[pqi.s].s.f]) s += w[i2];
for(ll i2 : adj[e[pqi.s].s.s]) s += w[i2];
d[pqi.s] = w[e[pqi.s].s.f] + w[e[pqi.s].s.s] - s;
}else if(adj[e[pqi.s].s.f].size() == 1){
d[pqi.s] = w[e[pqi.s].s.f] * 2;
}else{
d[pqi.s] = w[e[pqi.s].s.s] * 2;
}
adj[e[pqi.s].s.f].erase(e[pqi.s].s.s);
adj[e[pqi.s].s.s].erase(e[pqi.s].s.f);
w[e[pqi.s].s.f] -= d[pqi.s] / 2;
w[e[pqi.s].s.s] -= d[pqi.s] / 2;
if(adj[e[pqi.s].s.f].size() == 2){
ll a = *(adj[e[pqi.s].s.f].begin());
ll b = *(++adj[e[pqi.s].s.f].begin());
if(eid.find({min(a, b), max(a, b)}) != eid.end()){
e[eid[{min(a, b), max(a, b)}]].f -= 2;
if(!v[eid[{min(a, b), max(a, b)}]] && e[eid[{min(a, b), max(a, b)}]].f == 0){
pq.push({0, eid[{min(a, b), max(a, b)}]});
}
}
}else if(adj[e[pqi.s].s.f].size() == 1){
ll a = *(adj[e[pqi.s].s.f].begin());
if(!v[eid[{min(a, e[pqi.s].s.f), max(a, e[pqi.s].s.f)}]]){
pq.push({1, eid[{min(a, e[pqi.s].s.f), max(a, e[pqi.s].s.f)}]});
}
}
if(adj[e[pqi.s].s.s].size() == 2){
ll a = *(adj[e[pqi.s].s.s].begin());
ll b = *(++adj[e[pqi.s].s.s].begin());
if(eid.find({min(a, b), max(a, b)}) != eid.end()){
e[eid[{min(a, b), max(a, b)}]].f -= 2;
if(!v[eid[{min(a, b), max(a, b)}]] && e[eid[{min(a, b), max(a, b)}]].f == 0){
pq.push({0, eid[{min(a, b), max(a, b)}]});
}
}
}else if(adj[e[pqi.s].s.s].size() == 1){
ll a = *(adj[e[pqi.s].s.s].begin());
if(!v[eid[{min(a, e[pqi.s].s.s), max(a, e[pqi.s].s.s)}]]){
pq.push({1, eid[{min(a, e[pqi.s].s.s), max(a, e[pqi.s].s.s)}]});
}
}
}
FOR(i, 1, m) if(!v[i]){
cout << 0 << endl;
return 0;
}
FOR(i, 1, m) cout << d[i] << endl;*/
}
