#include <iostream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <cstring>
#include <chrono>
#include <vector>
#include <map>
#include <random>
#include <set>
#include <algorithm>
#include <math.h>
#include <cstdio>
#include <stdio.h>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <deque>
#include <cassert>
#include <stack>
using namespace std;
#define mp make_pair
#define f first
#define se second
#define pb push_back
#define ppb pop_back
#define emb emplace_back
#define ll long long
#define ull unsigned long long
#define cntbit(x) __builtin_popcount(x)
#define endl '\n'
#define uset unordered_set
#define umap unordered_map
#define pii pair<int, int>
#define ld long double
#define pll pair<long long, long long>
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template <typename T> inline T range(T l, T r) {
return uniform_int_distribution<T>(l, r)(rng);
}
inline void setin(string s) {
freopen(s.c_str(), "r", stdin);
}
inline void setout(string s) {
freopen(s.c_str(), "w", stdout);
}
template <typename T> void Min(T &a, T b) {
a = min(a, b);
}
template <typename T> void Max(T &a, T b) {
a = max(a, b);
}
const int mod = 1e9 + 7;
const int inf = 2e9;
const int N = 5e5 + 15;
int n, m, a[N];
vector <int> g[N];
bool used[N];
set <pii> cur;
int deg[N], d[N];
int p[N], sz[N];
pii e[N];
int ans[N];
int find(int v) {
if(v == p[v])
return v;
return p[v] = find(p[v]);
}
void unio(int a, int b) {
a = find(a);
b = find(b);
if(a != b) {
if(sz[a] < sz[b])
swap(a, b);
p[b] = a;
sz[a] += sz[b];
}
}
inline int gt(int i, int v) {
return e[i].f == v ? e[i].se : e[i].f;
}
void precheck(int v, int p = -1) {
used[v] = true;
for(int ind : g[v]) {
int to = gt(ind, v);
if(to == p)
continue;
if(used[to]) {
if(d[to] > d[v])
continue;
if((d[v] - d[to]) & 1) {
cout << 0 << endl;
exit(0);
}
}
else {
d[to] = d[v] + 1;
precheck(to, v);
}
}
}
main() {
for(int i = 1; i <= n; ++i)
p[i] = i, sz[i] = 1;
ios_base::sync_with_stdio(0); cout.tie(0); cin.tie(0);
// setin("input.txt");
cin >> n >> m;
for(int i = 1; i <= n; ++i)
cin >> a[i];
for(int i = 1; i <= m; ++i) {
cin >> e[i].f >> e[i].se;
g[e[i].f].pb(i);
g[e[i].se].pb(i);
}
precheck(1);
for(int i = 1; i <= n; ++i)
deg[i] = g[i].size(), cur.insert({g[i].size(), i});
memset(used, 0, sizeof(used));
while(!cur.empty()) {
int v = cur.begin()->se;
if(deg[v] != 1)
break;
cur.erase(cur.begin());
used[v] = true;
for(int ind : g[v]) {
int to = gt(ind, v);
if(used[to])
a[v] -= ans[ind] / 2;
}
for(int ind : g[v]) {
int to = gt(ind, v);
if(used[to])
continue;
ans[ind] = 2 * a[v];
cur.erase({deg[to], to});
--deg[to];
cur.insert({deg[to], to});
}
}
for(int i = 1; i <= m; ++i)
cout << ans[i] << endl;
return 0;
}
