#include <bits/stdc++.h>
#define task "P"
#define all(v) (v).begin(), (v).end()
#define rep(i, l, r) for (int i = (l); i <= (r); ++i)
#define Rep(i, r, l) for (int i = (r); i >= (l); --i)
#define DB(X) { cerr << #X << " = " << (X) << '\n'; }
#define DB1(A, _) { cerr << #A << "[" << _ << "] = " << (A[_]) << '\n'; }
#define DB2(A, _, __) { cerr << #A << "[" << _ << "][" << __ << "] = " << (A[_][__]) << '\n'; }
#define DB3(A, _, __, ___) { cerr << #A << "[" << _ << "][" << __ << "][" << ___ << "] = " << (A[_][__][___]) << '\n'; }
#define PR(A, l, r) { cerr << '\n'; rep(_, l, r) DB1(A, _); cerr << '\n';}
#define SZ(x) ((int)(x).size())
#define pb push_back
#define eb emplace_back
#define pf push_front
#define F first
#define S second
#define by(x) [](const auto& a, const auto& b) { return a.x < b.x; } // sort(arr, arr + N, by(a));
#define next ___next
#define prev ___prev
#define y1 ___y1
#define left ___left
#define right ___right
#define y0 ___y0
#define div ___div
#define j0 ___j0
#define jn ___jn
using ll = long long;
using ld = long double;
using ull = unsigned long long;
using namespace std;
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vl;
const int N = 1e5 + 2;
int n, m, c[N], dep[N], deg[N], ans[5 * N];
vii g[N];
bool dfs(int u, int p)
{
dep[u] = dep[p] + 1;
for (ii v : g[u]) if (v.F != p && dep[v.F] && (dep[u] - dep[v.F]) % 2 == 1) return 1;
for (ii v : g[u]) if (v.F != p && !dep[v.F] && dfs(v.F, u)) return 1;
return 0;
}
int main()
{
#ifdef HynDuf
freopen(task".in", "r", stdin);
//freopen(task".out", "w", stdout);
#else
ios_base::sync_with_stdio(false); cin.tie(nullptr);
#endif
cin >> n >> m;
rep(i, 1, n)
{
cin >> c[i];
c[i] <<= 1;
}
rep(i, 1, m)
{
int u, v;
cin >> u >> v;
g[u].eb(v, i);
g[v].eb(u, i);
deg[u]++;
deg[v]++;
}
if (dfs(1, 0))
{
cout << 0;
return 0;
}
vi st;
rep(i, 1, n) if (deg[i] == 1) st.pb(i);
while (!st.empty())
{
int u = st.back();
st.pop_back();
deg[u]--;
for (ii v : g[u]) if (deg[v.F] >= 1 && !ans[v.S])
{
ans[v.S] = c[u];
c[v.F] -= c[u];
if (--deg[v.F] == 1) st.pb(v.F);
}
}
rep(i, 1, n) if (deg[i] > 2)
{
cout << 0;
return 0;
}
rep(i, 1, n) if (deg[i] == 2)
{
int u = i, lst = 0, cnt = 0;
ll sum = 0;
while (1)
{
for (ii v : g[u]) if (deg[v.F] == 2 && v.F != lst)
{
cnt++;
if (cnt & 1) sum += c[u];
else sum -= c[u];
lst = u;
u = v.F;
break;
}
if (u == i) break;
}
ll lstc = sum;
u = i, lst = 0;
while (1)
{
for (ii v : g[u]) if (deg[v.F] == 2 && v.F != lst)
{
ans[v.S] = c[u] - lstc;
lstc = ans[v.S];
lst = u;
u = v.F;
break;
}
if (u == i) break;
}
break;
}
rep(i, 1, m) cout << ans[i] << '\n';
return 0;
}
